<span>Blood vessels are dilated to increase the amount of oxygen carried in the blood, and the lungs work harder to meet the body's oxygen demands.
Blood volume increases during exercise, making the body more efficient, so it is not necessary for the lungs to work as hard.
The lungs determine the speed at which the heart pumps, so blood flows at a level that accommodates oxygen absorption in the muscles.
The lungs expand and contract, which increases the rate of blood flow so the muscles can
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Answer:
The correct answer is : low lying.
Explanation:
Placenta is generally characterized on the basis of the degree of coverage to the internal os that are as given below:
Total placenta previa, in this the the placenta covers the cervical os where as the partial placenta previa the internal os is covered partially by the placenta.
Marginal placenta is present on the margin or edge of cervical os and in low lying it is present near but not reach it.
Thus, the correct answer is : low lying
Answer:
The three specialized systems routes are the coronary circulation, which brings blood to the myocardium; the portal circulation, which takes blood from the organs of digestion to the liver through the portal vein and the fetal circulation in which the fetus obtains oxygen and nutrients from the Mother's blood.
Explanation:
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