muscular system acute responses

Question 1

the muscular system

Answer 1

includes muscle fibres, fuels and motor units, which cause the contractions that produce movement
EVERYTHING INCREASES

Question 2

the all or nothing principle

Answer 2

all the muscle fibres within the unit will contract at the same time at the same maximum possible extent

Question 3

the size principle

Answer 3

motor units will be recruited in order of size from smallest to largest, depending upon the intensity

Question 4

motor unit recruitment

Answer 4

muscle fibres are recruited by the motor neuron in response to messages from the CNS.
the CNS uses motor neuroms to send the muscles messages (contract, relax)
allows for greater force production (the movement will hve greater power

Question 5

link to decreased fuel stores

Answer 5

fuels are broken down to resynthesize ATP
muscular fuel stores deplete depending on the duration of exercise
increased ATP production

Question 6

enzyme activity

Answer 6

enxymes allow chemical reactions involved in the production of energy and the removal of waste to occur at a faster rate.
as muscles produce more heated enzyme activity increases to produce energy via the three energy systems

Question 7

blood flow to working muscles

Answer 7

redistriubution of blood flow during exercise, vasoconstriction at non-vital organs and vasodilation at the working muscles
more oxygen is being delivered to the working muscles

Question 8

muscle temperature

Answer 8

increased blood flow to the muscles coupled with the heat generated with the production of ATP results in increases muscle temperature
increased production of ATP

Question 9

av-o2 differnece

Answer 9

a muscular and a cardiovascular response
the amount of o2 in the arteries compared to o2 in the veins
has no real impact just shows the amount of oxygen that is being used by the muscles