Animal tissues

The varitions of animal tissues according to the structure and functions.

Some parts of an animal are very hard while others are soft or like a liquid. These variations are specialized to perform the animal's particular functions. Tissues are group of cells of one type or different types which are specialized to perform a particular function and have common origin. Animal bodies are comprised of several tissues.

BLOOD TISSUE

* Consists of blood plasma and blood cells.

* Red blood cells transport oxygen.

* White blood cells protect the body from diseases.

* Platelets are important in blood clotting.

MUSCLE TISSUE

* Composed of muscle fibers.

* Classified into three groups.

Skeletal muscle

* Participates in moving body parts.

* Attached to the skeleton by tendons.

* Fibers are striated.

* Muscles are voluntary.

Cardiac muscle

* Made up of branched and striated muscles.

* Uni-nucleated.

* Fibers have large number of mitochondria.

* Muscles are involuntary.

Smooth muscle

* Spindle shaped and unstriated muscles.

* Uni-nucleated.

* Muscles are involuntary.

* Can found in intestine, stomach, blood vessels, urinary system

etc.

EPITHELIAL TISSUE

* Functions as a lining tissue.

* Main functions are sensory, protection, absorption, and

secretion.

* Classified into three groups.

• Squamous epithelium

• Cuboidal epithelium

• Columnar epithelium