'1 of the 3 types of muscle, it has a built-in contraction rate of 60-70 times a minute'
cardiac muscle
THE BODY HUMAN: 1 of the 3 types of muscle, it has a built-in contraction rate of 60-70 times a minute
1 of the 3 types of muscle, it has a built-in contraction rate of 60-70 times a minute
1 of the 3 types of muscle, it has a built-in contraction rate of 60-70 times a minute
THE BODY HUMAN
cardiac muscle
THE BODY HUMAN