Question

What might happen to the human heart during a trip to Mars?

A. stop working completely
B. become too weak to pump blood
C. expand and become too large to work properly

Answer 1

B. becomes too weak to pump blood

Explanation: I just took the test.

Answer 2

Because the atmosphere is thinner, there would be less pressure keeping the heart at its current size and it would expand and become too large to work properly