Question

Answer the following questions.1. List and describe the anatomical components that make up a muscle fiber. 2. List the components of a motor unit. 3. What are the steps in excitation–contraction coupling? 4. What is the role of calcium in muscle contraction? 5. Describe the sliding filament theory. How do muscle fibers shorten? 6. What are the basic characteristics that differ between type I and type II muscle fibers? 7. What is the role of genetics in determining the proportions of muscle fiber types and the potential for success in selected activities? 8. Describe the relation between muscle force development and the recruitment of type I and type II motor units. 9. Explain, and give examples of, how concentric, static, and eccentric contractions differ. 10. What two mechanisms are used by the body to increase force production in a single muscle? 11. What is the optimal length of a muscle for maximal force development? 12. What is the relation between maximal force development and the speed of shortening (concentric) and lengthening (eccentric) contractions? 13. In muscle contraction, what roles are played by the protein titin? 14. Why do previously trained muscles adapt more quickly to retraining after a period of disuse?

Answer 1

Answer:

Answers are explained below...

Explanation:

1. A muscle fiber is composed up of myofibrils that contain an arrangement of sarcomeres (A sarcomere is the basic contractile unit of a myofibril...)

Moreover a sarcomere also contains actin and myosin filaments for relaxation and contraction of a muscle as a whole.

2. The motor unit of a muscle is composed up of a neuron called as motor neuron (you can guess by it's name that it serves some motor function). The axonal endings of a motor neuron are embeded in a muscular fiber. A series of nerve impulses control the action of muscle.

Sorry because of time limit...

Answer 2

The Calcium bind with actin and troponin is removed that was blocking. Now myosin can attach and start contracting.

What made the Muscular system?

The muscular system of a body is made up of muscles and muscles are made up of millions of muscle fibers.

A muscle fiber is made up of small units called sarcomere, which contains actin and myosin fibers.

A muscle contracts when action potential spread in the sarcomere space the calcium is released due to action potential.

Calcium bind with actin and troponin is removed that was blocking. Now myosin can attach and start contracting.

Therefore, the Calcium bind with actin and troponin is removed that was blocking. Now myosin can attach and start contracting.

Learn more about the Muscular system:

https://brainly.com/question/25289187