A. Write the letter for the correct answer.
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The muscular system is primarily made up of three types of muscles: skeletal, smooth, and cardiac. Each type plays a unique role in the body, from facilitating movement to controlling involuntary functions. Fun fact: skeletal muscles function under conscious control, enabling you to dance, run, or do flips!

Muscles are indeed made of specialized cells called myocytes, which work together to contract and generate movement. These cells are grouped into bundles, which is what gives muscles their strength and flexibility. Remember, though, it’s not just about size; the coordination and endurance of these cells are equally important!