Muscles: Parts of Muscle & Sliding Filament Theory Flashcards
1
Q
A muscle consists of many _
A
Muscle Fibres
2
Q
Muscle Fibres consists of many _
A
Myofibrils
3
Q
One Myofibril consists of many connected _
A
Sarcomeres
4
Q
The contractile unit Sacrcomere consists of what 2 contractile proteins?
A
Actin and Myosin
5
Q
Which protein is bigger? Actin or Myosin?
A
Myosin
6
Q
What is the name of the process that describes how sarcomeres contract?
A
The Sliding Filament Theory
7
Q
Actin connects to which line?
A
Z-Line
8
Q
Myosin connects to which line?
A
M-Line
9
Q
What are the head like structures on Myosin that bind to Actin called?
A
Cross-Bridges
10
Q
Describe Process of Muscular contraction in terms of Actin and Myosin
A
- Myosin Cross Bridges attach to Actin
- Mysoin pulls Actin towards it, bringing it closer
- Cross-Bridges dettach
- Process repeats until Actin has been fully pulled in
- Results in a shortened (contracted) sacrcomere
- Many contracted sarcomeres result in a contracted myofibril
- Many contracted myofibrils result in a contracted muscle fibre
- This results in a contracted muscle
11
Q
What is Muscle Tone?
A
When protein filaments do not completely dettach, creating tone. Allows muscles to activate quicker and creates a better looking body.
