epithelium covers body surfaces, lines body cavities and constitute glands.so it is important to know about epithelium in detail to deal with tissue of different type and origin.
epithelium covers body surfaces, lines body cavities and constitute glands.so it is important to know about epithelium in detail to deal with tissue of different type and origin.
The presentation include general definition of bone and it's functions. Also, describe the chemical composition of bone and then specifically describe alveolar process.
. Definition of Tissues Biological tissue is a collection of interconnected cells that perform a similar function within an organism. In other words, it is a group of cells working together mainly inside an organ.
3. Classification of Tissues Human body is composed of 4 basic types of tissue: •Epithelial tissue •Connective tissue •Muscular tissue •Nervous tissue
4. Origin of Tissue A fertilized egg divides to produce 3 primary germ cell layers. These layers differentiate to form the tissues of the body.
5. Epithelial Tissue Epithelial cells cover or line all body surfaces, cavities and tubes. So, These are called covering epithelia. Epithelial cells form the functional units of secretory glands. So, These are called glandular epithelia.
Hello readers,
This PPT is about the chapter:- Tissue which is in science class IX
Question Are In The Book Of NCERT
I Hope this will help You...
Thanks....
The presentation include general definition of bone and it's functions. Also, describe the chemical composition of bone and then specifically describe alveolar process.
. Definition of Tissues Biological tissue is a collection of interconnected cells that perform a similar function within an organism. In other words, it is a group of cells working together mainly inside an organ.
3. Classification of Tissues Human body is composed of 4 basic types of tissue: •Epithelial tissue •Connective tissue •Muscular tissue •Nervous tissue
4. Origin of Tissue A fertilized egg divides to produce 3 primary germ cell layers. These layers differentiate to form the tissues of the body.
5. Epithelial Tissue Epithelial cells cover or line all body surfaces, cavities and tubes. So, These are called covering epithelia. Epithelial cells form the functional units of secretory glands. So, These are called glandular epithelia.
Hello readers,
This PPT is about the chapter:- Tissue which is in science class IX
Question Are In The Book Of NCERT
I Hope this will help You...
Thanks....
A tissue may be defined as an aggregate or collection of same type of cells performing the same general functions of the body. For example: Blood, bone, muscle etc.
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1. Activity 2:
Histology and Integument
Chapter 4 & 5 – Human Anatomy (4e) textbook
Objectives:
• Identify each tissue (26 tissues) in a histology photo
or microscope slide.
• Sketch each tissue in your lab manual.
• Identify the features of the integument (skin) on a
slide and/or model.
1
Compilation: Benjamin Sparks & Claudia Gonzales
Last Revision: Mohammad Tomaraei
2. Basic Tissue Types
• We’re going to look at four different tissue types:
1. Epithelium tissue
2. Connective tissue
3. Muscle tissue
4. Nervous tissue
2
3. Epithelium Tissues
• Epithelium is a tissue composed of cells that line the cavities and
surfaces of structures throughout the body.
• Epithelial cells have three general cell shapes: squamous,
cuboidal, and columnar.
• They are also found in varying number of cell layers, namely:
simple, stratified, and pseudostratified.
3
4. How to identify Epithelium?
1. Determine how many cell
layers are there:
• If only one layer,
it’s simple.
• If more than one layer, it’s
stratified.
2. Determine the shape of the
epithelial cells (look at cells
near the apical surface):
• Squamous
• Cuboidal
• Columnar
4
7. Important Note!
• After you have determined the number of cell layers and their
general shape, make sure to write the word “epithelium” at the
end as well!
