Extending from the ethmoid bone are the
A. superior conchae.
B. middle conchae.
C. inferior conchae.
D. a and b
E. a, b, and c
Answer: D
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Down syndrome (trisomy-21) results from __________.
A. a mutagen B. nondisjunction C. a teratogen D. a sex-linked mutation E. an autosomal recessive allele
Predict which way exercise would shift the oxygen-hemoglobin dissociation curve. Would this shift in the curve increase or decrease hemoglobin saturation?
A. The curve would shift to the right thus decreasing the hemoglobin saturation. B. The curve would shift to the right thus increasing the hemoglobin saturation. C. The curve would shift to the left thus increasing the hemoglobin saturation. D. The curve would shift to the left thus decreasing the hemoglobin saturation.
Stenosis (constriction) of the pyloric sphincter would interfere with
A. peristalsis. B. passage of chyme into the duodenum. C. mucus secretion. D. passage of bile and pancreatic juice into the duodenum. E. passage of a bolus into the stomach.
Regurgitation of blood flow through the aortic semilunar valve would give rise to
A. the first heart sound. B. end-systolic volume. C. an extra heart beat. D. the second heart sound. E. a heart murmur.