Lecture 11

Question 1

Motor Neuron Branches:

Answer 1

To multiple muscle fibers forming a motor unit

Question 2

Each Muscle Fiber

Answer 2

Is innervated by only one motor neuron

Question 3

How do Neurons Increase Muscle Tension (3):

Answer 3

1. Increasing AP frequency (temporal summation)
2. Recruiting more motor units
3. Recruiting fibers that have a higher intensity of contraction

Question 4

What is the relationship between
contraction force & shortening velocity?

Answer 4

Lower force leads to increased velocity

Question 5

How can a sarcomere generate different
amounts of force?

Answer 5

Increases cross-bridges leads to increased force

Question 6

Why is there an inverse relationship between
force generation and contraction velocity (2)?

Answer 6

1. Cross-bridge cycle takes time
2. Increased cross-bridges leads to increased time to move the same distance

Question 7

How much tension a muscle can produce during contraction is
related to its:

Answer 7

Resting length

Question 8

There is an optimal overlap of thick and thin filaments that
produces:

Answer 8

The maximum amount of tension during muscle
contraction

Question 9

The length-tension relationship for a sarcomere is strong
evidence supporting:

Answer 9

The sliding-filament theory