Answer:
A. oxygen
Explanation:
element in magma is most abundant is oxygen.
<span>reaction of CO2 and H2O</span>
Radioisotopes tell scientists that the earth is 4.5 billion years old.
Easy 5 points. Stop, Drop, and Roll. In that order.
Answer:
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.
