Which is TRUE about the muscle fibers found in a muscle spindle?
A. Their contraction is stimulated by alpha motor neurons and inhibited by gamma motor neurons.
B. When stimulated to fire, they always inhibit flexor muscles.
C. They function to maintain tension on spindle receptors.
D. They are not true muscle fibers because they cannot contract.
E. They are innervated by alpha motor neurons.
Answer: C
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What is chloride shift?
A. An exchange that maintains the ionic balance between the red blood cells and the plasma B. Movement of chloride into cerebrospinal fluid, allowing its interaction with peripheral chemoreceptors C. The type of reaction catalyzed by carbonic anhydrase D. Movement of chloride across the respiratory membranes, decreasing oxygen delivery to tissues
Which of the following statements is true about voltage-gated K+ channels?
A) They are triggered to open at voltages near the Na+ equilibrium potential. B) They are triggered to open at voltages near the resting membrane potential. C) They are triggered to open at voltages near the threshold potential. D) They are triggered to open at voltages below the resting membrane potential.
The molecular formula H2O means
A. 1 hydrogen atom and 1 oxygen atom. B. 1 hydrogen atom and 2 oxygen atoms. C. 2 hydrogen atoms and 2 oxygen atoms. D. 2 hydrogen atoms and 1 oxygen atom. E. None of the choices are correct.
When doing a pushup, your shoulders ________ as your body is pushed upward.
A. supinate B. hyperextend C. protract D. elevate E. retract