Which statement is correct regarding brain development and aging?
A. The brain becomes smaller but denser and more efficient over time.
B. The brain grows, taking up double the amount of space between the brain and the skull.
C. The structure, function, and number of neurons in the brain are significantly reduced.
D. Blood flow is reduced within the brain, and less glucose and oxygen are used.
Answer: D
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An odor molecule is to __________ as a transmitter substance is to __________
a. the olfactory mucosa; the neuron b. the odor receptor molecule; the postsynaptic receptor c. potassium ions; sodium ions d. excitation; reuptake e. olfactory nerve; synapse
What infrequently used test is most often performed between the 8th and 11th week of pregnancy but produces a risk of miscarriage of 1 in 100 to 1 in 200 pregnancies?
a) amniocentesis b) ultrasound sonography c) chorionic villus sampling (CVS) d) first-trimester screen