Animal Tissues — Question 1

The animal tissues are of following types:

1. Epithelial Tissue— They are further classified as follows:
   1. Squamous epithelium — It protects the body and the organs from injury and entry of germs.
   2. Columnar epithelium — They are present in the linings of the stomach, intestines and pharynx. They are specialized to absorb nutrients.
   3. Cuboidal epithelium — They are found in thyroid gland, kidney tubules, salivary gland, pancreas and liver. They are specialized to secrete enzymes and hormones and remove waste (as in kidneys).
2. Muscular tissue— They are of following types:
   1. Voluntary muscles — These muscles help in the movement of the bones.
   2. Involuntary muscles — These muscles are not under our control or will. They help in movement of food, movement of urine from urinary bladder and so on.
   3. Cardiac muscles — Cardiac muscles cause the rhythmic movement of the heart resulting in circulation of blood in the body.
3. Nervous tissues— Nervous tissues help in the control and coordination of the body. The information or message is transmitted by a neuron in the form of impulses and in one direction only.
4. Connective tissue— They are further classified into following types:
   1. Connective tissue proper — This tissue connects various parts of the body. It connects muscles to bones, bones to other bones and gives support by filling up spaces between the organs.
   2. Skeletal tissue — It is solid connective tissue which provide support to the body. It constitutes of bone and cartilage.
   3. Fluid connective tissue — It is the liquid connective tissue consisting of blood and lymph. It has functions like transportation of oxygen and nutrients and fighting infection.