Muscles Flashcards
1
Q
Where is Ca2+ released from?
A
Sarcoplasmic reticulum
2
Q
How are muscle fibres specialised? (3)
A
- Contain several nuclei
- Surrounded by thin cell membrane - sarcolemma
- Sarcoplasm contains large no. of mitochondria
3
Q
What does the A-band represent?
A
Myosin
4
Q
What does the I-band represent?
A
Actin
5
Q
What does the H-zone represent?
A
Only Myosin
6
Q
How long is a sarcomere?
A
Z-disc to Z-disc
7
Q
A
8
Q
A
9
Q
A
10
Q
A
11
Q
A
12
Q
A
13
Q
A
14
Q
A
15
Q
What does ATP cause when binds to myosin head? (2)
A
- Breaks cross bridge
- Releases energy + changes shape of myosin head
16
Q
What other things does Ca2+ do? (2)
A
17
Q
Describe slow twitch muscle fibres? (4)
A
- Used for slow contractions
- Less phosphocreatine
- Aerobic respiration involved
- Many mitochondria
18
Q
Muscle Question Pack
A
