During exercise, cardiac output may increase by more than 170% to meet the body’s increased o₂ demands. this increase in cardiac output increases blood pressure. but the accompanying increase in arterial pressure is relatively small—only about 40%. what limits this increase in blood pressure so that it doesn’t reach dangerously high levels during exercise? a. blood vessels shorten in the contracting skeletal muscles. b. blood volume decreases due to sweating. c. vasodilation causes arterial diameter to increase in the exercising skeletal muscle. d. hematocrit decreases as more interstitial fluid enters the blood vessels.

c. Vasodilation causes arterial diameter to increase in the exercising skeletal muscle

Explanation:

Cardiac output increases blood pressure due to increased pumping action of the heart. To protect the blood pressure to rise to the fatal levels during exercise or any other activity of excessive muscle contraction, blood vessels are stimulated to dilate.

Dilation of arteries dissipates some of the blood pressure. The arteries with larger diameter have less blood pressure than the arteries with a narrow cavity under the conditions of the same cardiac output. Therefore, the dilation of arteries Dilation does not allow the blood pressure to rise to the harmful levels.

there are mainly three domains in biological classification namely; archaea, bacteria, and eukarya.

archaea includes all the prokaryotic cells which are characterized by their lipid membranes. they have branched hydrocarbon which is attached to glycerol through an ether linkage.

bacteria includes all the prokaryotic cells, the cell membrane of which are made up of the unbranched fatty acid chain. in addition, they are attached to glycerol through an ester bond.

eukarya includes all the eukaryotic cells, that is, the cells contain a nucleus and other membrane-bound cell organelles.

they can be autotrophic as well as heterotrophic, unicellular as well as multicellular

they include kingdoms like protista, plantae, animalia, fungi et cetera.

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explanation:

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds