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 2 · Levers, lines, and brain signals
teacher Muscles only pull, they never push away, Working in pairs to get us through the day.
Fun Fact
Achilles tendon power: The Achilles tendon can withstand loads up to twelve times a person's body weight during running.
Glossary
motor unit (noun)
A functional unit consisting of a motor neuron and all the muscle fibers it innervates. Sir Charles Sherrington first introduced this concept of neuromuscular control in 1925.
A functional unit consisting of a motor neuron and all the muscle fibers it innervates. Sir Charles Sherrington first introduced this concept of neuromuscular control in 1925.
Quiz
What type of physical lever system is most common in the human body, where the muscle force is applied between the joint and the load?
Quiz
Because muscles can only pull and never push, how do they typically work to move limbs?
Quiz
Which chemical neurotransmitter is released by motor neurons to signal a muscle to contract?
Quiz
Which muscle acts as the opposing partner (antagonist) when the biceps muscle contracts to bend the elbow?
Quiz
What tough, fibrous connective tissue attaches skeletal muscles directly to bones?
Quiz
Which tendon in the human body is the thickest and strongest, capable of supporting immense loads?