Explain the structure and function of different types of epithelial tissues, connective tissue, muscular tissues, and nervous tissues.

1. Epithelial tissues: Epithelial tissues are made up of thin, irregular-shaped cells that are tightly packed and form a continuous sheet. They are present throughout the body, form the covering of the external surfaces, internal cavities, and organs of the animal body.

The skin, lining of the mouth, blood vessels, mouth, alveoli cells of lungs, nose, esophagus, and kidney tubules are made of epithelial tissue.

The functions of epithelial tissues are absorption, protection, filtration, secretion, diffusion, sensory reception, and excretion.

2. Connective tissues: Blood and lymph are the fluid connective tissues. Blood is made up of red blood cells (RBCs), white blood cells (WBCs), and platelets which are present in the plasma.

RBCs contain hemoglobin and the function of RBCs is to transport oxygen.

WBCs form a defense system to protect against foreign antigens.

Platelets function is blood clotting. Plasma contains proteins, water, hormones, and salts which are transported to different body parts. All components of blood except RBCs form lymph.

Lymph transports absorbed fat as it cannot enter the bloodstream directly. The WBCs in lymph help in fighting infection and get rid of toxins and waste materials.

3. Muscular tissues: The tissues that are used to constitute the muscular system consisting of skeletal, smooth, and cardiac muscles that allow movement of the body, maintains posture, and circulates blood throughout the body.

The muscular system is composed of muscle fibers and their function is contractibility. Every muscle is an organ made of blood vessels, skeletal muscle tissue, nerves, and tendons.  

4. Nervous tissues: The tissues present in the main organs of the human nervous system are the brain, the spinal cord, and the nerves.
 The function of the nervous system is to coordinate or establish the communication system between the organs of our body. The nervous system regulates all the other systems of our body to work together.


Simply Easy Learning

Updated on: 16-Jan-2023


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