muscle contraction

Question 1

three types of muscle

Answer 1

smooth
cardiac
skeletal

Question 2

smooth muscle

Answer 2

contracts without conscious control

Question 3

cardiac muscle

Answer 3

contracts without conscious control but only found in the heart

Question 4

skeletal muscle

Answer 4

type of muscle you use to move

Question 5

role of skeletal muscle

Answer 5

pairs of skeletal muscles contract and relax to move bones at a joint
- act as levers as they are incompressible

Question 6

what are muscles working together to move a bone called

Answer 6

anatagonistic pairs

Question 7

what is the contracting muscle

Answer 7

agonist

Question 8

what is the relaxing muscle

Answer 8

anatagonist

Question 9

what is the cell membrane of the muscle fibres

Answer 9

sarcolemma

Question 11

muscle cells cytoplasm

Answer 11

sarcoplasm

Question 12

what do t tububles do

Answer 12

spread electrical impulses throughout the sarcoplasm so they reach all parts of the muscle fibre

Question 13

what is the sarcoplasmic reticulum

Answer 13

network of internal membranes that run through the sarcoplasm

Question 14

sarcopladmic reticukum role

Answer 14

stores and releases calcium ions that are needed for muscle contraction

Question 15

what are myofibrils

Answer 15

made up of proteins and are highly specialised for contraction
- organelles

Question 16

what are thick myofilaments made of

Answer 16

myosin

Question 17

what are the thin myofilamnets

Answer 17

actin

Question 18

what do dark bands contain / A BANDS

Answer 18

thick myosin filaments with some overlapping thin actin filaments

Question 19

what do i bands contain

Answer 19

only thing actin filaments

Question 20

what is a z line

Answer 20

whole sarconere

Question 21

what is a sarcomere

Answer 21

short unit myofribtils are made up of

Question 22

m line

Answer 22

middle of each sarconere
- middle of myosin filaments

Question 23

h zone

Answer 23

only has myosin filaments

Question 24

what happens at the m like and h zone

Answer 24

myosin and actin slide over eachother to make the sarcomere contract > myofibrils and muscle fibres contract > sarcomere returns to their original length

Question 25

what happens to a bands in sliding filament

Answer 25

stay the same

Question 26

what happens to i bands in sliding filament

Answer 26

shorter

Question 27

what happens to h zone in sliding filaments

Answer 27

shorter

Question 28

what happens to z like

Answer 28

closer together > sarcomere get shorter

Question 29

why do myosin filaments have hinged globular head s

Answer 29

so they can move back and forth

Question 30

what do myosin filaments have

Answer 30

actin binding site
atp binding site

Question 31

what do actin filaments have

Answer 31

actin myosin binding sites

Question 32

what does tropomyson do

Answer 32

helps myofilanets move past eachother

Question 33

where is tropomyosin

Answer 33

between actin filaments