Question

A muscle moving a load goes through two phases of contraction. Which phase occurs first, and what happens inside the muscle during this phase

Answer 1

The phase that occurs first when a muscle carries load is called the contraction phase.

Phases of muscle contraction

When lifting up a load, the muscle passes through some phases of contraction such as:

• contraction phase and

• relaxation phase

The series of events that occurs in the contraction phase include the following:

• Depolarisation and calcium ion release.

• Actin and myosin cross-bridge formation.

• Sliding mechanism of actin and myosin filaments.

• Sarcomere shortening (muscle contraction)

Therefore the phase that occurs first when a muscle carries load is called the contraction phase.

Learn more about muscle contraction here:

https://brainly.com/question/25778330