The picture shows a group of muscle cells in the heart. all of these muscle cells beat in unison to push blood in timing with the rhythm of the heart, at the direction of nearby nerve cells. these muscle cells could best be called a

tissue. I think. I'm not so sure but that's my best guess.

The correct answer will be- tissue

Explanation:

A tissue is a group of specialized cells programmed to perform similar functions by specific arrangement.

In the given question, since all the muscle cells beat together to pump the blood in response to the nerve cells therefore these cells perform the same functions and thus forms the tissue system of the body. Also, these tissues together form the organ known as the heart specialized to pump the blood.

Thus, the tissue is the correct answer.

the form of energy changes and the total energy increases0l