Muscular System

Question 1

what are the three types of muscle fibres

Answer 1

• type 1 (slow oxidative)
• type 2a (fast oxidative glycolic)
• type 2b (fast glycolic)

Question 2

functional characteristics of type 1

Answer 2

uses oxygen
low fatiguability

Question 3

functional characteristics of type 2a

Answer 3

fast contraction speed
high force produced

Question 4

functional characteristics of type 2b

Answer 4

don’t use oxygen
use glucose

Question 5

structural characteristics of type 1

Answer 5

high capillary count
high myoglobin count

Question 6

structural characteristics of type 2a

Answer 6

large neurone size
medium capillary count

Question 7

structural characteristics of type 2b

Answer 7

large motor neurone size
high volume of photo creatine

Question 8

whats wave summation

Answer 8

occurs when stimulations are delivered to a muscle fiber faster than it is able to completely relax.

Question 9

whats motor unit

Answer 9

a motor neurone and its muscle fibres

Question 10

what are motor neurones

Answer 10

nerve cells which transmit the brain’s instructions as electrical impulses to the muscles

Question 11

whats the all or none law

Answer 11

where a sequence of impulses has to be sufficient intensity to stimulate all of the muscle fibres in a motor unit to order for them to contract. if not, none of them contract.

Question 12

whats spatial summation

Answer 12

when the strength of a contraction changes by altering the number and size of the muscle motor units.