Answer:

C. they carry blood to all parts of the body

Explanation:

The blood vessels carry blood accompanied by oxygen, nutrients, water, and hormones throughout the body because they have a flexible tube.

The blood vessel comprises arteries, arterioles, capillaries, venules, and veins.

Arteries and arterioles

Arteries are well built, they are flexible which carries blood away from the heart. It also carries high blood pressure. As the arteries are flexible, they become confined when the heart is relaxing. In this way, arteries maintain the blood pressure of the body.

The arteries split into many smaller vessels and in the end, become very small vessels called Arterioles. They both have a muscular wall; accordingly, they maintain their size(diameter) to increase or decrease the flow of blood to a particular body part.

Capillaries

Capillaries are very thin and small vessels act as a connection between arteries(carry blood away from the heart) and veins (carry blood again back to the heart). The capillaries allow Oxygen and nutrients to pass from the blood into the tissues and carry waste products from tissues to the blood.

c. they carry blood to all parts of the body

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