Question

Place the following events in muscle contraction in the correct sequence from first to last. 1. ATP binds to myosin head. 2. Myosin head interacts with actin. 3. ATP is converted to ADP and Pi. 4. Myosin head is cocked back. 5. Myosin head pivots in the power stroke. 6. ADP and Pi are released from myosin.

Answer 1

Correct sequence in muscle contraction is:

1. Myosin head is cocked back.
2. Myosin head interacts with actin.
3. ATP is converted to ADP and Pi.
4. Myosin head pivots in the power stroke.
5. ADP and Pi are released from myosin.
6. ATP binds to myosin head.

Step-by-step explanation:

Understanding the sequence of events during muscle contraction is essential in biology, particularly when studying the mechanism of muscle movement. The correct order from first to last is as follows:

1. Myosin head is cocked back.
2. Myosin head interacts with actin forming a cross-bridge.
3. ATP is converted to ADP and Pi, providing energy for the myosin head while it’s cocked.
4. Power stroke occurs as the myosin head pivots and bends, pulling the actin filament.
5. ADP and Pi are released from myosin as a result of the power stroke.
6. ATP binds to myosin head, causing it to detach from actin and allow the cycle to repeat.

During this process, the sarcomere shortens, and the muscle contracts, with each step being critical for the generation of force.

Answer 2

The correct sequence of muscle contraction from first to last is given below

Step-by-step explanation:

step 1 myosin head interacts with actin

step 2 ATP binds to myosin head

step 3 ATP is converted to ADP and Pi

step 4 ADP and pi are released from myosin

step 5 Myosin head pivots in the power stroke

step 6 Myosin head is cocked back.