Which of the following describes the cells of unitary smooth muscle?
A) They exhibit spontaneous action potentials.
B) They are used for vision and hair raising.
C) They depend upon recruitment using the autonomic nervous system.
D) They consist of muscle fibers that are structurally independent of each other.
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Question 2) Matching
A) Direct phosphorylation
B) Anaerobic pathway
C) Aerobic pathway
33) Marathons.
34) 25 meter swim.
35) Weight lifting.
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Question 3) On the basis of structural classification, which is a fibrous joint?
A) pivot
B) syndesmosis
C) symphysis
D) synchondrosis
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Question 4) A contraction in which the muscle does not shorten but its tension increases is called isometric contraction.
Indicate whether the statement is true or false
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Question 5) The mechanism of contraction in smooth muscle is different from skeletal muscle in that ________.
A) ATP energizes the sliding process
B) the site of calcium regulation differs
C) the trigger for contraction is a rise in intracellular calcium
D) actin and myosin interact by the sliding filament mechanism
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Question 6) A joint united by fibrocartilage tissue that usually permits a slight degree of movement is a ________.
A) symphysis
B) gomphosis
C) suture
D) syndesmosis
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Question 7) Tendon sheaths ________.
A) act as friction-reducing structures
B) help anchor the tendon to the muscle
C) are lined with dense irregular connective tissue
D) are extensions of periosteum
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Question 8) Which of the following is the correct sequence of events for muscle contractions?
A) muscle cell action potential, neurotransmitter release, ATP-driven power stroke, calcium ion release from SR, sliding of myofilaments
B) motor neuron action potential, neurotransmitter release, muscle cell action potential, release of calcium ions from SR, ATP-driven power stroke, sliding of myofilaments
C) neurotransmitter release, motor neuron action potential, muscle cell action potential, release of calcium ions from SR, ATP-driven power stroke
D) neurotransmitter release, muscle cell action potential, motor neuron action potential, release of calcium ions from SR, sliding of myofilaments, ATP-driven power stroke
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Question 9) Matching
A) Sodium ions
B) Acetylcholinesterase
C) Calcium ions
D) Acetylcholine
E) Creatine phosphate
27) The final chemical messenger and trigger for muscle contraction. It binds to troponin.
28) A neurotransmitter released at motor end plates by the axon terminals.
29) It diffuses across the cell membrane resulting in depolarization.
30) Activates synaptic vesicles in axon terminals to fuse with plasma membrane of axon terminal.
31) Used to convert ADP to ATP by transfer of a high-energy phosphate group. A reserve high-energy compound.
32) Breaks down ACh into its building blocks, rendering it ineffective.
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Question 10) Peristalsis is characteristic of smooth muscle.
Indicate whether the statement is true or false
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