Sickle cell disease is caused by
A) a lack of intrinsic factor. B) an excess of hemoglobin.
C) a mutation. D) a lack of dietary iron.
C
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In the systemic circulation, the PO2 of arterial blood exceeds the PO2 of venous blood, while the reverse is true for the pulmonary circulation.
Answer the following statement true (T) or false (F)
The common name for the patella is the
A) forehead. B) knee. C) heel. D) palm of the hand. E) chin.
Another term for platelets is:
a. erythrocytes b. leukocytes c. thrombocytes d. fibrinogen
The adaptive significance of the crossed extensor reflex when a person steps on a tack is to
A. slow the rate of removal of the foot from the tack. B. prevent the person from falling down. C. reduce the pain sensations. D. remove the foot from the tack. E. increase the rate at which withdrawal of the limb occurs.