In order to trigger the release of neurotransmitter from a neuron terminal, calcium ions
A. bind to ion channels on the neuron membrane and cause them to open for the transmitter.
B. bind to proteins on the surface of synaptic vesicles.
C. exit the synaptic knob through diffusion.
D. penetrate the synaptic vesicles and bind to molecules of neurotransmitter.
Answer: B
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Atrial natriuretic hormone
A. is secreted when atrial blood pressure decreases. B. causes the formation of concentrated urine. C. promotes the secretion of ADH. D. is secreted when atrial blood pressure increases. E. is secreted by the posterior pituitary.
Which of the following muscles of the neck tilts the head down and toward the side?
A) scalenes B) sternocleidomastoid C) splenius capitis D) semispinalis
The actual contractile units of muscles extend from Z disc to Z disc. They are ________
A) sarcomeres B) sarcoplasmic reticulum C) thick filaments D) myofibrils
Another name for the Haversian system is:
a. central canal b. lacunae c. canaliculi d. osteon