Write all types of tissue and
briefly explain all
Answers
Explanation:
Tissues are groups of cells that have a similar structure and act together to perform a specific function. There are four different types of tissues in animals: connective, muscle, nervous, and epithelial. ... In plants, tissues are divided into three types: vascular, ground, and epidermal.
Answer:
The four types of tissues are:
Epithelial tissue.
Connective tissue.
Muscle tissue.
Nerve tissue.
The four types of tissues are similar in that each consists of cells and extracellular materials. However, the types of tissues have different types of cells and differ in the percentage composition of cells and the extracellular materials.
Epithelial Tissue
Epithelial tissue is specialized to protect, absorb, and secrete substances, as well as detect sensations. It covers every exposed body surface, forms a barrier to the outside world, and controls absorption. Epithelium forms most of the surface of the skin, and the lining of the intestinal, respiratory, and urogenital tracts. Epithelium also lines internal cavities and passageways such as the chest, brain, eye, inner surfaces of blood vessels, the heart, and the inner ear.
Functions of epithelium include:
Providing physical protection from abrasion, dehydration, and damage by xenobiotics.
Controlling the permeability of substances in entering or leaving the body.
Some epithelia are relatively impermeable; others are readily crossed.
Various toxins can damage this epithelial barrier.
Detecting sensation (sight, smell, taste, equilibrium, and hearing) and conveying this information to the nervous system.
For example, touch receptors in the skin respond to pressure by stimulating adjacent sensory nerves.
Connective Tissue
Connective tissues provide support and hold the body tissues together. They contain more intercellular substances than the other tissues. Connective tissues include blood; bone; cartilage; adipose (fat); and the fibrous and areolar (loose) connective tissues that give support to most organs. The blood and lymph vessels are immersed in the connective tissue media of the body. The blood-vascular system is a component of connective tissue.
In addition to connecting, the connective tissue plays a major role in protecting the body from outside invaders. The hematopoietic tissue is a form of connective tissue responsible for the manufacture of all the blood cells and immunological capability. Phagocytes are connective tissue cells and produce antibodies. If invading organisms or xenobiotics get through the epithelial protective barrier, the connective tissue acts to defend against them.
Muscle Tissue
Muscular tissue is specialized for an ability to contract. Muscle cells are elongated and called muscle fibers. When one end of a muscle cell receives a stimulus, a wave of excitation is conducted through the entire cell so that all parts contract in harmony.
There are three types of muscle cells:
Skeletal muscle — attached to bone and contracts causing the bones to move.
Cardiac muscle — contracts to force blood out of the heart and around the body.
Smooth muscle — can be found in several organs, including the digestive tract, reproductive organs, respiratory tract, and the lining of the bladder. Examples of smooth muscle activity are the:
Contraction of the bladder to force urine out.
Peristaltic movement to move feces down the digestive system.
Contraction of smooth muscle in the trachea and bronchi which decreases the size of the air passageway.
Nerve Tissue
Nervous tissue is specialized with a capability to conduct electrical impulses and convey information from one area of the body to another. Most of the nervous tissue (98%) is located in the central nervous system, the brain, and spinal cord.
There are two types of nervous tissue: 1) neurons and 2) neuroglia. Neurons (Figure 5) actually transmit the impulses. Neuroglia (Figure 6) provide physical support for the neural tissue, control tissue fluids around the neurons, and help defend the neurons from invading organisms and xenobiotics. Receptor nerve endings of neurons react to various kinds of stimuli (for example, light, sound, touch, and pressure) and can transmit waves of excitation from the farthest point in the body to the central nervous system.