The thymus contains ______ lobes and is located _______
A.
2; anterior to the laryngeal prominence (Adam's apple)
B.
2; in the mediastinum
C.
4; anterior to the laryngeal prominence (Adam's apple)
D.
4; in the mediastinum
B
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If you are exposed to hepatitis A and have not been vaccinated against it, you may receive antibodies from another person. This is an example of ________.
A. natural passive immunity B. natural active immunity C. artificial active immunity D. artificial passive immunity
The vessel that receives blood from the head, neck, chest, shoulders, and arms is the
A) internal jugular vein. B) external jugular vein. C) superior vena cava. D) inferior vena cava. E) coronary sinus.
Parasympathetic stimulation of the ciliary muscles allows one to see close-up objects
Indicate whether this statement is true or false.
A drug decreases heart rate by blocking a receptor on cardiac muscle cells. This drug probably binds to:
A) ?1 receptors. B) ?2 receptors. C) ?1 receptors. D) nicotinic cholinergic receptors.