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HUMAN ANATOMY- SLCC EXAM REVIEW QUESTIONS AND ANSWERS
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HUMAN ANATOMY- SLCC EXAM REVIEW QUESTIONS AND ANSWERS
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HUMAN ANATOMY- SLCC EXAMREVIEW QUESTIONS AND ANSWERS
Transfer tubules (t-tubules) - Answer-tube that extends into sarcoplasm that enable
impulses to travel which causes the smooth ER to release; allows electrical signal to
pass to inner parts of cells calcium=muscle contraction
What are cross bridges? What is their function? - Answer-formed by myosin heads that
bind actin and myosin;
In the sarcomere what changes length during a muscle contraction? - Answer-A band
remains the same, the H and I band both shorten and the Z lines come closer together
What is the function of acetylcholine? Where is it found? - Answer-activates muscle
contractions and is found in the preganglionic sympathetic and parasympathetic
neurons of the autonomic nervous system.
Describe a cross-bridge cycle? - Answer-formed when myosin heads from thick
myofilaments bind with actin from thin myofilaments
Functional Unit of contraction is: - Answer-the sarcomere
the formation of a cross bridge is formed when - Answer-calcium ions that are released
from the smooth ER and bind to troponin
what activates the myosin? - Answer-ATP
Isometric contraction: - Answer-static muscle movement without a noticeable change in
angle of the joint; length is constant
Isotonic contraction: - Answer-Load(weight) does not change, two types are concentric
and eccentric
Excitability: - Answer-respond to stimuli, muscles can be stretched to their normal
resting length and beyond to a limited degree.
Contractility: - Answer-Stimulation to muscles that causes tension
Elasticity: - Answer-ability to return to its original length after being stretched once
tension is released
Extensibility: - Answer-the ability of a muscle to extend to a predetermined endpoint
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