Which of the following structures is considered part of the upper respiratory tract?
A. Alveoli
B. Bronchi
C. Pharynx
D. Lungs
Answer: C
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Which correctly describes the cause of the increase in alveolar ventilation that occurs when a person ascends to high altitude?
A. The decrease in PCO2 of inspired air decreases alveolar PCO2, stimulating the central chemoreceptors. B. The decrease in total atmospheric pressure causes a greater negative pressure in the intrapleural space, resulting in deeper and more frequent breathing. C. The decrease in PCO2 of inspired air decreases alveolar PCO2, stimulating the peripheral chemoreceptors. D. The decrease in PO2 of inspired air decreases alveolar and arterial PO2, stimulating the peripheral chemoreceptors. E. The decrease in the total barometric pressure at high altitude causes hypocapnea, which stimulates peripheral chemoreceptors.
The total load of ____________________ ions determines the total amount of water that will be retained in the ECF by osmosis
Fill in the blank(s) with correct word
The figure illustrates keratinization in the epidermis. What layer of the epidermis is "C"?
A. stratum spinosum B. stratum lucidum C. stratum basale D. stratum corneum E. stratum granulosum
Which of the following is true regarding unmyelinated nerve fibers in the PNS?
A) An oligodendrocyte cells wraps its plasma membrane around each fiber as it does with myelinated fibers. B) A Schwann cells wraps its plasma membrane around each individual fiber as it does with myelinated fibers. C) Satellite cells cluster around each axon to form a pseudo-myelin sheath. D) A Schwann cell folds its plasma membrane around several fibers .