Skeletal Muscle Phys (length-tensin Relationship)

Question 1

What happens to the muscle during an isometric contraction?

Answer 1

-the muscle stays at a fixed length

Question 2

How is a passive force generated?

Answer 2

• by stretching the muscle and results from the elastic recoiled of the tissue itself
  
  • largely caused by the protein Titin, which acts as a molecular bungee cord

Question 3

How is active force generated?

Answer 3

-when myosin thick filaments bind to actin thin filaments, engaging the cross bridge cycle and ATP hydrolysis

Question 4

Define total force

Answer 4

-sum of passive and active forces

Question 5

Passive force in skeletal muscle is largely cause by what protein?

Answer 5

-titin protein

Question 6

When a skeletal muscle is stimulated and generates force but remains at a fixed length…

Answer 6

-the muscle is contracting isometrically

Question 7

In skeletal muscle, active force stimulated through a range of muscle length….

Answer 7

Will utilze ATP hydrolysis to drive the cross bridge cycle

Question 8

When will maximal active tension be produced in a skeletal muscle fiber?

Answer 8

-when the fiber is at its resting length

Question 9

What is the key variable in an isometric contraction of a skeletal muscle?

Answer 9

-length-tension relationship