Two substances that are useful for dissolving blood clots are
A. urokinase and streptokinase.
B. calcium ions and prothrombin activator.
C. thrombus and embolus.
D. factor IV and factor XII.
Answer: A
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The plateau phase of an action potential
A. occurs only in skeletal muscle and makes those fibers' contractions most forceful. B. leads to tetanic contractions in smooth and skeletal muscle. C. allows cardiac muscle cells to contract and then relax without locking up. D. allows cardiac muscle cells to exhibit synchronous fibrillation.
Which of the following is involved in muscle relaxation?
a. Acetylcholinesterase removes ACh and the muscle cell returns to resting potential. b. Ca2+ is actively taken up by the lateral sacs when there is no longer an action potential. c. The cross bridges pull the filaments back to their original resting positions. d. Both a and b e. Both b and c
The perineum is a diamond-shaped area at the inferior end of the trunk between the buttocks and thighs of both males and females
a. True b. False Indicate whether the statement is true or false
The LH surge is caused by ________.
A. rapid increase in progesterone B. more FSH receptors placed in granulosa cells C. a quick drop in FSH D. estradiol increasing frequency of GnRH pulses