All prostaglandins are derived from a 20-carbon precursor molecule called
a) thromboxane.
b) intrinsic factor.
c) thymopoietin.
d) arachidonic acid.
e) cholesterol.
d
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Active sites become exposed when calcium ions bind to
A) tropomyosin. B) actin. C) myosin. D) troponin. E) calcium channels.
Which of the following muscles inverts the foot?
A) tibialis anterior B) tibialis posterior C) flexor digitorum longus D) gatsrocnemius
Which of the following orientation and directional terms have the same meaning (in humans)?
A) superior and caudal B) inferior and cranial C) inferior and cephalic D) anterior and ventral E) anterior and dorsal
Which of the following is correct concerning the location of the kidneys?
A) They are against the anterior wall of the abdominal cavity. B) Their upper borders are about at the level of the third lumbar vertebra. C) They are located behind the parietal peritoneum. D) The right kidney is usually higher than the left one.