The Human Muscular System How You Move

What unique feature allows cardiac muscle cells to contract in perfect, synchronized harmony?

Which of the following describes the microscopic functional unit of a skeletal muscle fiber?

How many times does the human cardiac muscle contract on average in a single day?

Approximately what percentage of an average human's body weight is made up of skeletal muscle?

Which of the three muscle types in the human body is under conscious, voluntary control?

In which of the following body parts would you find involuntary smooth muscle?

What ion must be released inside a muscle cell to trigger the sliding of contraction proteins?

Which two proteins slide past each other to cause a muscle contraction at the microscopic level?

Which muscle type is coolest?