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anzhelika [568]
3 years ago
14

Why do arteries need to be thick, muscular, and elastic?

Biology
2 answers:
UkoKoshka [18]3 years ago
8 0

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.

Rasek [7]3 years ago
8 0
Arteries have much thicker walls than other blood vessels in order to withstand the higher blood pressure that propels oxygenated blood away from the heart. 
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Answer:

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Explanation:

The attached figure shows the diagram of the given question.

We need to find how many angles are alternate exterior angles with angle 5?

Exterior angle = Angle that is made outside of the shape

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From the figure, 8, 7, 9, 10, 12, and 11 are the angles that are on the same transversal. 8, 7, 9, 10, and 12 are just exterior. It means that 11 is the alternate exterior of angle 5. So, only one angle is alternate exterior angles with angle 5.

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