If there is an increase in the extracellular Na+ ion concentration, the result is
A) depolarization of the plasma membrane.
B) hyperpolarization of the plasma membrane.
C) little, if any, change in the resting membrane potential of the plasma membrane.
Answer: C) little, if any, change in the resting membrane potential of the plasma membrane.
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What will be an ideal response?
Tetanus of a muscle is thought to be caused by
A. high calcium ion concentrations in the sarcoplasm. B. the rapid movement of sodium ions back into the sarcoplasmic reticulum. C. an increase in stimulus strength. D. increased temperature in the active muscle. E. decreased amounts of calcium ions in muscle tissue.
An electrical impulse starting at the SA node passes through the conducting-system structures in the following order _______.
A. bundle of His>AV node>Purkinje fibers B. AV node>Purkinje fibers>bundle of His C. Purkinje fibers>AV node>bundle of His D. AV node>bundle of His>Purkinje fibers
Normal urine has a specific gravity that is ________ than the specific gravity of pure water; dehydration leads to a ________ in the specific gravity of urine.
A. lower; decrease B. higher; increase C. higher; decrease D. lower; increase