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:
C. come from other cells.
Explanation:
Its determined by its primary structure
House Cat: Felis catus
Mountain Lion: Felis concolor
Domestic dog: Canis lupus familiaris
Human: Homo sapiens
Explanation:
- The cat (Felis catus) is a kind of domestic species of small carnivorous mammal. It is the only domestic species in the family Felidae and is often referred to as the domestic cat to get varied from the wild members of the family.
- The mountain lion's scientific name is Puma concolor,
- The domestic dog is a member of the family with genus Canis (canines), which forms a basic part of the wolf-like canids, and is the most widely abundant terrestrial carnivore.
- Humans belong to a family called Homo sapiens.
Most rainforests are structured in four layers: emergent, canopy, understory, and forest floor. Each layer has unique characteristics based on differing levels of water, sunlight, and air circulation.