• For example, Simple Squamous Epithelium
7
8. Simple Squamous Epithelium
• Structure:
• Single layer of thin, flat, irregularly-shaped cells resembling floor tiles
• The single nucleus of each cell bulges at its center
• Function:
• Rapid diffusion, filtration, and some secretion in serous membranes
• Location:
• Air sacs in lungs (alveoli)
• Lining lumen of blood vessels (endothelium)
• Serous membranes of body cavities (mesothelium)
• Textbook References:
• Table: p. 86, table 4.3a
• Description: pp. 84-85
8
12. Keratinized Stratified Squamous Epithelium
• Structure:
• Multiple layers of cells
• Basal cells are typically cuboidal or columnar, while apical
(superficial) cells appear squamous
• More superficial cells are dead and filled with the protein keratin
• Function:
• Protection of the underlying tissue
• Location:
• Epidermis of the skin
• Textbook References:
• Table: p. 89 table 4.4a, b
• Description: pp. 87-88
12
16. Nonkeratinized Stratified Squamous Epithelium
• Structure:
• Multiple layers of cells
• Basal cells are typically cuboidal or polyhedral, while apical cells are
squamous
• Surface cells are alive (visible nuclei) and kept moist
• Function:
• Protection of the underlying tissue
• Location:
• Lining of oral cavity, part of pharynx, esophagus, vagina, and anus
• Textbook References:
• Table: p. 89 table 4.4a, b
• Description: pp. 87-88
16
20. Simple Cuboidal Epithelium
• Structure:
• Single layer of cells as tall as they are wide
• Contains spherical, centrally located nucleus
• Function:
• Absorption and secretion
• Location:
• Thyroid gland follicles
• Kidney tubules
• Ducts and secretory regions of most glands
• Textbook References:
• Table: p. 86 table 4.3b
• Description: p. 85
20
26. Stratified Cuboidal Epithelium
• Structure:
• Two or more layers of cells
• Cells at apical surface are cuboidal
• Function:
• Protection and secretion
• Location:
• Found in large ducts in most exocrine glands and in some parts of
the male urethra
• Textbook References:
• Table: p. 90 table 4.4
• Description: p. 88
26
29. Simple Columnar Epithelium (Ciliated and Non-Ciliated)
• Structure:
• Single layer of tall, narrow cells
• Oval shaped nucleus in the basal region of cells
• Function:
• Absorption and secretion (non-ciliated)
• Secretion of mucin and movement of mucus along apical surface of
epithelium by action of cilia (ciliated)
• Location:
• Lining of most of the digestive tract (non-ciliated)
• Lining of uterine tubes and larger bronchioles of respiratory tract
(ciliated)
• Textbook References:
• Table: p. 86 table 4.3c, d
• Description: pp. 85-86 29
37. Stratified Columnar Epithelium
• Structure:
• Two or more layers of cells
• Cells at the apical surface are columnar
• Function:
• Protection and secretion
• Location:
• Rare, found in large ducts of some exocrine glands and in some
regions of the male urethra
• Textbook References:
• Table: p. 90 table 4.4d
• Description: p. 88
37
42. Pseudostratified Columnar Epithelium
• Structure:
• Single layer of cells with varying heights that appear multi-layered
• All cells connect to the basement membrane but not all cells reach the
apical surface
• Function:
• Protection
• Ciliated form also involved with secretion of mucin and movement of
mucus across surface with ciliary action
• Location:
• Ciliated form lines most of the respiratory tract
• Non-ciliated form is rare and lines the epididymis and part of male
urethra
• Textbook References:
• Table: p. 91 table 4.5a
• Description: p. 88
42
47. Transitional Epithelium
• Structure:
• Epithelial appearance varies, depending on whether the tissue is
stretched or relaxed
• Shape of cells on the apical surface changes
• Function:
• Distention and relaxation to accommodate urine volume changes in
the bladder, ureters, and urethra
• Location:
• Lining of urinary bladder, ureters, and part of urethra
• Textbook References:
• Table: p. 91 table 4.5b
• Description: p. 88
47
51. Connective Tissues
• Connective tissue is the most diverse tissue. It is widespread
although not exposed to the outside of the body. Except for
cartilage, it is highly vascular. It has widely scattered cells with
lots of space between each cell.
• Functions: Protection (bone, fat), support (bone, cartilage),
binding together (tendons, ligaments), storage of fat (bone
marrow), disease fighting (blood), and production of certain blood
cells.
51
53. Blood (Fluid Connective Tissue)
• Structure:
• Contains erythrocytes, leukocytes, and platelets
• Soluble (dissolved) protein fibers and a watery ground substance
form a fluid extracellular matrix called plasma
• Function:
• Erythrocytes transport gases, leukocytes control immune response,
platelets help with blood clotting
• Plasma transports nutrients, wastes, and hormones throughout the
body and contains clotting elements to stop blood loss
• Location:
• Primarily found within blood vessels (arteries, veins, and capillaries),
and the heart
• Textbook References:
• Table: p. 108 table 4.13
• Description: p. 105 53
61. Reticular Connective Tissue (Loose Connective Tissue)
• Structure:
• Ground substance is a gel-like liquid
• Contains a scattered arrangement of reticular fibers and extracellular
matrix
• Function:
• Provides a supportive framework for spleen, lymph nodes, thymus,
and bone marrow
• Location:
• Forms stroma of lymph nodes, spleen, thymus, and bone marrow
• Textbook References:
• Table: p. 103 table 4.9c
• Description: p. 100
61
