Summary
Actin and myosin filaments slide past each other using ATP and calcium, according to the sliding filament theory.
In depth
Action potential triggers Ca2+ release; Ca2+ binds troponin, moving tropomyosin to expose myosin-binding sites; myosin heads bind actin and power stroke with ATP; sarcomeres shorten as filaments slide. Rigor mortis results from lack of ATP.
The sarcomere is the contractile unit with Z lines, thin and thick filaments. Motor neurons release acetylcholine at the junction. Tetanus describes sustained contraction.
Key idea: filaments slide; they do not shorten.
Frequently asked questions
What is Muscle Contraction?
Actin and myosin filaments slide past each other using ATP and calcium, according to the sliding filament theory.
Which area of biology covers Muscle Contraction, and how advanced is it?
Muscle Contraction is one of the 51 topics in Human Physiology. It is rated Intermediate, so it suits learners who already know the core vocabulary. Related topics in this area include Muscular System, Frank-Starling Law, Blood Glucose Regulation.
Can you give an example of Muscle Contraction?
Creatine phosphate regenerates ATP quickly.
What should I learn before Muscle Contraction?
Work through the Beginner topics in Human Physiology first, such as Homeostasis, Tissues and Organs, Skeletal System, then return to Muscle Contraction. Intermediate topics assume the Beginner vocabulary.
What topics are related to Muscle Contraction?
The closest topics to Muscle Contraction are Muscular System, Frank-Starling Law, Blood Glucose Regulation, Lymphatic System. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Muscle Contraction?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Muscle Contraction. To practise the whole of Human Physiology, use the Human Physiology quiz.
How is Muscle Contraction different from Muscular System?
Muscle Contraction: Actin and myosin filaments slide past each other using ATP and calcium, according to the sliding filament theory. Muscular System: Skeletal, smooth and cardiac muscle produce movement and move substances inside the body. Read both side by side and note what each one explains.
How should I study Muscle Contraction step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Muscular System and explain the difference aloud. Finally, take the Human Physiology quiz and come back to this page for any question you miss.