Near the end of the first trimester, deoxygenated blood flows from the developing embryo or fetus to the placenta through
A) paired umbilical veins.
B) the superior vena cava.
C) one umbilical vein.
D) three umbilical arteries.
E) paired umbilical arteries.
E) paired umbilical arteries.
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Which event marks the beginning of the cardiac cycle?
A) ventricular systole B) atrial diastole C) atrial arrhythmia D) ventricular diastole E) atrial systole
Kidneys maintain acid-base balance in the body by
a. removing hydrogen ions from all the sources in the body. b. excreting bicarbonate ions rapidly when acidity of body fluid decreases. c. secreting ammonia into the urine. d. removing hydrogen ions and secreting ammonia into the urine. e. removing hydrogen ions, secreting ammonia into the urine, and excreting bicarbonate ions when body fluid acidity decreases.
From this list of cranial nerves:
1. olfactory (I) 2. optic (II) 3. oculomotor (III) 4. abducens (VI) 5. vestibulocochlear (VIII) Select the nerves that are sensory only. A) 1,2,3 B) 2,3,4 C) 1,2,5 D) 2,3,5 E) 3,4,5
One strategy to prevent AIDS transmission is to be sure to use birth control pills when engaging in sexual intercourse.
a. true b. false