The partial pressure of oxygen (PO2 ) in a pulmonary capillary is about 40 mm Hg. Determine the partial pressure that will promote movement of oxygen into the pulmonary capillary from air in the alveolus
A) 18 mm Hg B) 35 mm Hg C) 104 mm Hg D) 40 mm Hg
Answer: C
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Among the three categories of lymphocytes, it is the _____________ killer cells that attack abnormal and infected tissue cells
Fill in the blank with correct word.
The ability of an organism to sense and react to changes in its body illustrates
A) responsiveness. B) absorption. C) circulation. D) respiration.
The process of tissue death in which cells swell, rupture their membranes, and burst is called ________.
A. transcytosis B. necrosis C. phagocytosis D. apoptosis
Drugs called calcium channel blockers may be used to lower blood pressure by causing arteries to vasodilate. How do you suppose these drugs work?
A. They prevent calcium from entering the sarcoplasmic reticulum of smooth muscle. B. They prevent calcium from entering cardiac muscle, thus slowing down the heart rate. C. They prevent calcium from entering smooth muscle, thus allowing the muscle to relax. D. They prevent calcium from exiting the sarcoplasmic reticulum in skeletal muscle. E. They stimulate the calcium pump in smooth muscle, thus removing calcium from the calmodulin.