1.Which of the following is not a specialized part of the neuromuscular junction

ID: 3479262 • Letter: 1

Question

1.Which of the following is not a specialized part of the neuromuscular junction?

A.)Each muscle fiber is innervated by multiple motor neurons.

b.Every action potential that reaches the axon terminal of the motor neuron will generate an action potential in the healthy muscle fiber.

c. The terminal bouton fans out over a wide area of the sarcolemma.

d. There is a high density of acetylcholine receptors in the motor end plate.

e. the motor end plate has greater surface area, compared with other synapses.

2.) What is the primary function of the atrioventricular and semilunar valves?

a. to control the volume of blood which enters and leaves the heart

b. to coordinate the autorhythmic movements of the heart

c. to control the speed with which blood enters and leaves the heart

d. to permit blood to flow forward while preventing it from flowing backward

e. to keep the right and left sides of the heart separated

3. Synthesis of red blood cells is called _____ and occurs in the _____.

a. erythropoiesis; bone marrow

b. erythropoiesis; spleen

c. hemostasis; kidneys

d. erythropoiesis; kidney

e. hemostasis; bone marrow

4.What does a person's hematocrit measure?

a.the percentage of blood that is comprised of red blood cells only

b.the percentage of blood that is comprised of plasma

c.the percentage of blood that is comprised of red and white blood cells

d.the amount of hemoglobin in blood

e.the amount of oygen that can be transported by blood

1. Answer b. Action potential has to cross the threshold to become endplate potential

2. Answer d. The valves keep the Chambers of the heart separate so that no mixing of arterial and venous blood occurs during the cardiac cycle.

3. Answer a.

4. Answer a.

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