Which muscles never tire?

Question

Choices are: skeletal or cardiac.

Answer 1

If your cardiac (heart) muscle tires, you'll die. Skeletal muscles are all of your other muscles, like the ones in your arms and legs. Run a few miles or lift some weights and you'll feel those ones tire.

Answer 2

cardiac- your heart never gets tired until you get old

Answer 3

Muscles produce motion.

Eventually any muscle will tire if used enough.

Will