71. Dense Regular Connective Tissue (Dense Connective Tissue)
• Structure:
• Contains densely packed and parallel collagen fibers, fibroblast
nuclei, and scarce ground substance
• Function:
• Attaches muscle to bone and bone to bone
• Resists stress applied in one direction
• Location:
• Forms tendons
• Most ligaments
• Textbook References:
• Table: p. 104 table 4.10a
• Description: p. 101
71
72. Dense Regular Connective (Dense Connective Tissue)
72
Hint: notice the unidirectional pattern of this type of connective tissue and relate it to its one-directional support
73. Dense Regular Connective (Dense Connective Tissue)
73
Hint: notice the unidirectional pattern of this type of connective tissue and relate it to its one-directional support
74. Elastic Connective Tissue (Dense Connective Tissue)
• Structure:
• Contains parallel elastic fibers, fibroblast nuclei, and ground
substance
• Function:
• Allows stretching of some organs
• Location:
• Walls of elastic arteries
• Trachea
• Bronchial tubes
• True vocal cords
• Suspensory ligaments of penis
• Textbook References:
• Table: p. 105 table 4.10c
• Description: p. 101
74
75. Elastic Connective Tissue (Dense Connective Tissue)
75
Hint: note the wave-like, rubber-band structure of elastic fibers and relate it to their flexibility
77. Dense Irregular Connective Tissue (Dense Connective Tissue)
• Structure:
• Predominantly contains collagen fibers (bundled and randomly
arranged), fibroblasts, and ground substance (more than in dense
irregular connective tissue)
• Function:
• Withstands stresses applied in all directions
• Durable
• Location:
• Dermis
• Periosteum covering bone
• Perichondrium covering cartilage
• Organ capsules
• Textbook References:
• Table: p. 104 table 4.10b
• Description: p. 101 77
78. Dense Irregular Connective Tissue (Dense Connective Tissue)
78
Hint: notice the multidirectional pattern of this type of connective tissue; you can remember dense irregular
connective tissue by its resemblance to steak
83. Compact Bone (Osseous Tissue)
• Structure:
• Calcified matrix arranged in osteons, osteocytes in lacunae, lamellae
(concentric), central canal, and canaliculi
• Function:
• Supports soft structures
• Protects vital organs
• Provides levers for movement
• Stores minerals
• Location:
• Exterior of bones of the body
• Textbook References:
• Table: p. 107 table 4.12
• Description: pp. 104-105
83
87. Compact Bone (Osseous Tissue)
87
osteocyte (in lacunae)
central canal
lamellae
(concentric)
canaliculi
Identify the structures at the arrows.
88. Hyaline Cartilage (Cartilage Tissue)
• Structure:
• Contains extracellular matrix, lacunae, chondrocytes, perichondrium (often visible)
• Function:
• Smooth surfaces for movement at joints
• Model for bone growth
• Supports soft tissue
• Location:
• Most of fetal skeleton
• Covers articular ends of long bones
• Costal cartilages
• Most of larynx, trachea, and nose
• Textbook References:
• Table: p. 106 table 4.11a
• Description: p. 103
88
103. Muscle Tissues
• Cells are long and narrow and are called fibers
• Functions through contraction in motion, posture, and heat
production
103
104. How to Identify Muscle Tissues
1. Look for the differences in the types of tissues (look at what is in
bold on the following slide)
2. Look for the structures that are particular to that type of muscle
tissue only
104
105. Types of Muscle Tissues
105
Type of Muscular Tissue Skeletal Muscle Smooth Muscle Cardiac Muscle
Shape of Fibers Elongated; blunt ends Elongated, Tapered ends Elongated; Blunt ends
Nucleus: # and Location Multinucleated,
peripheral
Uninucleated, central Uninucleated, central
Striated or
Non-striated
Striated Non-striated Striated
Branched or
Unbranched
Unbranched Unbranched Branched (Bifurcated
andIntercalatedDiscs)
Involuntary or Voluntary Voluntary Involuntary Involuntary
Location in Body Attached to bones Walls of hollow, internal
organs, and tubes
Only in wall of Heart
(Myocardium)
Speed of Contraction Fastest Slowest Intermediate
Ability to Remain
Contracted
Least Greatest Intermediate
106. Smooth Muscle
• Structure:
• Contains spindle-shaped muscle fibers that have a centrally located
nucleus
• Function:
• Involuntary movements and motion
• Moves materials through internal organs
• Location:
• Walls of hollow internal organs, such as vessels, airways, stomach,
bladder, and uterus
• Textbook References:
• Table: p. 111 table 4.14c
• Description: p. 109
106
109. Skeletal Muscle
• Structure:
• Contains long, cylindrical, unbranched muscle fibers with multiple
nuclei per fiber
• Striations are visible in each muscle fiber
• Function:
• Moves skeleton
• Responsible for voluntary body movements, locomotion, and heat
production
• Location:
• Attaches to bones or sometimes skin
• Textbook References:
• Table: p. 110 table 4.14a
• Description: p. 109
109
113. Cardiac Muscle
• Structure:
• Contains short and branched muscle fibers (also known as
cardiomyocytes) with one nucleus per cell
• Each muscle fiber exhibits striations
• Intercalated discs are located between cells
• Function:
• Involuntary contractions and relaxations pump blood in the heart
• Location:
• Heart wall (myocardium)
• Textbook References:
• Table: p. 110 table 4.14b
• Description: p. 109
113
128. Integumentary System – Hypodermis / Subcutaneous Layer
• Description:
• Not part of the integument proper
• Made of areolar connective tissue and adipose tissue
• Often called superficial fascia
128