Which is not a change associated with the aging of the respiratory system?
A. Decrease in the ventilation rate
B. Reduction in the number of alveoli
C. Accumulation of carbon, dust, and pollution in the lungs
D. Reduction in the amount of gas that can be exchanged
E. Increase in the elastic connective tissue in the lungs and the thoracic cavity wall
Answer: E
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The physical mechanism responsible for blushing is
A) cyanosis. B) an increased amount of melanin. C) dilation of superficial blood vessels. D) decreased amounts of carotene. E) None of the answers are correct.
Which statement about CO2 is incorrect?
A) Its concentration in the blood is decreased by hyperventilation. B) Its accumulation in the blood is associated with a decrease in pH. C) More CO2 dissolves in the blood plasma than is carried in the RBCs. D) CO2 concentrations are greater in venous blood than arterial blood.
The ________ surface is the aspect of the tooth that faces the cheek
Fill in the blank(s) with correct word
The oral phase of swallowing is under ________ control and the pharyngo-esophageal phase is ________
A) voluntary; also voluntary B) involuntary; also involuntary C) central nervous system; controlled by autonomic reflexes D) central nervous system; also controlled by the central nervous system E) autonomic nervous system; controlled by autonomic reflexes