Which of the following carry oxygen-poor blood?
A. Venae cavae and pulmonary arteries
B. Pulmonary veins and pulmonary arteries
C. Aorta and pulmonary veins
D. Aorta and vena cavae
E. Pulmonary veins and vena cavae
Answer: A
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Which pairing is most out of place with reference to thermoregulation?
a. Increased muscle tone, vasoconstriction b. Decreased voluntary exercise, nonshivering thermogenesis c. Vasodilation, sweating d. Shivering, vasoconstriction e. Decreased muscle tone, cool clothing
During periods of activity, when the heart rate is rapid, the mean arterial pressure in humans is
A) 2/3 diastolic pressure and 1/3 systolic pressure. B) 1/3 diastolic pressure and 2/3 systolic pressure. C) 1/2 diastolic pressure and 1/2 systolic pressure. D) Approximately equal to systolic pressure.
Which structure attaches the tongue to the floor of the oral cavity?
A) lingual frenulum B) papillae C) vestibule D) soft palate
Which letter is associated with a zone (in a relaxed muscle) that is a little more lightly shaded because only thick filaments are present?
A. M B. A C. Z D. I E. H