Each of these statements is true except one. Identify the exception.
A) Activation of ? receptors opens Na+ channels in the membrane.
B) ?2 receptors are not innervated by sympathetic neurons, so are more sensitive to epinephrine, delivered via the blood.
C) ?1 receptors respond equally well to both epinephrine and norepinephrine.
D) Monoamine oxidase is the main enzyme responsible for the degradation of catecholamines.
A) Activation of ? receptors opens Na+ channels in the membrane.
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Determine the polysynaptic reflex from this list of examples
A) jaw-jerk reflex B) patellar (knee-jerk) reflex C) simple stretch reflex D) flexion (withdrawal) reflex
The receptors that are stimulated when blood PO2 drops below 60 mm Hg are located in the
a. respiratory center of the brain. b. carotid and aortic bodies. c. tissue capillaries. d. two of these answers are correct. e. all of these answers.
Which of the following combining forms means male?
A. vas/o B. andr/o C. crypt/o D. orchid/o
Which of these vessels would blood from the cranial vault NOT pass through as it returned to the heart?
A. external jugular veins B. internal jugular veins C. subclavian veins D. brachiocephalic veins E. neither external jugular veins nor subclavian veins.