What causes calcium to be released from the sarcoplasmic reticulum
Asked by admin @ in Biology viewed by 205 People
What causes the release of calcium from the terminal cisternae of the sarcoplasmic reticulum within a muscle cell?
Asked by admin @ in Biology viewed by 205 People
What causes the release of calcium from the terminal cisternae of the sarcoplasmic reticulum within a muscle cell?
Answered by admin @
Answer: Muscle contractions stimulate the release of calcium
from sarcoplasmic reticulum.
Explanation:
During muscle contractions, calcium is released from its store into the sarcoplasma, where it goes and bind to troponin protein complex . This causes the troponin to change its shape and remove the tropomyosin from the myosin-binding site for exposure. Myosin then binds to actin active site and form a cross-bridge or power stroke due the presence of ATP.
Calcium functions in regulating muscle contractions and relaxations in response to stimulus.
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