During muscle relaxation, how are calcium levels in the sarcoplasm reduced?
Show answer and explanation
Correct answer: Calcium is returned to the sarcoplasmic reticulum by SERCA.
The SERCA (Sarcoplasmic/Endoplasmic Reticulum Calcium ATPase) pump uses ATP to move calcium against its concentration gradient back into the SR. This drop in cytoplasmic calcium causes it to dissociate from troponin.
Keep practicing
More Muscle Contraction questions
- What is the primary neurotransmitter released at the neuromuscular junction?
- Rigor mortis occurs after death because:
- Which protein found in the Z-disc anchors the thin filaments?
- The 'latent period' of a muscle twitch represents the time required for:
- In cardiac muscle, the structure that allows for rapid electrical coupling between cells is the:
- Smooth muscle contraction is 'tonic' and efficient because of the 'latch state.' This state is characterized by: