The blood vessel that branches from the subclavian artery to supply the anterior wall of the chest is the
A) internal thoracic.
B) azygos artery.
C) mediastinal artery.
D) thoracic aorta.
E) vertebral artery.
A
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The articulating surface of the calcaneus resting on the sustentaculum tali is the ____________________.
Fill in the blank(s) with the appropriate word(s).
In which situation would an injected drug be the most effective agonist for an endogenous chemical messenger?
A. The drug has a lower affinity for the messenger's receptors than the messenger does. B. The drug achieves 50% saturation of the messenger's receptors at a lower concentration than that required by the messenger. C. The drug does not couple to the binding site of the messenger's receptor. D. The drug binds to an alternate binding site on the protein receptor and reduces its affinity for the endogenous chemical messenger.
Removal of the seminal glands would result in semen
A) that lacked sperm. B) with a higher-than-normal pH. C) with less fructose. D) with no lubricating fluids. E) that lacked androgens.
The walls of bones are composed of ________.
A) spongy bone B) spicules C) trabecular bone D) cancellous bone E) compact bone