Mitroscopic Muscle Anatomy

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by juliaperrrrry
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Human Anatomy

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Mitroscopic Muscle Anatomy

The Sliding Filament Theory- Calcium is released from the sarcoplasmic reticulum - calcium binds to troponin which changes the shape of the troponin and tropomyosin. This moves the tromopyosin away from the binding sites- This allows ATP hydrolized myosin heads to bind to actin- The ATP breaks down to ADP and inorganic phosphate which causes the power stroke- ATP binds to the myosin head which causes it to be released- ATP is hydrolized which re-energizes the myosin head- Calcium is then pumped back into the sarcoplasmic reticulum and troponin and tropomyosin cover the actin again

Microscopic Muscle Anatomy

Julia Perry

Steps at the Neuromuscular Junction

1.) Action potential reaches the axon terminal of the motor neuron 2.)Calcium channels open and calcium ions enter the axon terminal3.)Calcium entry causes synaptic vesicles to release acetylcholine, a neurotransmitter, by exocytosis4.)Acetylcholine attaches to receptors on sarcolemma of muscle cell 5.)In response to the binding of acetylcholine to receptors, the sarcolemma can now recieve sodium ions6.)Sodium rushes into the cell creating an action potential as potassium leaves the cell7.) This results in depolarization and once the threshold is reached, muscle contraction cannot be stopped

Works cited:"Animation: Function of the Neuromuscular Junction (Quiz 1)." Animation: Function of the Neuromuscular Junction (Quiz 1). 1 Jan. 2006. Web. 13 Mar. 2015Burkett, Ray D. "Muscle Physiology." Principles of Anatomy and Physiology. Southwest Tennessee Community College, 8 Sept. 2006. Web. 13 Mar. 2015Marieb, Elaine Nicpon. Essentials of Human Anatomy ' Physiology. 10th ed. Boston: Benjamin Cummings, 2012. Print..


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