Blood vessel walls contain elastin, a protein that allows the vessel to stretch under high pressure. Which type of blood vessel do you expect will have the highest concentration of elastin in its walls?

Awnser:

Arteries

Explanation:

Arteries have a higher amount of elastin than veins. Thus, veins have a higher ratio of collagen to elastin thsn do arteries

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

why do you want to cheat? i dont take it, so i dont know.

explanation:

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