If you desired to control the rate of respiration voluntarily, you might __________.
a. sneeze
b. hold your breath
c. inflict pain
d. engage in an emotional experience
Answer: b. hold your breath
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The ductus arteriosus allows fetal blood to move from the
A. right atrium into the left atrium. B. aorta into the pulmonary trunk. C. left atrium into the right atrium. D. pulmonary trunk into the aorta.
Which of the following statements correctly compares water-soluble hormones with lipid-soluble hormones?
a) Both types of hormone are carried in the blood attached to a carrier protein. b) Both types of hormone almost always stimulate increases in mRNA transcription. c) Only water-soluble hormones use second messengers. d) Only water-soluble hormones require a receptor. e) Lipid-soluble hormones are not found in the bloodstream.
During the initial, depolarizing phase of the action potential, the voltage-gated Na+-channel is in which conformation?
a. closed but capable of opening b. open, or activated c. closed and not capable of opening d. activation gate open; inactivation gate closed e. activation gate closed; inactivation gate closed
The site where spinal nerves exit the vertebral column is the ________.
A. vertebral foramen B. intervertebral foramen C. intervertebral disk D. spinous process E. lamina