Sliding Filament Theory

Question 1

What does sac and myo mean?

Answer 1

Sac- Greek word for muscle
Myo - Latin word for muscle

Question 2

What happens in the myofibrils

Answer 2

1. Myofibrils are made up of myofilament which are contractile proteins
2. Actin and mysoin are microfilaments
3. A band is darker and is where actin and myosin over lap
4. Z disc and I band are located where ther is no overlapping between the two
5. The proteins bind together and contract which is known as the smallest contraction unit sacromere

Question 3

How does Myosin head bind to the actin receptors?

Answer 3

1. Myosin wants to bind to the actin receptor but there is tropomyosin and troponin so it has to use Ca+ ions to break it down
2. Once it is broken down ATP dissociates itself into ADP and phosphate and binds to the myosin allowing it to bind to the action receptor
3. After binding ADP and phosphate is released and but the myosin is still binded to the actin so it needs ADP and phosphate again to be released and the cycle happens over and over again

Question 4

What does tintin do?

Answer 4

It holds the myosin so when it contracts it springs back

Question 5

What is the structure of the whole muscle?

Answer 5

Whole muscle has fascicle, then inside there is muscle fibre which are made from myocytes