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Cards In This Set
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What are the three types of muscular tissue?
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Skeletal, Cardiac, and Smooth
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How are the 3 muscle tissues different from one another?
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Differ in microscopic anatomy, location, and how they are controlled by nervous and endocrine systems.
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What is skeletal tissue's function?
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Its purpose is to move bones of the skeleton.
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Describe skeletal tissue.
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It is striated with alternating light and dark bands (striations), that can be seen under the microscope.
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Describe how skeletal muscle works.
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It is voluntary, consciously controlled by neuron (nerve cells) that are part of the somatic (voluntary) division of the nervous system.
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Where is cardiac muscle located?
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Only in the heart, forms most of the heart wall.
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Describe cardiac muscle and how it works.
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Striated, and its action in involuntary. The alternating contraction and relaxation are initiated by internal pacemaker.
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Where is smooth muscle located?
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In the walls of hollow internal structures, such as blood vessels, airways, organs in abdominopelvic region, and skin attached to hair follicles
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Describe smooth muscle and how it works.
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Nonstriated (smooth), usually involuntary, both cardiac and smooth muscle are part of autonomic (involuntary) div. of nervous system
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What are the four key functions of muscular tissue?
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Producing mvmnts, stabalizing body positions, storing and moving substances w/in the body, generating heat.
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Producing Movements
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Movements of the whole body as a result in muscle contractions, rely on integrated functioning of skeletal muscles, bones and joints
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Stabilizing body positions
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Skeletal muscle contractions stabalize joints and help maintain body positions. Postural muscles contract continuously.
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Storing and moving substances within the body
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Accomplished and sustained contractions of ring- like bands of smooth muscles called sphincters, which prevent outflow
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Generating heat
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As muscular tissue contracts, it produces heat, the process is known as thermogenesis. Much of that heat is used to maintain normal body temp.
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What are the four special properties that enable muscular tissue to function and contribute to homeostasis?
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Electrical excitability, Contactility, Extensibility, Elasticity
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