The laminae of the posterior vertebral arch do not unite atthe midline in individuals with which congenital defect?
a. osteoporosis
b. spina bifida
c. rickets
d. cleft palate
b
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The space between the cheeks or lips and the teeth is called the
A) pharynx. B) larynx. C) fauces. D) vestibule. E) frenulum.
In the menstrual cycle, progesterone levels are highest during:
A) the proliferative phase. B) menses. C) the secretory phase. D) ovulation. E) both b and d
The expression "all-or-none" means that ________
A) the compound action potential in a nerve is graded B) the action potential in a neuron may be larger or smaller depending on the amount of stimulation (it is graded) C) the action potential in a neuron always has the same shape and size (amplitude) D) the compound action potential in a nerve always has the same shape and size (amplitude)
What is secreted by the liver that classifies it as an excretory organ?
A. Erythropoietin B. Digestive enzymes C. Urea D. All apply.