Which function of the muscular system is best illustrated by the heart pumping blood throughout the body? O hormone regulation
O support and strength
involuntary movement
O voluntary movement

i think it is A hormone regulation

A.

Explanation:

the answer would be knowledge about cars!

a researcher conducts an experiment on the secretion of a particular hormone in mice. scientists inject mice with a substance that stimulates the production of the hormone. the scientists then test the levels of hormones produced by the mice. the tool used to measure the hormones consistently detects the levels at 10 points lower than the actual hormone levels in the mice. this tool makes measurements, but the measurements aren't .

explanation:

no u