Objective 11

Question 0

Does generation of force achieved by activation of the actin-myosin cross-bridges affect the muscle fiber?

Answer 0

No. Generation of force does not necessarily cause shortening of the fiber

Question 1

Explain the Principles of Muscle Mechanics as they apply to both the single fiber and the whole muscle

Answer 1

Contraction (cross-bridge formation) produces tension, the force exerted on the load or object to be moved.

Question 2

When does shortening of the fiber occur?

Answer 2

Only when the tension generated by the cross-bridge exceeds oppositional forces (or loads)

Question 3

What are the two types of muscle contractions?

Answer 3

Isometric
&
Isotonic

Question 4

What is isometric contraction?

Answer 4

no shortening; muscle tension increases but does not exceed the load

Question 5

What is isotonic contraction?

Answer 5

muscle shortens because muscle tension exceeds the load

Question 6

What are the two types of Isotonic contraction?

Answer 6

Concentric
&
Eccentric

Question 7

What is Concentric muscle contraction?

Answer 7

the muscle shortens and does work

Question 8

What is Eccentric muscle contraction?

Answer 8

The muscle maintains tension as it lengthens