In the hierarchy of skeletal muscle fiber components, the myofibril is made up of myofilaments.
Indicate whether this statement is true or false.
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Question 2) The T-tubules and sarcoplasmic reticulum are unique to muscle fibers.
Indicate whether this statement is true or false.
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Question 3) The fat and connective tissue that encircle a beef steak form the endomysium.
Indicate whether this statement is true or false.
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Question 4) This sarcomere depicts relaxed muscle. What does number 1 refer to?
A. A band
B. H zone
C. Z disc
D. M line
E. I band
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Question 5) Rather than tightly coupled synapses between neurons and muscle cells, single-unit smooth muscle contains
A. gap junctions that connect neurons to smooth muscle cells.
B. varicosities of a subset of muscle fibers so that individual cells can be separately stimulated.
C. diffuse junctions where neuron varicosities are responsible for neurotransmitter release.
D. plaques and caveolae that contain multiple hormone receptors for discrete endocrine control.
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Question 6) The most abundant form of smooth muscle is
A. single-unit, which is also known as visceral smooth muscle.
B. cardiac muscle, which is also known as visceral smooth muscle.
C. multiunit, which is also known as visceral smooth muscle.
D. multiunit, which is also known as varicose muscle.
E. single-unit, which is also known as somatic nervous system muscle.
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Question 7) Smooth muscle tissue in which cells are individually sent signals to contract (rather than contracting in unison) is referred to as
A. single-unit.
B. multiunit.
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Question 8) The iris of the eye contains
A. skeletal muscle.
B. multiunit smooth muscle.
C. single-unit smooth muscle.
D. cardiac muscle.
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Question 9) This sarcomere depicts relaxed muscle. Which number identifies the M line?
A. 1
B. 3
C. 4
D. 5
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Question 10) When smooth muscle is stretched for a prolonged period of time, it responds by
A. contracting.
B. relaxing.
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