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?
What is the isotropic (I) band?
What are the anisotropic (A) bands?
Describe the following structures:
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?