The diagram shows a cross section of an artery and vein....

The diagram shows a cross section of an artery and vein. What is the function of the tunica externa and why is it thicker in the artery than in the vein? a. The tunica externa prevents blood cell adhesion to the wall of the vessel. It is thicker in the artery to protect against the higher blood pressure found in arteries. b. The tunica externa protects the vessel from wear and tear and also provides support for the vessel. It is thicker in the artery to protect against the higher blood pressure found in arteries. c. The tunica externa protects the vessel from wear and tear and provides support for the vessel. It is thicker in the artery to protect against the lower blood pressure found in arteries. d. The tunica externa prevents blood cell adhesion to the wall of the vessel. It is thicker in the artery to protect against the lower blood pressure found in arteries.

The diagram shows a cross section of an artery and vein. What is the function of the tunica externa and why is it thicker in the artery than in the vein?
a. The tunica externa prevents blood cell adhesion to the wall of the vessel. It is thicker in the artery to protect against the higher blood pressure found in arteries.
b. The tunica externa protects the vessel from wear and tear and also provides support for the vessel. It is thicker in the artery to protect against the higher blood pressure found in arteries.
c. The tunica externa protects the vessel from wear and tear and provides support for the vessel. It is thicker in the artery to protect against the lower blood pressure found in arteries.
d. The tunica externa prevents blood cell adhesion to the wall of the vessel. It is thicker in the artery
to protect against the lower blood pressure found in arteries.

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Key Concepts

Arterial vs. Venous Adaptations

Arteries are subjected to higher blood pressure compared to veins. This difference results in arteries having thicker and more reinforced outer layers (tunica externa) to cope with the increased force, whereas veins, which carry blood under lower pressure, have a thinner tunica externa.

Blood Pressure

Blood pressure is the force exerted by blood on the walls of blood vessels. Higher blood pressure in arteries necessitates structural adaptations, such as a thicker tunica externa, to sustain the pressure and prevent damage.

Blood Vessel Structure

Blood vessels are comprised of multiple layers (tunica intima, tunica media, and tunica externa), each with specialized roles. Understanding these layers is essential in comprehending how vessels maintain their shape and function under varying physiological conditions.

Tunica Externa

The tunica externa is the outermost layer of a blood vessel, composed primarily of connective tissue. It provides structural support, protection against external forces, and helps maintain the integrity of the vessel.

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