Question

question 6 (mandatory) (0.75 points) during which step of a muscle contraction cycle is atp needed? when myosin head does a power stroke and pumping of calcium ions back into sr when myosin head detaches from actin and pumping of calcium ions back into sr sarcoplasm when myosin head detaches from actin and release of calcium ions into sarcoplasm when myosin head does a power stroke and release of calcium ions into page 6 of 11

Explanation:

During muscle contraction, ATP is needed when myosin head detaches from actin and calcium ions are pumped back into the sarcoplasmic reticulum (SR). This step requires energy to reset the myosin - actin interaction and restore the resting state of muscle fibers by sequestering calcium.

Answer:

When myosin head detaches from actin and pumping of calcium ions back into SR