Endocrine glands will... a. Produce their products through the holoc.pdf

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Endocrine glands will... a. Produce their products through the holocrine method b. Open into a body cavity c. Expel their contents through apoptosis d. Expel their products directly into the blood stream One distinct characteristic of muscle tissue is that it... a. Gets shorter b. Gets longer c. Swells up d. Transmits signals Sweat glands are a type of what? a. Holocrine exocrine glands b. Merocrine exocrine glands c. Apocrine endocrine glands d. Eccrine endocrine glands What is the function of connective tissue? a. Protection b. Absorption c. Support d. Contraction Which of the following is not connective tissue? a. Blood b. Fat c. Bone d. All the above are connective tissue What it the matrix of connective tissue? a. It is the network of fibers that help support connective tissue b. it is the living cells that support the connective tissue c. It is the non-living substance in which fibers and cells live d. A & C e. A & B Which of the following Solution 7. Endocrine glands will produce their product through Holocrine method. it involves the death of the cell and the content of the cell become secretory product. example- sebaceous gland act by this. as endocrine gland lack ducts the produt is released across cell membrane into interstitial space. 8. one distinct characteristic of muscle tissue is that gets shorter. when muscle tissue contracts and become shorter and thicker this cause movement. 9. sweat glands are a type of exocrine gland. it is of two types- a. Eccrine- it is found all over the body , its function is mainly cooling the body. b.Apocrine- it is mainly found inaxillae, nipple of breast, perianal area. in the junction of dermis and subcutaneous fat it is formed by coiled secretory portion. 10. the function of connective tissue is support. example- in haematopoetic and lymphatic tissue reticular fiber provides support..

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Tissue Definition Tissues are groups of cells that have a similar structure and act together to perform a specific function. The word tissue comes from a form of an old French verb meaning “to weave”. There are four different types of tissues in animals: connective, muscle, nervous, and epithelial. In plants, tissues are divided into three types: vascular, ground, and epidermal. Groups of tissues make up organs in the body such as the brain and heart. Types of Animal Tissues Connective Connective tissue connects or separates groups of other tissues. It is found in between all the other tissues and organs in the body. Connective tissue is made up of cells and ground substance, which is a gel that surrounds cells. Most connective tissue, except for lymph and blood, also contains fibers, which are long, narrow proteins. Fibers can be collagenous, which bind bones to tissues; elastic, which allow organs like the lungs to move; or reticular, which provide physical support to cells. Connective tissue also allows oxygen to diffuse from blood vessels into cells. About 1 in 10 people are have a disorder involving connective tissue. Some connective tissue disorders include sarcomas, Marfan syndrome, lupus, and scurvy, which is a Vitamin C deficiency that leads to fragile connective tissue. Muscle Muscle tissue comprises all the muscles in the body, and the specialized nature of the tissue is what allows muscles to contract. There are three types of muscle tissue: skeletal muscle, cardiac muscle, and smooth muscle. Skeletal muscle anchors tendons to bones and allows the body to move. Cardiac muscle is found in the heart and contracts to pump blood. Smooth muscle is found in the intestines, where it helps move food through the digestive tract, and it is also found in other organs like blood vessels, the uterus, and the bladder. Skeletal and cardiac muscles are striated; this means that they contain sarcomeres (a unit of muscle tissue) that are arranged in a uniform pattern. Smooth muscle does not have sarcomeres. Duchenne muscular dystrophy is an example of a muscle tissue disorder. It is an inherited disorder that causes muscles to atrophy over time. The muscles shorten as they atrophy, which can cause scoliosis and immobile joints. Individuals with the disorder are usually male because the gene responsible for it is found on the X chromosome (of which males have only one). Nervous Nervous tissue is found in the brain, spinal cord, and peripheral nerves, which are all parts of the nervous system. It is made up of neurons, which are nerve cells, and neuroglia, which are cells that help nerve impulses travel. Nervous tissue is grouped into four types: gray matter and white matter in the brain, and nerves and ganglia in the peripheral nervous system. The main difference between gray and white matter is that axons of the neurons in gray matter are unmyelinated, while white matter is myelinated. Myelin is a white, fatty substance that insulates neurons and

