In an ectopic pregnancy,
A. no fertilization occurs.
B. implantation does not occur in the uterus.
C. a fetus never develops.
D. no placenta forms.
E. implantation occurs in the uterus.
B
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The anterior nuclei of the thalamus
A) are part of the limbic system. B) secrete pituitary hormones. C) secrete melatonin. D) receive axon collaterals from the optic nerve. E) secrete pituitary hormones and melatonin.
Through which of the following does blood return to the heart from the lungs?
A. Superior vena cava B. Inferior vena cava C. Pulmonary arteries D. Pulmonary veins E. Coronary sinus
The center of the osteon is called the ________
A) central (Haversian) canal B) perforating (Volkmann's) canal C) canaliculus D) lacuna
Alzheimer's disease is characterized by all of the following except that it
A) is the most common cause of senile dementia. B) is characterized by a progressive loss of memory. C) has a clear genetic basis. D) is associated with the formation of plaques and neurofibrillary tangles. E) may be associated with damage to the nucleus basalis.