In general, the vessels that return blood to the heart in a closed circulatory system are referred to as

A. capillaries.
B. arteries.
C. auxiliary hearts.
D. veins.
E. sinuses.


Answer: D

Biology & Microbiology

You might also like to view...

Each structure within an ovary that contains an oocyte is called a ____________

Fill in the blank(s) with the appropriate word(s)

Biology & Microbiology

Why do fungi have the ability to decompose materials such as cotton and wool that other organisms cannot?

What will be an ideal response?

Biology & Microbiology

? In the image above, the substance indicated as C is a(n) _____.

A. inhibitor B. regulatory molecule C. substrate D. coenzyme E. cofactor

Biology & Microbiology

Which of the following is responsible for causing gas gangrene?

A. Clostridium botulinum B. Clostridium tetani C. Clostridium perfringens D. Clostridium acetobutylicum

Biology & Microbiology