Using a micropipette, a neuroscientist injects an axon with enough Na+ ions to move the membrane potential +25mV (from resting). What happens next?
A. Na+ channels will all be inactivated.
B. Voltage-gated Na+ will be triggered to open.
C. The neuron membrane will be hyperpolarized.
D. The membrane potential will be at the Na+ equilibrium potential.
E. None of the answer choices are correct.
Answer: B
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Which statement about sound localization is not true?
A) It requires input from both ears. B) It is difficult to discriminate sound sources in the midline. C) It requires processing at the cortical level. D) It uses time differences between sound reaching the two ears.
A muscle twitch is ________
A) the maximal force a muscle can generate B) a single contraction of skeletal muscle C) an action potential in a muscle D) a twinge that one feels in an isolated muscle
When the left and right splenius capitis contract together, the resulting movement is
A. wrinkling of the brow. B. flexion of the neck. C. elevation of the larynx. D. extension of the neck. E. pulling of the scalp anteriorly.
Only absorbed light can produce photochemical reactions that result in vision.
Answer the following statement true (T) or false (F)