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Muscle relaxation involves release/trapp...

Muscle relaxation involves release/trapping of calcium ion by sarcoplasmic reticulum.

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### Step-by-Step Solution: 1. **Understanding Muscle Contraction**: - Muscle contraction occurs when a muscle fiber receives a stimulus, which triggers the release of calcium ions from the sarcoplasmic reticulum (SR). 2. **Role of Calcium Ions**: - Calcium ions play a crucial role in muscle contraction. They bind to troponin, a protein associated with actin filaments, which causes a conformational change that allows myosin heads to attach to actin, leading to muscle contraction. ...
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What is sarcoplasmic reticulum?

Assertion: on stimulation, a muscle cell releases calcium ions (Ca^(2+)) from sarcoplasmic reticulum. Reason: By reacting with a protien complex, Ca^(2+) uncover active sites on the actin filaments.

What is the significance of Sarcoplasmic reticulum?

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Arrange the following events of muscle contraction in the sequence : (i) Generate an action potential in the sarcolemma (ii) Form a cross bridge (iii) Release a neurotransmitter (Acetylcholine) (iv) Release of calcium ions in sarcoplasm (v) Pulls the attached actin filaments towards the centre of "A" band (vi) Remove the masking of active sites for myosin The correct option is :-

Assertion. On receiving action potential via T-tubules, the sarcoplasmic reticulum releases Ca^(++) into the sarcoplasm. Reason. Ca^(++) uncover the active site of actin myofilament, allowing a meromyosin head to join this site.