Tissue Types Within the Human Body
The nervous tissue is found in the nervous system, and includes the brain, spinal cord and nerves through out the organism. The tissues main function is to carry messages throughout the body, gathering and feeding back information via electronic impulses along specialised cells called neurones. Like an information highway it synchronizes the working of the nervous system by sending messages, to ensure that the all the body's systems work together, maintaining the constant internal conditions needed and enabling the body to respond to external stimuli.
The basic unit of structure of nervous tissue is the neuron, consisting of a nerve cell body and several processes: dendrites, which carry impulses toward the nerve cell body, and axons, which carry impulses away from the cell body. Neurons receive signals from either the external or internal environment, and transmit them in the form of electrical impulses to other neurons, muscles or glands. There are three types of neurons: sensory neurons, motor neurons, and interneurons.
Within the nervous system, where the tissues can be found there are four main nerve groups that link back from the body to the brain through the spinal cord. There are two main systems the peripheral nervous system, which has sensory nerves through out the body with it connects to the central nervous system the spinal cord and brain. Sensory nerves send messages to the glands and the muscles, telling them what to do.
The functions of epithelial tissue include transportation of materials, protection of underlying tissues, absorption of water and nutrients and secretion of waste products.
Epithelial tissue covers the whole surface of the body. It is made up of cells closely packed and ranged in one or more layers. This tissue is specialised to form the covering or lining of all internal and external body surfaces. Epithelial tissue that occurs on surfaces on the...