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Week Three Quiz NSCI/280 Version 5 1 University of Phoenix Material Week Three Quiz Chapter 6 Skeletal System: Bones and Bone Tissue 1. Important functions of the skeletal system include a. protection of the brain and soft organs. b. storage of water. c. production of Vitamin E. d. regulation of acid-base balance. e. integration of other systems. 2. Cartilage a. is composed of osteons. b. is surrounded by a membrane called the periosteum. c. contains chondrocytes located in lacunae. d. does not need nutrients and oxygen so it has no blood vessels. e. is well vascularized. 3. Collagen and calcium hydroxyapatite are the primary constituents of a. bone matrix. b. hyaline cartilage. c. fibrous cartilage. d. ligaments. e. blood. 4. The primary function of osteoblasts is to a. prevent osteocytes from forming. b. resorb bone along the epiphyseal plate. c. inhibit the growth of bone. d. stimulate bone growth. e. lay down bone matrix. 5. A cord of connective tissue that attaches muscle to bone is a a. ligament. b. periosteum. c. endosteum. d. tendon. e. muscle spindle. 6. A passageway connecting neighboring osteocytes in an osteon is a a. central canal. b. lamella. c. canaliculus. d. lacuna. e. osteocanal. 7. Which of the following is correctly matched? a. short bone - carpal bone b. long bone – vertebra c. irregular bone – femur d. flat bone - phalanges of the toes e. short bone – humerus 8. What is the area where marrow is located? a. epiphysis b. Sharpey's fibers c. growth plate d. medullary cavity e. endosteum 9. Which of the following events occurs last in intramembranous ossification? a. Osteoprogenitor cells become osteoblasts. b. A membrane of delicate collagen fibers develops. c. Cancellous bone is formed. d. Periosteum is formed. e. Many tiny trabeculae of woven bone develop. 10. Which of the following statements regarding calcium homeostasis is true? a. Parathyroid hormone inhibits osteoclast activity. b. When blood calcium levels are too low, osteoclast activity increases. c. Increased osteoblast activity increases blood calcium levels. d. Parathyroid hormone increases calcium loss from the kidney. e. Calcitonin elevates blood calcium levels. Chapter 7 Skeletal System: Gross Anatomy 1. Which of the following bones is part of the axial skeleton? a. rib b. radius c. clavicle d. scapula e. coax 2. Which of the following bones are paired? (select two answers) a. vomer b. temporal c. sphenoid d. mandible e. maxilla 3. Which of the following bones contains a sinus? a. Maxilla b. nasal bone c. occipital bone d. zygomatic bone e. temporal 4. Which of the following statements is true? a. The first cervical vertebra is called the axis. b. The spinal cord protects the vertebral column. c. Thoracic vertebrae have long, thin spinous processes. d. The sacral vertebrae are superior to the lumbar vertebrae. e. Lumbar vertebrae are generally smaller than thoracic vertebrae. 5.

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Introduction The term tissue is used to describe a group of cells found together in the body. Types of tissues 1. Epithelial tissue:] 2. Connective tissue: ] 3. Muscular tissue: ] 4. Nervous tissue: ] -Development of Tissues Tissues of the body develop from three primary germ layers: Ectoderm, Endoderm and Mesoderm. 1. Epithelial cell Epithelial tissue consists of cells arranged in continuous sheets, in either single or multiple layers. Closely packed and held tightly together. -General Features of Epithelial Cells: 1. Apical (free) surface 2. Lateral surfaces 3. Basal surface Basement membrane Basal lamina Reticular lamina -Classification of epithelial tissues Epithelial tissues are classified according to : Number of the cell layers formed 1. Simple epithelium (one layer) 2. Stratified epithelium(several layer) -The shape of the cells 1. Squamous (flat cell) 2. Cuboidal (cube like) 3. Columnar (rectangular) 4. Transitional (variable) - Glandular Epithelium and Glands There are main two types of glands 1. Endocrine Glands 2. Exocrine Glands -Structural Classification of Exocrine Glands 1. Simple gland 2. Compound gland -Functional Classification of 1. Exocrine Glands 2. Merocrine glands 3. Aprocrine glands 4. Holocrine glands 2. Connective Tissue -Functions of connective tissues -Classification of Connective Tissues Embryonic connective tissue Mesenchyme Mucous connective tissue Mature connective tissue Loose connective tissue Areolar connective tissue Adipose tissue Reticular connective tissue Dense connective tissue Dense regular connective tissue Dense irregular connective tissue Elastic connective tissue Cartilage Hyaline cartilage Fibrocartilage Elastic cartilage Bone tissue -Blood and Lymph --Characteristics of Connective Tissue 1. Extra cellular matrix 2. Fibers 3. Cells of various types Extracellular matrix of Connective Tissue -Connective Tissue Cells 1. Fibroblasts 2. Adipocytes (fat cells) 3. Mast cells 4. White blood cells 5. Macrophages 6. Plasma cells -Connective Tissue Extracellular Matrix; Ground substance and fibres make up the ECM. a. Ground substance -Complex combination of proteins and polysaccharides (hyaluronic acid, chondroitin sulphate dermatan sulphate and keratan sulphate). b. Fibres -Collagen fibers -Elastic fibers -Reticular fibers 3. Muscular Tissue -Skeletal muscle tissue (Attached to bone by tendons) -Cardiac muscle tissue (Heart wall) -Smooth muscle tissue (Iris of eyes, walls of hollow internal structures such as blood vessels, airways of lungs, stomach, intestine, gall bladder, urinary bladder and uterus) --Consists of elongated cells called muscle fibers or myocytes for contraction. --Cells use ATP to generate force. 4. Nervous Tissue -Neurons or nerve cells -Neuroglia --Exhibit sensitivity to various types of stimuli, converts them into nerve impulses (action potentials) and conducts nerve impulses to other neurons.

