Discussion 3

Question 1

______________ is a group of myofibrils innervated by the same motor neurons.

Answer 1

Motor unit

Question 2

Motor units act as one functional unit meaning

Answer 2

will contract simultaneously upon activation

Question 3

A different types of motor unit

Answer 3

type 1 and type 2

Question 4

The motor unit type is determined by motor neuron type

Answer 4

type 1,2, 3

Question 5

if you switch nerve type innervation this influences _____________

Answer 5

muscle type

Question 6

______________ process of adding motor units as you perform a function

Answer 6

recruitment

Question 7

Recruitment increases _______________

Answer 7

force production and velocity

Question 8

Why does recruitment increase force production

Answer 8

more cross bridges

Question 9

What are some ways we can regulate force and velocity of skeletal muscle

Answer 9

1. changes in sarcomere length
2. changes in cross sectional area
3. modify frequency of stimulation. Higher frequency contractions
4. Recruitment
5. Changes in MHC expression

Question 10

Smooth muscle is

Answer 10

• involuntary
• smaller than skeletal muscles
• no Sarcomeres
• No t tubules, no NMJS

Question 11

Lengths of filaments are variable and randomly orientated in

Answer 11

smooth muscle

-They have thin and thick filaments