Motor Control I

Question 1

Extracellular Membrane +/-?

Answer 1

Positive

Question 2

Intracellular Membrane +/-?

Answer 2

Negative

Question 3

WHy does AP propagation only occur in one direction

Answer 3

Absolute refractory period

Question 4

Three Types of Muscle Movement

Answer 4

Voluntary
Reflex (eg stretch reflex)
Rhythmic Motor Pattern (eg breathing)

Question 5

Thalamus Role Motor Sysstem

Answer 5

Relay

Question 6

Basal Ganglia Role Motor System

Answer 6

Approving and Reject Signals

Question 7

Cerebellum Role Motor System

Answer 7

Correcting Errors

Question 8

What do gamma motor neurons do

Answer 8

Synapse on intrafusal muscle fibres within muscle spindles

Question 9

Are alpha and gamma moto Neurons in the same motor nucleus

Answer 9

Yes (obv only if they’re supplying the same muscle)

Question 10

Alpha motoneuron neurotransmitter

Answer 10

ACh

Question 11

Lower motor neurons cell body location

Answer 11

Ventral Horn

Question 12

Motor neurons that do fine motor control innervate ______ muscle fibres

Answer 12

Few (10-100)

Question 13

Small motor neurons innervate Type _ muscle fibres

Answer 13

Type I (slow oxidative)

Question 14

Large motor neurons innervate Type _ muscle fibres

Answer 14

Type IIB

Question 15

What determines whether a muscle fibre is Type I or Type II

Answer 15

Myosin heavy chain (head) protein (MyHC I vs MyHC II)

Question 16

Preload Definition

Answer 16

Load experienced by muscle when relaxed, determines resting length

Question 17

Afterload Definition

Answer 17

Load a muscle works against during contraction