The extensor digitorum muscle is found in the
A. deep layer of the posterior compartment of the forearm.
B. superficial layer of the posterior compartment of the forearm.
C. superficial layer of the anterior compartment of the forearm.
D. deep layer of the anterior compartment of the forearm.
B
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The embryonic layers that give rise to all of the body's mature tissues are called ______.
Fill in the blank(s) with the appropriate word(s)
In the condition known as complete heart block, what happens?
A) The fibrous skeleton of the heart breaks down, interfering with the passage of blood from the atria to the ventricles. B) The mitral valve leaflets calcify and close, preventing blood from being pumped efficiently by the left side of the heart. C) Coronary arteries are blocked by plaques, preventing blood and oxygen from reaching the myocardial contractile cells. D) Blood flow through the foramen ovale is blocked. E) Electrical signals from the SA node never reach the ventricles, so the contraction of the atria is not coordinated with the contraction of the ventricles.
Each red blood cell is shaped as a biconcave disk. This allows it to
A) change its shape to squeeze through narrow openings and shrink or swell slightly in response to osmotic conditions. B) change its shape to squeeze through narrow openings, shrink or swell slightly in response to osmotic conditions, and synthesize new proteins and membrane components readily. C) shrink or swell slightly in response to osmotic conditions. D) change its shape to squeeze through narrow openings. E) synthesize new proteins and membrane components readily.
Which of the following terms means "farther from the head"?
A. distal B. proximal C. superior D. inferior