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Simple squamous epithelium is structured to best provide: A. Diffusion of substances across the membrane B. Protection/withstanding wear and tear C. Secretion and absorption D. Receptor Mediated Endocytosis E. Ability to stretch without tearing Which of the following cells is not a resident cell found in peripheral Connective Tissue? A. Oligodendrocytes B. Macrophages C. Mast cells D. Phagocytes E. Fibroblasts Which of the following is NOT true of the Na+/K+ pump? A. It is an active transport mechanism requiring ATP expenditure. B. It pumps Na+ out of the cell and K+ in to the cell at a rate of 2 Na+ for every 3 K+. C. It contributes to a cell\'s resting membrane potential D. It helps to establish an overall negative intracellular charge. E. all of the above Which of the following is NOT correct regarding cardiac muscle tissue? A. This tissue is highly mitotic. B. It is contain of actin and myosin proteins. C. It is considered involuntary muscle tissue. D. It is a type of striated muscle tissue. E. None of the above are correct Blood in the venous system is returning to the ________side of the heart to be pumped to the _____________. A. left, lungs B. right, lungs C. D. right, body A. Diffusion of substances across the membrane B. Protection/withstanding wear and tear C. Secretion and absorption D. Receptor Mediated Endocytosis E. Ability to stretch without tearing Solution 1. A. Diffusion of substances across the membrane. simple squamous epithelium is a single layer of flat cells in contact with the basal lamina (one of the two layers of the basement membrane) of the epithelium.This type of epithelium is often permeable and occurs where small molecules pass quickly through membranes via filtration or diffusion. Simple squamous epithelia are found in capillaries, alveoli, glomeruli, and other tissues where rapid diffusion is required. It is also called pavement epithelium due to its tile-like appearance. This epithelium is associated with filtration and diffusion.This tissue is extremely thin, and forms a delicate lining. 2. A.Oligodendrocytes . These cells occur in nervous tissue. 3. B. It pumps Na+ out of the cell and K+ in to the cell at a rate of 2 Na+ for every 3 K+. Na-K pump pumps 3 Na+ out in exchange of 2 K+ ions. 4. A. This tissue is highly mitotic. 5. B. right, lungs. Venous blood returns to right side of heart (right auricle) and is pumped to lungs for oxygrnation..

