Blood spurts back into the _____________ when the right atrium contracts.
a. aorta
b. pulmonary trunk
c. venae cavae
d. pulmonary veins
Answer: c. venae cavae
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The ____ bears the majority of the weight.
Fill in the blank(s) with the appropriate word(s).
Assuming you have normal respiratory function at sea level, start holding your breath. Which of the following could be true in 60 seconds?
A. The oxygen-hemoglobin dissociation curve is shifting to the left B. Venous PO2 = 50 mmHg C. Arterial PCO2 = 50 mmHg D. Alveolar PO2 = 105 mmHg
Peptide hormones are synthesized by cytoplasmic ribosomes as active enzymes
Indicate whether the statement is true or false
Cardiac reserve is
A. the increase in cardiac output an individual is capable of demonstrating during vigorous exercise. B. the blood that the heart uses to nourish its cardiac muscle and does not put into general circulation. C. the potential increase in stroke volume someone would show if they engaged in athletic training. D. the amount of blood left in the heart after the ventricle has contracted during cardiac cycles at rest.