Name three types of muscles and state where they are found:

Describe the macroscopic structure of skeletal muscles

What are myofibrils?

Why are muscle fibres not made up of individual cells?

What two proteins/filanments are myofibrils made of?

Describe actin:

Describe myosin:

What is the isotropic (I) band?

What are the anisotropic (A) bands?

Describe the following structures:
a) H-zone
b) Z-line
c) Sarcomere

What are the two types of skeletal muscles?

What is the function of slow twitch muscles?

How are the slow-twitch muscles adapted for their function?

What is the function of fast-twitch muscles?

How are fast-twitch muscles adapted for their function?

What is a neuromuscular junction?

What is a motor unit, and what do they allow?

How does acetylcholine transmit an impulse across a neuromuscular junction?

How is acetylcholine 'recycled' and why?

What is the evidence for sliding filament theory?

Explain how the A band helps support sliding filament theory:

What two proteins is the myosin filament made of?

Describe the structure of actin

Describe the structure of tropomyosin

Summarise sliding filament theory:

How is a muscle stimulated?

How does an action potential cause calcium ions (Ca2+) to leave the sarcoplasmic reticulum?

How do calcium ions (Ca2+) in the sarcoplasm allow cross-bridges to be formed?

How does the cross-bridge cause the actin filaments to move?

How does the cross-bridge break, allowing the myosin heads to return to their original position?

How do muscles relax?