a.
To explain: The importance or function of high elastic fiber content in the aorta.
Concept introduction: Aorta is the largest artery of the body. It starts from the top of the left ventricle. The aortic valve of the aorta receives blood from the left ventricle and carries oxygenated blood from the heart to all parts of the body through systemic circulation. There are four sections of aorta namely ascending aorta, aortic arch, descending thoracic aorta, and abdominal aorta.
b.
To explain: The importance or function of smooth muscle in the arterioles.
Concept introduction: An arteriole is the smallest vessel of the microcirculation. It branches out from the artery and leads to capillaries. The artery carries oxygenated blood to the capillaries; from the capillaries, it is passed to the venules.
c.
To explain: The importance or function of extensive capillaries in the liver and lungs.
Concept introduction: Capillaries are the small blood vessels in the body. They help to circulate blood between the arterioles (small blood vessel from artery that leads to capillary for microcirculation of blood) and venules (small vessels that connect the capillaries and veins). They also help to pass the nutrients and
d.
To explain: The importance or function of valves in the leg veins.
Concept introduction: Blood is a fluid connective tissue that carries oxygen, glucose, and nutrients throughout the body. Veins are type of blood vessels that carry blood to the heart from the body.
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