1
Q
list the 4 functions of muscle tissue
A
- produce movement
- maintains posture + body position
- stabilises joints
- generates heat
2
Q
list the 4 characteristics of muscle tissue
A
- excitability
- contractibility
- extensibility
- . elasticity
3
Q
list the 3 different types of muscle tissue
A
- skeletal muscle
- cardiac muscle
- smooth muscle
4
Q
list the 3 types of connective tissues that surrounds a muscle fibre
A
- epimysium
- perimysium
- endomysium
5
Q
epimysium
A
- outer membrane
- covers entirely
6
Q
perimysium
A
- surrounds fascicle
7
Q
define fascicle
A
bundle of muscle fibre
8
Q
endomysium
A
- inner layer
- encloses each muscle fibre
9
Q
sarcolemma
A
the plasma membrane that surrounds the cytoplasm
10
Q
what conducts an action potential through protruding into the skeletal muscle
A
T Tubules
11
Q
define myofibrils
A
rod like structures responsible for contraction
12
Q
list the 3 steps of neural stimulation of muscle contraction
A
- Neural Stimulation
- Excitation - contraction coupling
- Contraction - Sliding Filament Theory
13
Q
Muscle Contraction - Step 1: Neural Stimulation
A
- Action Potential arrives at neuromuscular junction
- ACH released binding to channels on sarcolemma
- Influx of NA deploarises sarcolemma
- Graded Potential is generated
- Stimulates AP in sarcolemma
14
Q
Muscle Contraction - Step 2: Excitation
A
- Action Potential travels across sarcolemma
- AP travels along tubules
- Triggers to release CA, which binds to troponin
- Active site exposed
- Myosin head bind to actin active sites and contraction begins
15
Q
Muscle Contraction - Sliding Filament Theory
A
- Myosin heads of thick filaments bind to thin actin filaments
- Myosin heads pull the thin filaments towards centre of sarcomere
- Each sarcomere shortens, each muscle fibre shortens + muscle contracts
BMA - Exam Semester 2
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