The exchange of nutrients and gases between the blood and tissue cells is the primary function of ________.

A. veins
B. venules
C. arteries
D. arterioles
E. capillaries


Answer: E

Anatomy & Physiology

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In a skeletal muscle fiber, Ca2+ is released from

a. ACh receptors. b. the motor end plate. c. the sarcoplasmic reticulum. d. the sarcolemma and T-tubules.

Anatomy & Physiology

Calsequestrin in cardiac muscle:

A. acts as a high affinity Ca++ buffer in the cytosol B. acts as a low affinity Ca++ buffer in the SR lumen, near the ryanodine receptor C. promotes Ca++ accumulation by the mitochondria D. increases the Ca++ affinity of the sarcolemmal Ca++ pump E. facilitates myosin binding to the actin thin filament

Anatomy & Physiology

When a muscle fiber contracts, the I bands nearly disappear, the H zones disappear, and the A bands move closer together but do not change in length

Indicate whether the statement is true or false

Anatomy & Physiology

A local anesthetic such as Novocaine decreases membrane permeability to Na+ ions. The use of this anesthetic will

A. block sensory input into the CNS. B. enhance the development of EPSPs. C. cause RMP to move closer to threshold. D. cause Cl- ions to enter cells instead of Na+ ions. E. depolarize the cell.

Anatomy & Physiology