Muscles 3.6.3 Flashcards
1
Q
What are 3 types of muscles?
A
- Smooth
- Cardiac
- Skeletal
2
Q
What is an antagonistic pair of muscles?
A
- One muscle contracts, one muscle relaxes
3
Q
What are muscles made up of?
A
muscle fibres
4
Q
What organelles do muscle fibres contain?
A
- myofibrils
5
Q
What is the cytoplasm of a myofibril called?
A
- Sarcoplasm
6
Q
What is the membrane of a myofibril called?
A
- Sarcolemma
7
Q
What are 2 components of the sarcolemma called?
A
- T-tubules
- Sarcoplasmic reticulum
8
Q
Outline the role of T-tubules
A
- Send electrical impulses throughout the sarcoplasm and fibre
9
Q
Outline the role of sarcoplasmic reticulum
A
- Stores calcium ions needed for contraction.
10
Q
What do myofibrils contain?
A
- Thin and thick myofilaments
11
Q
What are the two myofilaments? (state the level of thickness)
A
- Myosin (Thick)
- Actin (Thin)
12
Q
What is a sarcomere?
A
- A single contractile unit
13
Q
What is the Z line?
A
- The point which marks the end of the sarcomere.
14
Q
How does myosin and actin appear?
A
- Myopsin is darker
- Actin is lighter
