Calcitonin
A. lowers the metabolic rate.
B. is produced by the parathyroid gland.
C. is produced by the thyroid gland.
D. is produced by the parathyroid gland and lowers the metabolic rate.
Answer: C
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Mucus is moved along the lining of the trachea by extensions from cell membranes known as
A. cilia. B. flagella. C. microvilli. D. stereovilli.
The negative sign in front of the acceleration due to gravity (-9.81 m/s 2 ) can mean which of the following?
A. the projectile is traveling down and speeding up (negative direction) B. the projectile is traveling up and slowing down (negative acceleration) C. both A and B D. none of the above
The adaptive significance of the crossed extensor reflex when a person steps on a tack is to
A. slow the rate of removal of the foot from the tack. B. prevent the person from falling down. C. reduce the pain sensations. D. remove the foot from the tack. E. increase the rate at which withdrawal of the limb occurs.
The type of neuronal circuit that spreads information from one presynaptic neuron to several postsynaptic neurons is a ________ circuit.
A. diverging B. converging C. reverberating D. parallel-after-discharge E. None of the choices is correct.