Quiz 2

Question 1

The motor command is initiated in the

Answer 1

motor cortex

Question 2

The force generated by a skeletal muscle is

Answer 2

proportional to the level of motor command directed to that muscle

Question 3

The level of motor command to a skeletal muscle is best represented by the

Answer 3

number of activated corticospinal neurons projecting to that muscle

Question 4

The spinal tracts which contain the most neurons which initiate contraction of limb muscles are the

Answer 4

corticospinal tracts

Question 5

Most corticospinal neurons decussate at the

Answer 5

base of the medulla

Question 6

In terms of the motor pathway supraspinal input refers to

Answer 6

impulses which travel along descending corticospinal neurons

Question 6

A major task of the supplementary motor area of the brain is to

Answer 6

store a program of movement

Question 7

Exercise involving only the right arm will require

Answer 7

increased activation of left-sided corticospinal neurons

Question 8

Exercise involving only the left leg will require

Answer 8

increased action for the right motor cortex

Question 9

To change the level of muscle force an altered motor command must be transmitted via

Answer 9

alpha motor neurons