The first heart sound (the "lub" of the "lub-dup") is caused by __________.
opening of the atrioventricular valves
closure of the atrioventricular valves
opening of the semilunar valves
closure of the semilunar valves
closure of the atrioventricular valves
Anatomy & Physiology
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When body temperature rises, a center in the brain initiates physiological changes to decrease the body temperature. This is an example of
A) negative feedback. B) positive feedback. C) nonhomeostatic regulation. D) diagnostic regulation. E) fever.
Anatomy & Physiology
Which would be a normal hematocrit value for a healthy adult male?
A) 35 B) 50 C) 65 D) 60
Anatomy & Physiology
Which of the following is most synonymous with the term ectotherm?
A) Heterotherm B) Poikilotherm C) Endotherm D) Pseudotherm
Anatomy & Physiology
Which of the following is best for viewing bones?
A) X-rays B) ultrasound C) CAT D) PET E) MRI
Anatomy & Physiology