The human muscular system
Chapter 1
The body's three engines
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Chapter 2
Levers, lines, and brain signals
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Chapter 3
Fueling the fire
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Chapter 4
Weird, wild, and ancient muscles
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YOUR GOAL
Master of The human muscular system
Ch 1 · The body's three engines
Fun Fact
Heart endurance: The human heart pumps enough blood over an average lifetime to fill three massive supertanker ships.
Glossary
adenosine triphosphate (noun)
An organic compound that provides energy to drive many processes in living cells. Skeletal muscles store only enough of this molecule for about three seconds of maximum physical effort.
An organic compound that provides energy to drive many processes in living cells. Skeletal muscles store only enough of this molecule for about three seconds of maximum physical effort.
Quiz
What unique feature allows cardiac muscle cells to contract in perfect, synchronized harmony?
Quiz
Which of the following describes the microscopic functional unit of a skeletal muscle fiber?
Quiz
Approximately what percentage of an average human's body weight is made up of skeletal muscle?
Quiz
Which of the three muscle types in the human body is under conscious, voluntary control?
Quiz
What ion must be released inside a muscle cell to trigger the sliding of contraction proteins?