Im so confused i would help you i just need a better understanding.<span />
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: While the moon and sun cause tides on our planet, the gravitational pull of these celestial bodies does not dictate when high or low tides occur. Tides originate in the ocean and progress toward the coastlines, where they appear as the regular rise and fall of the sea surface.
Explanation:
Compound microscope is commonly used in the schools and colleges. It has two lenses, the objective lens and the ocular lens. It provides a magnification of 1500X. Eyepiece lens is of 10X or 15X power. It is used to observe bacterial, protozoa, various cells, etc.
Dissecting Microscope It is also called stereo microscope. Its magnification power is less than the other microscope. It gives a 3 dimensional picture. Due to the low magnifying power they are used to observe little bigger objects than other microscopes. They are used in the surgeries, dissection, forensic science etc.