The amount of air left in the lungs even after the most forceful expiration is referred to as the _________ volume
Fill in the blank with correct word.
residual
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Myocardial cells can generate action potentials spontaneously because they have
A) L-type Ca2+ channels. B) permanently open channels for Na+ and K+. C) a net influx of Na+. D) prolonged Ca2+ influx. E) unstable ion channels.
Which of the following would be classified as an innate physical barrier?
A. activation of complement B. phagocytosis of invading organisms C. washing action of tears and saliva D. inflammation E. release of histamine
Which of the following statements concerning red blood cells is false?
A) Red cells are biconcave discs. B) Red cells lack mitochondria. C) Red cells are about 18 µm in diameter. D) Red cells are specialized for carrying oxygen. E) Red cells can form stacks called rouleaux.
Most of the nail body appears pink because of the blood in the underlying capillaries.
Answer the following statement true (T) or false (F)