Which fat-soluble vitamin is synthesized in skin that is exposed to sunlight?
Which fat-soluble vitamin is synthesized in skin that is exposed to sunlight?
A) vitamin K
B) vitamin E
C) vitamin B6 (pyridoxine)
D) vitamin D
E) vitamin C
D) vitamin D
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Which of the following affect heart rate through the use of a cAMP second-messenger system?
A) norepinephrine B) epinephrine C) acetylcholine D) epinephrine and norepinephrine E) acetylcholine, epinephrine and norepinephrine
Name the two large veins that collect blood from the systemic circuit
A) thoracic aorta and abdominal aorta B) ascending aorta and descending aorta C) superior vena cava and inferior vena cava D) external jugular vein and internal jugular vein E) brachiocephalic vein and subclavian vein
Muscarinic receptors bind ________.
A. acetylcholinesterase B. epinephrine C. monoamine oxidase (MAO) D. norepinephrine E. acetylcholine