Muscle system

Question 1

Thin filaments are composed of..

Answer 1

Actin

Question 2

Thick filaments are composed of..

Answer 2

Myosin

Question 3

H zone are composed of…

Answer 3

Just thick filaments

Question 4

I band are composed of….

Answer 4

Just thin filaments

Question 5

A Band are composed of…

Answer 5

Thick and thin filaments

Question 6

What happens to a sacromere when a muscle contracts?

Answer 6

Thick and thin filaments slide past each other shortening the sacromere

Question 7

What stays the same during contraction?

Answer 7

A band

Question 8

Components of a reflex arc

Answer 8

1. Receptor
2. Sensory neuron
3. Integration center
4. Motor neuron
5. Effector

Question 9

Contraction steps (5)

Answer 9

1. Binding sites on actin molecules are exposed
2. Cross bridges bind to myosin
3. Cross bridges pull thin filament (power stroke); ADP and P are released from myosin
4. New ATP binds to myosin, releasing linkages
5. ATP splits, which provides power to “cock” the myosin cross bridges
6. repeats steps