Rapid defibrillation is important because it contributes greatly to the survival of sudden cardiac arrest patients by eliminating abnormal hearth rhythm. Research has shown that the only proven, effective treatment for sudden heart attack is prompt defibrillation which is applied within the first few minutes of attack.
Explanation:
Greenhouse effect, a warming of Earth's surface and troposphere (the lowest layer of the atmosphere) caused by the presence of water vapour , carbon dioxide, methane, and certain other gases in the air. Of those gases, known as greenhouse gases, water vapour has the largest effect.
ANSWER:
The correct answer would be "to withstand the pressure of the blood that is being pumped by the heart".
Arteries are the type of blood vessels which carry blood away from the heart to rest of the body.
Thus, the blood which enters the arteries usually has high pressure due to the pumping of the heart.
To withstand and absorb this pressure, arteries usually have thick layers of muscular and elastic fibers in their structure as compared to the veins.
The wall of the arteries swells and expand due to the force generated with each contraction of the heart and then the arteries contract back which helps in pushing the blood forward.
Closed Circulatory system in which the blood is confined to
vessels and is kept separate from the intestinal fluid. Closed
systems are more efficient at transporting circulatory fluids to tissues and
cells. chemical exchanges occurs
between blood and intestinal fluid, as well as between intestinal fluid and
body cells.
