Which of the following statements about adrenergic receptors is true?
A) They are proteins in the plasma membrane.
B) When activated, cAMP levels are affected.
C) Epinephrine activates both alpha and beta types.
D) Norepinephrine activates mainly the alpha type.
E) All of the answers are correct.
Answer: E
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Which of the following statements is false?
A) Chemical reactions proceed more quickly at higher temperatures. B) Chemical reactions progress at a faster rate when the reacting particles are present in higher numbers. C) Larger particles move faster than smaller ones and thus collide more frequently and more forcefully. D) Catalysts increase the rate of chemical reactions
The two major control systems of the body are the ____________________ and the ____________________
Fill in the blank(s) with correct word
0.12 to 0.20 second is the duration of the ________ in a normal heart.
A. diastole B. P-R interval C. Q-T interval D. QRS wave
During isovolumetric ventricular relaxation ________.
A. left ventricular pressure exceeds aortic pressure B. ventricular pressure is increasing C. the atrioventricular valves are open D. atrial pressure is less than ventricular pressure