Muscle 1-3

Question 1

Skeletal muscle

Answer 1

Multi nucleate

Formed in utero - undergo hypertrophy

Question 2

Striations

Answer 2

Contain sacromeres - thin actin and thick myosin

Question 3

Titin

Answer 3

Guiding proteins to prevent them going away from eachother

Question 4

Tropmyosin

Answer 4

Covers myosin binding site on actin and covered by troponin which binds calcium from SR

Question 5

Motor unit

Answer 5

Motor neuron and muscle fibre

Question 6

Tension

Answer 6

Force exerted by muscle

Question 7

Load

Answer 7

Force exerted on muscle

Question 8

Isometric

Answer 8

Contraction with constant length

Question 9

Isotonic

Answer 9

Contraction with shortening length

Question 10

Lengthening

Answer 10

Contraction with increasing length

Question 11

Latent period

Answer 11

Time before excitation contraction starts

Question 12

Contraction time

Answer 12

Start of tension with peak tension

Question 13

Tetanus

Answer 13

Muscle spasms

Sustained level of tension

Question 14

Summation

Answer 14

AP’s add up

Question 15

Twitch tension

Answer 15

Never low enough calcium to allow troponin/tropomyosin to reblock myosin binding sites

Question 16

Calcium ATPase

Answer 16

pumps calcium back into SR

Question 17

Oxidative fibres

Answer 17

High mitochondria and vascularisation
Myoglobin
Slow - resist fatigue fast - int resistance

Question 18

Glycolytic fibres

Answer 18

Glycogen fast - backup and fatigue quickly

Question 19

Hypertrophy

Answer 19

Increased muscle mass

Question 20

Smooth muscle

Answer 20

Calcium binds calmodulin

MLCK to MLCP