All visual pigments contain __________ derived from __________.
-retinal; vitamin A
-rhodopsin; vitamin A
-retinal; vitamin D
-rhodopsin; vitamin D
retinal; vitamin A
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The more movable end of a muscle is its
A. insertion. B. fulcrum. C. source. D. origin.
Which of the following statements is true? The stimulation of beta-adrenergic receptors can lead to 1. an increase in metabolic activity. 2. contraction of airway smooth muscle. 3. the breakdown of triglycerides within adipocytes
A) 1 B) 2 C) 3 D) 1 and 3 E) 1, 2, and 3
All cardiac veins empty into the ________, which then empties into the ________.
A. great cardiac vein; superior vena cava B. coronary sinus; right atrium C. coronary sinus; left atrium D. great cardiac vein; right atrium E. inferior vena cava; left atrium
The atrioventricular valve between the left atrium and the left ventricle is known as the ____ valve
a. tricuspid b. bicuspid c. pulmonary d. aortic