structure of a sarcomere

Question 1

sarcomere

Answer 1

when a muscle shortens, many units of contradiction inside the cell are shortening, each unit is called a sacromere

Question 2

myofibrils

Answer 2

divided into bands, creating a dark and light pattern

Question 3

dark bands (z bands)

Answer 3

mark the ends of each sacromere

Question 4

thin filaments

Answer 4

like two strands of pearls, twisted together, with one end attached to a z band

Question 5

actin

Answer 5

gobbler protein that can contract

Question 6

myosin

Answer 6

each thick filament is made of molecules of the protein, stays in place

Question 7

cross-bridge

Answer 7

a change in the concentration of calcium ion causes the myosin head to form a cross bridge to the actin

Question 8

what happens at the level of sacromere when a muscle contracts

Answer 8

the actin is pulled along myosin towards the center of the sacromere until the actin and myosin filaments are completely overlapped, the sacromere must shorten