What structure is known as the "pacemaker" of the heart because it starts the action potential that triggers each heartbeat?
A. atrioventricular (AV) node
B. sinoatrial (SA) node
C. Purkinje fibers
D. Bundle of His (AV bundle)
Answer: B. sinoatrial (SA) node
Anatomy & Physiology
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Fill in the blank(s) with correct word
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Nitric oxide (NO) interferes with platelet function and blood clotting
Indicate whether the statement is true or false
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Lymph in the cisterna chyli differs in composition from lymph in the general lymphatic stream in that it contains more ________
A) fat B) ions C) protein D) nucleic acids
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With what portion of the brain is the pituitary associated?
A. Thalamus B. Cerebrum C. Cerebellum D. Hypothalamus
Anatomy & Physiology