The ________ is the pacemaker of the heart
A) atrioventricular node
B) sinoatrial node
C) atrioventricular bundle
D) autonomic nervous system
B
Explanation: Correct. The sinoatrial node initiates a heartbeat.
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Which statement about gender and CVD is true?
A) CVD kills more men than women. B) CVD kills more women than men. C) Women are less likely than men to die within a year of having a heart attack. D) Women are more likely to die of breast cancer than a heart attack.
Which of the following statements is TRUE about B-1 B cells and MZB cells?
A. Both are self-renewing in the periphery, not requiring replacement from bone marrow. B. Both can respond to TI antigen. C. Both do not undergo SHM. D. Both A and B E. All of the above
Which of the following does a commercial weight-loss program typically NOT provide?
A. behavior modification advice B. group support C. physical activity recommendations D. a physician who conducts a medical evaluation before you begin
Studies suggest that elevating the levels of ________ in the brain can contribute to "central" fatigue during prolonged endurance events.
A. norepinephrine B. serotonin (5-hydroxytryptamine) C. acetylcholine D. epinephrine