SI worksheet 16 answers - SIworksheet16 , a diffusion b...

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SI worksheet 16  In the alveoli and lung capillaries, carbon dioxide and oxygen are exchanged by means of _____. a. diffusion b. active transport c. endocytosis d. pinocytosis e. osmosis For a body surface to be a respiratory surface, it must _____. a. be dry and covered with hair b. be moist and glandular c. have a large surface area d. be thin and moist e. be internal The primary sealant(s) that plug(s) leaks in damaged blood vessels is/are _____. a. fibrin b. red blood cells c. white blood cells d. platelets e. hemoglobin Which of the following decreases blood pressure? a. vasodilation b. vasoconstriction c. the peptide endothelin d. contraction of the ventricles of the heart e. All of the listed responses are correct. The maximum amount of air a person can exhale, after maximal inhalation, is called  _____. a. vital capacity b. tidal volume c. residual capacity d. ventilation volume e. end tidal volume What happens when the CO2 level from cellular respiration increases in the blood? a. Cellular respiration decreases. b. A decrease in the pH of the cerebrospinal fluid triggers the brain's breathing  control centers, which stimulate diaphragm and rib muscle contractions.
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c. The pH of the cerebrospinal fluid also increases and is detected by O2 sensors in  arteries near the heart. d. The O2 level automatically increases. e. The medulla, moderated by the pons, signals the heart muscle to beat harder,  bringing in more O2.
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