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Arteries have thick elastic layers in their walls; those closest to the heart have thicker layers than the rest. Which of the following statements about this layer is correct? 1
By the end of this section, you will be able to: Compare and contrast the three tunics that make up the walls of most blood vessels. Distinguish between elastic arteries, muscular arteries, and arterioles on the basis of structure, location, and function.
24 Νοε 2022 · The elastic tissue helps to maintain blood pressure in the arteries. It stretches and recoils to even out any fluctuations in pressure. The outer wall, sometimes referred to as the tunica adventitia, or tunica externa. Contains the structural protein collagen.
The coronary arteries can become narrowed or blocked by fatty deposits. Suggest how the narrowing of the coronary artery may affect how the heart functions and how this may affect other body cells.
31 Ιαν 2024 · Worked example: Blood vessel features. The correct answer is B. This is because elastic arteries do not contain many smooth muscle fibres and are not able to perform vasoconstriction or vasodilation. In contrast, muscular arteries contain much more smooth muscle.
Elastic arteries include the largest arteries in the body, those closest to the heart, and give rise to the smaller muscular arteries. The pulmonary arteries, the aorta, and its branches together comprise the body’s system of elastic arteries.
The elastic properties of the arteries are essential for blood flow. The pressure in the arteries increases and arterial walls stretch when the blood is pumped out of the heart. When the aortic valve shuts, the pressure in the arteries drops and the arterial walls relax to maintain the blood flow.
