Oxygen binds to which of the following components of hemoglobin?
A. Beta chain
B. Iron
C. Alpha chain
D. Copper
Ans: B. Iron
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One function of the brain's frontal lobe is
A. smell. B. verbal communication. C. hearing. D. speech interpretation. E. vision.
The pericardium lies within the ________, a portion of the thoracic cavity that lies between the left and right pleural cavities.
Fill in the blank(s) with the appropriate word(s).
Which statement is the best reason for an elevated white blood cell count?
A) Patient is having sudden, extreme hemorrhaging.
B) Patient is dehydrated.
C) Patient is anemic.
D) Patient has a systemic bacterial infection.
Parathyroid hormone functions to increase calcium ion levels in blood. If its secretion is regulated through negative feedback, under which conditions would this hormone normally be released?
A. Parathyroid hormone secretion increases in the morning and decreases in the afternoon. B. Parathyroid hormone secretion occurs when blood calcium levels are too high. C. Parathyroid secretion is constant to maintain blood calcium levels. D. Parathyroid hormone secretion occurs when blood calcium levels are too low.