Skeletal Muscle 2

Question 1

Classification based on duration of muscle twitvh

Answer 1

White (fast) muscle fibres
Extraocular muscles and hands for fine movement. 0.025 seconds contraction time

Slow(red) muscles
Back muscles(longer contraction time) 0.1s

Question 2

Factors affecting contractile response

Answer 2

Strength of stimulus
Frequency of stimulus
Load on the muscle
Initial muscle length
Temperature

Question 3

Isotonic contraction?

Answer 3

When there is a constant force associated with shorterning(change in length of the muscle)

Question 4

Isometric contraction

Answer 4

Constant length but change in tension of the muscle

Question 5

If a muscle cannot work against a load then it can only generate

Answer 5

Isometric contraction

Question 6

What are the 3 components of skeletal muscle

Answer 6

Contractile component
series elastic component
Parallel Elastic component

Question 7

The contractile component?

Answer 7

Represents the thick and thin filaments in myofibrils. Viscous, resistant to stretch and unable to return to original length after shortening. Comprises 60 percent of total muscle proteins

Question 8

SEC

Answer 8

Refers to the elastic tissue of the muscle which us present in series with the cc of the muscle. Consists of the elastic tendon of the muscle

Question 9

PEC

Answer 9

elastic tissue of the muscle which is attached parallel to the CC. Structural elastic tissues of the muscle such as connective sheaths, sarcolemma and filaments. Explains why the muscle regains its original length after it is passively stretched

Question 10

Optimum length of a muscle?

Answer 10

The length at which it will develop maximum active tension

Question 11

Series and parallel arrangement o sarcomeres optimal for?

Answer 11

Velocity oof shortening and range of motion

Force production