Lecture 11: Muscle - Structure & Function Flashcards
1
Q
What’re the three different types of muscle?
A
- Skeletal, Smooth, and Cardiac
2
Q
What are the functions of skeletal muscle?
A
- Movement
- Heat production
- Posture (maintaining posture for long periods of time)
- Communication (diaphragm needs to contract in a certain way to make sounds)
3
Q
What happens when we want to conserve heat?
A
- We shiver
4
Q
What does myo / sarco mean?
A
- Muscle (in Latin & Greek)
5
Q
Transverse leg picture includes:
A
- Fascia, Fat, Skin, Blood Vessels, Nerves, Muscles
6
Q
How is connective tissue arranged?
A
- Epimysium → Fascicle → Covered in perimysium → Muscle Fibre → Wrapped by endomysium
7
Q
How is muscle tissue arranged?
A
- Muscle Fibre → Sarcoplasmic Reticulum → T Tubule → Myofibrils → Myofilaments (in sarcomere)
8
Q
How big is a skeletal muscle fibre?
A
- Up to 40cm, parallel, cylindrical, multi-nuclear
9
Q
What does a skeletal muscle fibre look like?
A
- Striated, protein arrangement
10
Q
Myofilaments are made of…
A
- Thick and thin proteins
11
Q
The thin filaments attached to the sarcomere are made up of…
A
- Mostly Actin (Some Troponin, and Tropomyosin)
12
Q
The thick filaments are made up of…
A
- Myosin heads
13
Q
What is the sarcolemma?
A
- Phospholipid bilayer (membrane)
14
Q
What triggers muscle contraction?
A
- Calcium
15
Q
What is a sarcomere?
A
- A contractile unit
- End-on-end along myofibril length
