Why is it difficult for "weightless" astronauts in space to know whether they are right side up or upside down?
A) They can't see a horizon.
B) The direction in which they are traveling changes rapidly.
C) Maculae that report head position depend upon the gravitational pull on the otoliths.
D) Sunrise and sunset are no longer linked to a 24-hour day.
Answer: C
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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
The end of the aorta occurs when the vessel bifurcates into the
A. brachiocephalic artery. B. subclavian arteries. C. common iliac arteries. D. common carotid arteries. E. None of these answers is correct.
Specific patterns of stimulation of the reticular formation in the mesencephalon produce a variety of ________ responses.
Fill in the blank(s) with the appropriate word(s).
Female oxen are used more often than mules
Indicate whether the statement is true or false