M2 Sliding Filament Theory

Question 1

Skeletal muscle cells and fibres structure

Answer 1

Multiple nuclei, space in muscle fibre is occupied by myofilaments

Question 2

Muscle cell structure

Answer 2

Sacroplasm - cytoplasm of cell contains myoglobin and glycogen
Sarcolemma- membrane of muscle cells regulates entry and exit or materials
Sarcoplasmic reticulum- smooth er in muscle cells stores and releases calcium to cause contractions

Question 3

Sarcoplasmic reticulum function

Answer 3

Sarcoplasmic reticulum- smooth er in muscle cells stores and releases calcium to cause contractions

Question 4

Sarcolemma function

Answer 4

Sarcolemma- membrane of muscle cells regulates entry and exit or materials

Question 5

Sacroplasm function

Answer 5

Sacroplasm - cytoplasm of cell contains myoglobin and glycogen

Question 6

What is myoglobin

Answer 6

Iron containing protein, carried and stores oxygen

Question 7

What is myofibrils

Answer 7

Composed of myofilaments like actin and myosin

Question 8

What is a sarcomeres

Answer 8

Actin and myosin aranaged in repeating units

Question 9

What is actin

Answer 9

Thin myofilament
Troponin and tropomyosin are ion receptor proteins that block binding sites

Question 10

Whag is myosin

Answer 10

Thick filament
Two polypeptide chains wrapped around eachother, ends have globular heads

Question 11

Steps of muscle contraction

Answer 11

Depolarization and calcium release
Actin and myosin cross bridge formation
Sliding mechanism of actin and myosin
Sarcomere shortening (muscle contract)