B. Connective Tissue Connective tissues have a sparse population of cells scattered through an extracellular matrix. The matrix consists of a web of molecules that "glue" the cells together in the connective tissues The structure of connective tissue correlates with its function. It binds and supports other tissues.
Components of Connective Tissue
Matrix : noncellular material - solid, semisolid, or liquid
Fibers : collagen, elastic, reticular
Cells : various types
Loose fibrous connective tissue
Supports epithelium and many internal organs
Forms a protective covering enclosing many internal organs
Dense fibrous connective tissue
Contains many collagen fibers
Found in structures such as tendons and ligaments
Both types have cells called fibroblasts separated by a jellylike matrix with collagen and elastic fibers
Loose connective tissue (under the skin) Blood Adipose Tissue Fat droplets Fibrous connective Tissue (tendons) Cartilage (at the end of the bone) Bone
1. Loose connective tissue:
is the most widespread connective tissue.
It binds epithelia to underlying tissues.
It holds organs in place.
2. Blood :
is a connective tissue with a matrix of liquid.
Red and white blood cells are suspended in plasma.
3. Fibrous connective tissue:
has a dense matrix of collagen.
It forms tendons and ligaments.
Its matrix is strong but rubbery.
It functions as a flexible, boneless skeleton.
It forms the shock-absorbing pads that cushion the vertebrae of the spinal column.
is a rigid connective tissue with a matrix of rubbery fibers hardened with deposits of calcium.
4. Adipose tissue stores fat:
It stockpiles energy.
It pads and insulates the body.
Unlike other types of connective tissue in that the matrix (i.e., plasma) is not made by the cells
Transports nutrients and oxygen and removes carbon dioxide and wastes
Helps distribute heat
Plays role in fluid, ion and pH balance
Protects us from disease
Blood clotting protects against fluid loss
Components of Blood
Plasma – 55% of volume
Variety of inorganic and organic substances dissolved or suspended in water
The next level in the structural hierarchy is the organ.
An ORGAN consists of 2 or more tissues packaged into one working unit that performs a specific function.
Examples : heart, liver, stomach, brain, and lungs
Example of an Organ: THE SMALL INTESTINE Epithelial Tissue Connective Tissue (blood and lymph vessels) Smooth muscle Tissue (2 layers) Connective Tissue Epithelial Tissue
The organs of humans and most other animals are organized into organ systems. Organ systems are teams of organs that work together to perform a vital bodily function. 4. ORGAN SYSTEMS
Which of the following are listed in the correct hierarchical order, from least complex to most complex? A) cell, tissue, organ B) tissue, organ, cell C) organ, tissue, cell D) cell, organ, tissue E) tissue, cell, organ A
Groups of cells that perform a similar function are known as: A) organs. B) organ systems. C) control centers. D) organisms. E) tissues. A
Blood is a type of: A) epithelial tissue. B) muscle tissue. C) collagen. D) connective tissue. E) nerve tissue. D
Which organ system is NOT essential for survival of an individual? A) digestive system B) respiratory system C) muscular system D) nervous system E) reproductive system E
The skin is an example of a(n): A) organ. B) cell. C) ligament. D) tissue. E) organ system. A