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Muscle Tissue - control of response to that stimulus Nerve...

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Muscle Tissue Smooth muscle fibers, shown in Figure 12, lack the banding, although actin and myosin still occur. These cells function in involuntary movements and/or autonomic responses (such as breathing, secretion, ejaculation, birth, and certain reflexes). Smooth muscle fibers are spindle shaped cells that form masses. These fibers are components of structures in the digestive system , reproductive tract, and blood vessels.
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Cardiac muscle fibers are a type of striated muscle found only in the heart. The cell has a bifurcated (or forked) shape, usually with the nucleus near the center of the cell. The cells are usually connected to each other by intercalated disks, as shown in Figure 13. Nervous Tissue Nervous tissue , shown in Figure 14, functions in the integration of stimulus and
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Unformatted text preview: control of response to that stimulus. Nerve cells are called neurons . Each neuron has a cell body, an axon , and many dendrites . Nervous tissue is composed of two main cell types: neurons and glial cells. Neurons transmit nerve messages. Glial cells are in direct contact with neurons and often surround them. The neuron is the functional unit of the nervous system. Humans have about 100 billion neurons in their brain alone! While variable in size and shape, all neurons have three parts. Dendrites receive information from another cell and transmit the message to the cell body. The cell body contains the nucleus, mitochondria and other organelles typical of eukaryotic cells. The axon conducts messages away from the cell body....
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