The ________ method of birth control involves taking either combination estrogen/progesterone birth control pills or progesterone-only pills in two large doses 12 hours apart within 72 hours of unprotected sexual intercourse
A) oral contraceptive
B) progesterone-only
C) intrauterine device
D) rhythm method
E) hormonal post-coital contraception
Answer: E
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At what developmental stage do red blood cells leave the bone marrow and enter the circulating blood?
A. Erythroblast B. Precursor cell C. Reticulocyte D. Erythrocyte E. Myeloblast
The energy currency of the cell is a molecule called ________.
A. fat B. glucose C. ADP D. pyruvate E. ATP
Agglutinogens are contained on the __________, whereas the agglutinins are found in the __________.
a. cell membrane of the RBC; plasma b. plasma; cell membrane of the RBC c. nucleus of the RBC; mitochondria d. mitochondria; nucleus of the RBC
During the relative refractory period of an action potential, a larger than normal stimulus is needed to cause another action potential. This is due to the fact that ________
A) the voltage gated potassium ion channels remain open long enough to hyperpolarize the axon membrane B) the membrane is now impermeable to all ions C) the sodium potassium pump will stop working during relative refractory D) the inactivation gates on voltage gated sodium ion channels are closed