Contracts about 70 times per minute

a. cardiac
b. skeletal
c. smooth
d. none of the above

The CARDIAC muscle contracts about 70 times per minute. The reason is, is because it is a muscle that is located in the heart. It contracts involuntarily. So with that being said, the correct answer is A. Cardiac.

I hope this is the answer you were looking for and that it helps!! :)

Dis the answer hope this

(a) is not correct because one does not get increased cholesterol  from lifting weights.(b) is not correct because lifting weights cannot reduce the risk of a hereditary disease.(c) is not correct because back pain isn't a benefit! and plus, if he lifts weights properly, he should not have back pain.(d) is the correct answer because his ligaments will gain mass, making it easier for him to carry heavier weights and he will also be stronger!