What lymphatic tissue in the submucosa of the small intestine prevents bacteria from entering the blood?
a. Peyer's patches
b. rugae
c. appendix
d. circular folds (plicae circulares)
e. lacteals
a. Peyer’s patches
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Which statement accurately describes alveolar and systemic gas exchanges?
A. In both alveolar and systemic gas exchange, oxygen diffuses out of the blood. B. In both alveolar and systemic gas exchange, oxygen diffuses toward the blood. C. In alveolar gas exchange oxygen diffuses into the blood, but in systemic gas exchange it diffuses out of the blood. D. In alveolar gas exchange oxygen diffuses out of the blood, but in systemic gas exchange it diffuses into the blood.
A molecule referred to as highly soluble is
A) very likely to dissolve in water. B) not very likely to dissolve in water. C) not very likely to dissolve in water and is called aqueous. D) called aqueous. E) very likely to dissolve in water and is called aqueous.
What action causes the second heart sound heard through a stethoscope?
A) Opening of the atrioventricular valves B) Opening of the semilunar valves C) Closing of the atrioventricular valves D) Closing of the semilunar valves
Which of the following is not involved with spinal gating of pain signals?
A) Lower motor neurons B) The spinothalamic tract C) Second-order neurons D) The reticulospinal tract E) Nociceptors