Histology: Study of Human Body Tissues
What is (summary)
Histology is the science that studies the tissues of the human body. Tissues are formed by groups of cells of similar shape and function.
Simply put we can understand that the cell is the fundamental unit of the body, the tissues are the association of several similar cells, the organs are the junction of various tissues that perform a certain function, the systems are the union of various organs (nervous system , lymphatic, skeletal, respiratory, integumentary, circulatory, etc.) and that the union of all systems forms the organism.
What are you studying
The tissues of our body can be classified into epithelial tissue, connective tissue, muscle tissue and nervous tissue.
The epithelial tissue presents as characteristics: lack of space between cells, absence of vascularization and great capacity for cell renewal. Its main function is to protect the body against the penetration of microorganisms, chemicals and physical aggression.
It finds itself covering the body externally (epidermis and cornea) and the inner surface of hollow organs such as the stomach, ear, nose, lung, mouth, uterus, bladder, etc. In addition, it is responsible for the formation of glands (liver, pancreas, salivary glands, etc.).
The connective tissue has space between cells, is richly vascularized, has low cell turnover and interstitial material (collagen, elastic and reticular fibers), also has interstitial fluid (where cells remove their nutrients and deposit their waste).
Among its various functions, this tissue has a very important: unite and separate organs at the same time. Underneath all epithelial tissue, there must necessarily be connective tissue.
Muscle tissue has specialized cells for contraction. Its function is to allow movement, postural maintenance and heat production. Unlike the tissues mentioned above, it has no cell renewal.
Nerve tissue is made up of nerve cells (neurons) as well as protective and supporting cells called neuroglia. As in muscle tissue, it is formed by cells that do not renew.