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
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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.
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
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
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.