What theory of muscle contraction involves thick myofilaments grabbing thin myofilaments and pulling them toward the center of the sarcomere?
A. Sliding filament theory
B. Cross-bridge theory
C. All or nothing theory
D. Power stroke theory
Answer: A
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Eyebrow hairs are always shorter than hairs on your head because ________.
A) they grow much slower B) eyebrow follicles are only active for a few months C) the vascular supply of the eyebrow follicle is one-tenth that of the head hair follicle D) hormones in the eyebrow follicle switch the growth off after it has reached a predetermined length
Opening either a chemically-gated Na+ channel or a chemically-gated K+ channel during the resting potential would cause
a. an impulse to be propagated b. a graded potential c. an action potential d. the membrane's potential to becomes more negative e. threshold voltage will be reached
Contraction of the _______ will increase the superior-inferior dimension of the thoracic cavity
A. rectus abdominis B. internal intercostals C. diaphragm D. external intercostals E. sternocleidomastoid
The membrane of a contractile cardiac muscle cell contains
A. fast voltage-gated sodium channels and slow voltage-gated calcium channels. B. fast voltage-gated sodium channels and fast voltage-gated calcium channels. C. slow voltage-gated sodium channels and fast voltage-gated calcium channels. D. slow voltage-gated sodium channels and slow voltage-gated calcium channels.