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Stack #4475155

QuestionAnswer
What are three types of muscles tissue in the body? Skeletal, Cardiac, and Smooth muscle tissue
What is the function of the sarcomere in muscle contraction? The sarcomere is the basic contractile unit of muscle. It shortens as actin and myosin slide each other during contraction
What is the role of the T tubules in a muscle cell? T tubules carry the action potential deep into the muscle fiber to trigger calcium release from the sarcoplasmic reticulum.
What is the difference isometric and isotonic muscle contractions? Isometric contractions produce tensions without changing muscle length. Isotonic contractions involve a change in muscle length.
What structure stores calcium in muscle fiber? The sarcoplasmic reticulum stores calcium needed for muscle contraction.
What is acetylcholine and what role does it play at the neuromuscular junction? Acetylcholine is a neurotransmitter that initiates muscle contraction triggering an impulse in the muscle fiber
What is excitation- contraction coupling? The nerve impulse leads to muscle contraction through calcium release and actin myosin interaction
What role do calcium ions play in muscle contraction? Calcium attaches to troponin, shifting tropomyosin to expose binding site myosin head to attach
How does the muscle fiber relax after contraction? Calcium is pumped the sarcoplasmic reticulum, it blocks actin myosin interaction, and then the muscle relaxes
What causes the myosin head to release from actin during the contraction cycle? ATP binds to the head of myosin causing it to detach from actin and reset
Created by: zlatham
 

 



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