Muscles Flashcards
1
Q
Draw a sarcomere
A
A band H zone Z line myosin heads actin light and dark band labeled
2
Q
Role of calcium ions in muscle contraction
A
- expose actin binding sites for myosin to bind to
- released from sarcoplasmic reticulum
- ions released when action potential arrives at muscle cell
3
Q
What are antagonistic pairs? Give an example
A
- refers to muscles
- one muscle contracts and one relaxes
- example- triceps and biceps
4
Q
What are antagonistic pairs? Give an example
A
- refers to muscles
- one muscle contracts and one relaxes
- example- triceps and biceps
5
Q
What are some physical features of a muscle fiber?
A
muscle fiber= muscle cell
- multinucleated
- within muscle tissue
- surrounded by membrane
6
Q
What is the role of myoglobin in muscle fibres?
A
- acts as an oxygen store
- releases oxygen when oxygen levels are low
- binds oxygen when levels are high