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By:M. Thiru murugan Unit – II: The cell: Structure, reproduction and function Tissues including membranes and glands : types, structure and functions Body cavities and their contents Cell Cell is the basic Structural and functional unit Unicellular Organisms - made up of only one cell Multicellular Organisms - made up of more than one cell. Cells vary in shape & size Types of Cells: Based on cellular structure, there are two types of cells: Prokaryotes - Prokaryotic cells have no nucleus. Eukaryotes - characterized by a true nucleus. Structures of cell: It consist of 3 parts: Cell membrane outer boundary of cell Nucleus - control center Cytoplasm material between cell membrane & nucleus Cell (plasma) membrane: Cell structure that regulates passage of materials between cell & its environment; aid in protection & support of cell Cell wall – cell structure that surrounds cell membrane 2. Nucleus Nucleus - organelle that controls the cell’s activities & contains DNA Parts of nucleus: Nuclear envelope - 2 membranes that surround nucleus of a cell Nucleolus - cell structure that contains RNA & proteins; where ribosomes are made Chromosomes - threadlike structure in a cell that contains genetic information that is passed on from one generation of cells to the next Chromatin – long, tangled strands of DNA 3. Cytoplasm Cytoplasm – (jelly-like) area between nucleus & cell membrane of a cell Surrounds organelles Organelle – tiny cell structure that performs a specialized function within the cell Cell Organelle and its Functions: Nucleolus: The nucleolus is the site of ribosome synthesis. Also, it is involved in controlling cellular activities and cellular reproduction Nuclear membrane: The nuclear membrane protects the nucleus by forming a boundary between the nucleus and other cell organelles. Endoplasmic reticulum: The endoplasmic reticulum is involved in the transportation of substances throughout the cell. It plays a primary role in the metabolism of carbohydrates, synthesis of lipids, steroids and proteins. Golgi Bodies: Golgi bodies are called the cell’s post office as it is involved in the transportation of materials within the cell Ribosome: Ribosomes are the protein synthesizers of the cell Mitochondria: The mitochondrion is called “the powerhouse of the cell.” It is called so because it produces ATP – the cell’s energy Lysosomes: Lysosomes protect the cell by engulfing the foreign bodies entering the cell and helps in cell renewal. Therefore, it is known as the cell’s suicide bags Chloroplast: Chloroplasts are the primary organelles for photosynthesis. It contains the pigment chlorophyll Vacuoles: Vacuoles stores food, water, and other waste materials in the cell Reproduction Cell division: Cells need to divide for a number of reasons, including the growth of an organism and to fill gaps left by dead and destroyed cells after an injury, for instance. There are two types of cell division: Mitosis Meiosis Mitosis: Mitosis

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Which of the following statements is true about the interaction of electromagnetic radiation with matter? 1) Photoelectric absorption involves the interaction of a photon with the nucleus of an atom. 2) Rayleigh scattering involves an inelastic collision of a photon with an outer-shell electron with negligible binding energy, after which that electron is ejected from the atom. 3) The main phenomena associated with X-ray imaging are Rayleigh scattering at low photon energies and pair production at high photon energies. 4) The main phenomena associated with X-ray imaging are photoelectric absorption at low photon energies and Compton scattering at high photon energies. 5)None of these statements are true. Please explain why. Solution 1) The statement is true. The photons with atom particles are by chance, a given photon has a finite probability of passing completely through the medium it is traversing. The probability that a photon will pass completely through a medium depends on numerous factors including the photon’s energy and the medium’s composition and thickness. The more densely packed a medium’s atoms, the more likely the photon will encounter an atomic particle. 2)False The photons doest not excite the atom when it interacts with the one or more bounded electrons. The energy is same at the end of the process, that is energy of photon is equal to the interacting atom. Therefore, it is elastic scattering. 3) This statement is true. Rayliegh scattering involves in deflection of the incoming particle, but not absorption.hence it occurs for low photon energies. Whereas the pair productionrequires very high energy as the photon interacts with the electron or nucleaus and forms postiron electron pairs. The photon must have atleast 1.022 MeV energy to interact. 4) The statement is false. As the photoelectric absorption involves in absorption of photons by atoms which have considerably high energy as discussed in first point. So statements 1 and 3 are true..

Which of the following statements is true about the interaction of e.pdf

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Which of the following identifies an underlying principle of the communicative or “Acquisition vs. Learning” approaches to the instruction of English Language Learners? Select one: a. Students should follow a step-by-step progression on English instruction from simpler to more difficult tasks. b. Students develop skills in English by mastering the written grammar of the language c. Students should have repeated exposure to accurate models of oral English in the formal register d. Students develop English language skills by figuring out the meaning of English words in interactions with other people Solution d. Students develop English language skills by figuring out the meaning of English words in interactions with other people because communication principle involves classroom interaction and aqusition vs learning means to learn the few words and acquire them one by one by knowing their meanings and gradually forming the sentences as a whole with these words..

Which of the following identifies an underlying principle of the com.pdf

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