A person with a systolic blood pressure of 120 mm Hg and a diastolic blood pressure of 80 mm Hg typically has a mean arterial blood pressure of 90 mm Hg. Which of the following offers the best explanation for why the mean arterial blood pressure is 90 mm Hg, and not the average of the two pressures (100 mm Hg)?
a. The systolic blood pressure is higher than the diastolic blood pressure.
b. The quantity of fluid in the person's circulatory system must be greater during the diastole.
c. The diastole of the heart lasts longer than the systole of the heart.
d. The systolic blood pressure is not as high as the diastolic blood pressure.
e. Angiotensin, produced from a blood protein by renin, elevates the diastolic blood pressure.
Ans: c. The diastole of the heart lasts longer than the systole of the heart.
You might also like to view...
Which phrase would most likely be used in a discussion of homeostasis?
a. respond to environmental stimuli b. limited range of variation c. rapid energy turnover d. cycle of elements e. structural and functional units of life
Sensory pathways of smell and taste ____
a. begin with chemoreceptors b. begin in the somatosensory cortex c. are not involved in communication d. are integrated with the advanced vomeronasal organ that humans possess e. are completely separated from one another
Ectomycorrhizae:a
form arbuscules. b. are intracellular. c. coat the plant root. d. have glomeromycetes as the fungal component. e. supply plants with organic molecules.
Bonds between which groups stabilize the structure of many proteins, including those that make up human hair?
A. Aldehyde B. Sulfhydryl C. Hydroxyl D. Methyl E. Carbonyl