Module Two Lesson One
By: Jailene Jaimes
Epithelial tissue is found throughout the body. It covers the inside and outside of body surfaces, including organs. It lines the cavities, tubes, ducts and blood vessels, and is the main tissue of glands. Functions include protection, as the skin protects our bodies from physical and chemical injury, and microbial invasion. Epithelial tissue functions in absorption. It also functions in filtration and excretion, as the kidneys get rid of excess wastes. Epithelial tissue functions in secretion, as it makes up the glands which synthesize fluid or hormones for the body.
Connective tissues wrap around organs and can be found between and within same organs. It can also be found in adipose (fat), skin, bones, cartilage, tendons, ligaments and blood. It connects, binds and supports structures, such as tendons and ligaments. As it wraps around organs, it protects and cushions them. The extracellular matrix can bear weight, stretch and take abuse. As adipose or fat, it insulates and fills space, as well as stores fat. Another special type of connective tissue, blood, functions to transport nutrients and other substances throughout the body. Bone is another type of connective tissue, and it functions as being the supporting framework of our body, as well as protecting our organs.
Muscle tissue is associated with skeletal bones, composes the heart, and is found in the walls of hollow organs. The muscle bundles attach to the bones for movement. The function of muscle tissue depends on what type of muscle it is. Skeletal muscles are responsible for body movement. Smooth muscle functions to move blood, food and waste through body’s organs, and cardiac muscle controls synchronized contractions of the heart to produce the heartbeat.
* Nervous Tissue *
Nervous tissue is found in the brain, spinal cord and nerves. It is the main component of the nervous system. The main function is to generate and transmit nerve impulses to and from body organs via neurons. Some cells, called neuroglia, support, insulate and protect neurons, which generate the impulses. The nervous tissue is the most important because if signal impulses were not sent to the brain, the whole body would not function in any way possible.