Arteries can constrict or dilate as needed because of the smooth muscle found in the tunica intima.
The vascular smooth muscle extends in response to an increase in perfusion, which narrows the artery. Vasodilation is the widening or expansion of the blood vessels.
If there is a decrease in pressure to the arteriole, then there is decreased stretching of the smooth muscle, leading to the relaxation of the smooth muscles and dilation of the arteriole. When the smooth muscles in the blood vessel walls contract, it occurs. The blood vessels that carry blood to the skin typically contract or narrow in reaction to cold temperatures, which reduces the blood vessel opening.
Vasoconstriction, a result of this reaction, reduces blood flow to the skin, minimizing heat loss from the heated blood and maintaining a normal internal or "core" temperature.
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Answer:
The skinfold method, the measurement of subcutaneous fat folds, is the most widely adopted field method for the assessment of body fat, especially in children.
It is based on the principle that fat is of a known density and by “summing” measurements of subcutaneous fat thickness across the body, total and regional fat can be estimated.
Skinfold thickness measurements are typically used to rank individuals in terms of relative total “fatness”, or to assess subcutaneous fat at various regions of the body.
Population specific equations are used to derive estimates of percent body fat.
In infancy, it might be the sole tool available for assessing body composition longitudinally as other methods may not be feasible, or may only be suitable for use at body sizes e.g. PEA POD, can only measure infants up to 10kg.
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Answer:
That is correct, also amino acids are monomers (building blocks) of proteins (1 of the 4 biomolecules).