A rise in arterial PCO2 elevates carbon dioxide levels in cerebrospinal fluid and stimulates the chemoreceptive neurons of the medulla to produce __________.
a. eupnea
b. a decrease in rate and depth of breathing
c. hypercapnia
d. an increase in rate and depth of breathing
Answer: d. an increase in rate and depth of breathing
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Which of the following statements about hormones is correct?
A. All hormones secreted by the anterior and posterior pituitary glands are peptides. B. Anterior pituitary hormones are synthesized in the hypothalamus. C. Only steroid hormones can regulate the secretion of steroid hormones. D. All of the hypophysiotropic hormones are peptides. E. IGF-1 stimulates growth by increasing growth hormone secretion through positive feedback.
Which of the following is an example of diffusion??
A) ?Inhalation of air into the lungs B) ?Build-up of carbon dioxide in the cells C) ?Warming and moistening of inhaled air before it passes to the alveoli D) ?Passage of oxygen from the alveoli to the blood
What is the name of the structure that connects the left and right cerebral hemispheres, allowing for interhemispheric communication?
A) cerebral cortex B) corpus callosum C) internal capsule D) lateral ventricles
Estrogen exerts a ________ influence on the hypothalamus, increasing secretion of ________ and thus increasing LH and FSH secretion.
A. negative; GnRH B. positive; progesterone C. negative; progesterone D. positive; GnRH