Question

1. the ability to return to starting length is known as
2. the ability to shorten or contract is called

muscle structure

1. inside each muscle fiber are multiple
2. each myofibril is made up of repeating sections called
3. the sarcomere contains two main filaments:

a) actin (the filament)
b) myosin (the filament)

Explanation:

• For question 7: Elasticity is the property of a muscle to return to its original length after being stretched.
• For question 8: Contractility is the ability of muscle tissue to shorten when stimulated.
• For question 9: Myofibrils are the rod - like structures within muscle fibers that are responsible for muscle contraction.
• For question 10: Sarcomeres are the basic functional units of myofibrils and are the repeating sections.
• For question 11a: Actin is the thin filament in the sarcomere.
• For question 11b: Myosin is the thick filament in the sarcomere.

Answer:

1. Elasticity
2. Contractility
3. Myofibrils
4. Sarcomeres

11a. thin
11b. thick