SLIDING FILAMENT THEORY

Question 1

myofibril

Answer 1

any of the elongated contractile threads found in striated muscles

Question 2

myofilament

Answer 2

one of the individual filaments of actin or myosin that makes up a myofibril

Question 3

sarcomere

Answer 3

the basic contractile unit of a muscle fibre, composed of actin and myosin filaments

Question 4

actin

Answer 4

a protein that forms the contractile filaments of muscle cells

Question 5

myosin

Answer 5

a protein that forms the contractile filaments of muscle cells

Question 6

H zone

Answer 6

centre of the A band wherer there is no overlap between the thick and thin filaments

Question 7

A band

Answer 7

the region of a striated muscle sarcomere that contains myosim thick filaments

Question 8

Z line

Answer 8

any of the dark bands across a striated muscle fibre that mark the junction of actin filaments in adjacent sarcomeres

Question 9

Tropomyosin

Answer 9

A protein of muscle that forms a complex with troponin regulating the interaction between actin and myosin in muscular contraction

Question 10

Troponin

Answer 10

Cardiac regulatory proteins that are found in the cytoplasm of cardiac naycocytes