The entrance of ________ into the presynaptic neuron triggers the release of a neurotransmitter.
A. electrons
B. potassium ions
C. calcium ions
D. sodium ions
Answer: C
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An action potential does not re-stimulate the adjacent membrane that was previously depolarized because
A. stimulation is inhibited by the myelin sheath. B. that area of the membrane is in the absolutely refractory period. C. the resting membrane potential of the axon is too negative. D. the resting membrane potential of the axon is too positive. E. it is impossible for an action potential to be propagated along an axon toward the nerve cell body.
Define systole
What will be an ideal response?
The decidua basalis is ________
A) still in the uterus after birth B) located between the developing embryo and myometrium C) not a maternal contribution to the placenta D) None of the listed responses is correct.
The fibrocartilage located between the bodies of adjacent vertebrae is the ________.
A. intervertebral disk B. lamina C. intervertebral foramen D. spinous process E. vertebral foramen