ch 10 muscular system review

Question 1

The thick filament is composed of what molecule?

Answer 1

Myosin

Question 2

Flexing the head of this molecule provides what is known as

Answer 2

Power stroke

Question 3

The myosin head contains binding sites for what two molecules

Answer 3

ATP and Actin

Question 4

Three molecules make up the thin filaments

Answer 4

Actin, tropomyosin, and troponin

Question 5

Which molecule has a binding site for myosin heads?

Answer 5

Actin

Question 6

Which molecule covers this binding site?

Answer 6

Tropomyosin

Question 7

Which molecule has a binding site for calcium ions?

Answer 7

Troponin

Question 8

What molecule must bind to the myosin head in order for it to disconnect with Actin?

Answer 8

ATP

Question 9

Hydrolysis of the molecule ATP returns the myosin molecule to what?

Answer 9

The cock-position confirmation

Question 10

Name 3 roles for ATP in the contraction of muscle

Answer 10

Putting the myosin head in cocked, break crossbridge, pump Ca2+ into SR

Question 11

What molecule is connected to the Z line?

Answer 11

Thin filaments

Question 12

What shortens during contraction?

Answer 12

Sarcomere and H zone

Question 13

What is the name of the condition in which muscles become rigid after death?

Answer 13

Rigor Mortis

Question 14

What is Rigor Mortis due to?

Answer 14

Muscles can’t go back to relax state

Question 15

What structures define a sarcomere?

Answer 15

Z discs