An educated speculation or a possible answer to a question is called a(n) ________
A) hypothesis
B) fact
C) scientific method
D) law
E) theory
A
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A person having valve replacement surgery is reviewing the cardiac cycle. Which valve has to function at maximum level to ensure that oxygenated blood moves through the general circulation?
A) Mitral B) Pulmonary C) Aortic D) Tricuspid
Converted to its active form in the lung capillaries, the hormone ________ stimulates the suprarenal production of aldosterone.
Fill in the blank(s) with the appropriate word(s).
Many athletes train at higher altitudes immediately prior to an athletic competition. Select the scenario that correctly identifies how acclimatization to a higher elevation would improve endurance performance.
A. A hypoxic ventilatory response occurs that remains in place for a few weeks after returning to a lower altitude. B. Increased ventilation at the higher altitudes will improve tidal volume when returning to the lower altitude. C. Erythropoietin release will increase; consequently, the athlete will have a greater aerobic capacity when returning to the lower altitude. D. Hemoglobin's affinity for oxygen will increase; therefore, tissues will receive more oxygen during exercise.
Which prenatal structure forms the ascending aorta and pulmonary trunk?
A. Truncus arteriosus B. Primitive ventricle C. Primitive atrium D. Sinus venosus E. Conus cordis