Epithelial tissue is one of the four main types of tissues in the human body. It covers the body surface, lines cavities and tubes, and forms glands. It is made up of tightly packed cells, providing a protective barrier and serving various functions such as secretion, absorption, and sensation.
There are several types of epithelial tissue, classified based on their shape and arrangement of cells. These include:
Squamous epithelium: These cells are flat and thin, providing a smooth surface. They are found in the lining of blood vessels and air sacs of the lungs.
Cuboidal epithelium: These cells are cube-shaped and are involved in secretion and absorption. They are found in the kidney tubules and glands.
Columnar epithelium: These cells are tall and narrow, specialized for secretion and absorption. They line the digestive tract and the respiratory tract.
Transitional epithelium: These cells can change shape, making the tissue stretchable. They line the urinary bladder and ureters.
Energy - A. Energy is involved in all physical and chemical processes. It is conserved, and can be transformed from one form to another and into work. At the atomic and nuclear levels energy is not continuous but exists in discrete amounts. Energy and mass are related through Einstein's equation E=mc 2 . B. The properties of atomic nuclei are responsible for energy-related phenomena such as radioactivity, fission and fusion. C. Changes in entropy and energy that accompany chemical reactions influence reaction paths. Chemical reactions result in the release or absorption of energy. D. The theory of electromagnetism explains that electricity and magnetism are closely related. Electric charges are the source of electric fields. Moving charges generate magnetic fields. E. Waves are the propagation of a disturbance. They transport energy and momentum but do not transport matter.
Relate temperature to the average molecular kinetic energy.