Force of contraction

Question 1

what does graded musclle contracction mean

Answer 1

efers to the ability of muscles to vary the force of their contractions to meet different demands

Question 2

what are the 2 types of grading

Answer 2

increase in frequency (temporal summation)
increase in strength (recruitement)

Question 3

what is temporal summation

Answer 3

repeated or rapid stimuli, arriving at a synapse or neuromuscular junction in close succession, lead to cumulative effects

in muscles, it contributes to the increased force and frequency of contractions.

Question 4

how many phases of temporal summation are there?

Answer 4

4 phaes

Question 5

what happens in tetanus

Answer 5

repolorisation does not occur
sustained muscle contraction

Question 6

what happens in unfused (incomplete tenatus)

Answer 6

ca2+ satuation not constant

Question 7

what happens in fused (complete tetanus )

Answer 7

continual ca2+ saturation

Question 8

what are some muscle fibre properties

Answer 8

Length at onset of contraction:
Optimum length
Optimal overlap of thick and thin filaments
Greatest force generation

Question 9

what is the dimater of a muscle fibre

Answer 9

Vary between 10-100 m

Question 10

what happens when a muscle fatigues?

Answer 10

phsiological inability to contract muscles

complex chemical changes within the muscle

Ionic imbalances
Decreased glycogen
Increased lactic acid
Neuromuscular depletion

Question 11

what are the 3 levels frequency of muscle fatigue

Answer 11

low
intermidate
high

Question 12

low muscle fatigue

Answer 12

-little fatigue and constant tension

Question 13

intermediate muscle fatigue

Answer 13

-eventual fatigue and gradual decline

Question 14

high muscle fatigue

Answer 14

maximum tetanic tension
rapid fatigue

Question 15

what are the 2 types skeletal muscle fibre type

Answer 15

fast fibres
slow fibres

Question 16

what are the slow muscle fibres like>

Answer 16

Half diameter
3x longer to reach peak tension
Extensive capillary network (myoglobin)

Question 17

what are the fast muscle fibres like?

Answer 17

Rapid contraction speed
High force generation
Fatigue more quickly than slow-twitch fibers
Primarily rely on anaerobic metabolism for energy

Question 19

what can graded contraction be affected by

Answer 19

Graded contraction can be affected at a muscle fibre level by temporal summation, fibre diameter, muscle fibre length and fatigue.

Question 20

why do muscles use grade contraction

Answer 20

Muscles used graded contractions to generate smooth movement and control force of movement.