Which statement regarding the relaxation phase of a muscle twitch is true?
A) The phase begins at stimulation and typically lasts about two milliseconds.
B) Muscle tension falls to resting levels.
C) The action potential sweeps across the sarcomere during this period.
D) Tension rises to a peak.
E) Cross-bridges are interacting with active sites on actin filaments throughout this period.
B) Muscle tension falls to resting levels.
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The two divisions of the autonomic nervous system
A. function only during sleep. B. use preganglionic and postganglionic neurons to innervate skeletal muscle. C. are composed of PNS structures only. D. contain autonomic ganglia to house ganglionic neurons. E. are voluntary.
Which of the following is not a side effect of constipation?
a. Headache b. Nausea c. Gradual buildup of toxins d. Lack of appetite e. None of the above are side effects.
Articulations permitting only slight degrees of movement are ________, whereas articulations permitting no movement are called ________
A) amphiarthroses; synarthroses B) synarthroses; amphiarthroses C) diarthroses; amphiarthroses D) amphiarthroses; diarthroses E) diarthroses; synarthroses
Beta receptor stimulation results in all of the following effects, EXCEPT:
A) positive cardiac inotropy. B) positive cardiac chronotropy. C) vascular smooth muscle contraction. D) relaxation of bronchiole smooth muscle