Structure of Muscle Part 1 Flashcards
What are muscles responsible for?
All movement of the body
What are the 3 basic types of muscle?
- skeletal
- cardiac
- smooth
Where is skeletal muscle found?
Limbs
- inc all voluntary muscle / muscles you can control
Where is cardiac muscle found?
Heart
Where is smooth muscle found?
Viscera
Describe the structure of skeletal muscle
- striated
- multi-nucleated
- body energy converters
Describe the structure of cardiac muscle
- striated
- 1 nucleus
Are skeletal muscles voluntary or involuntary?
Voluntary
Are cardiac muscles voluntary or involuntary?
Involuntary, automatic
Are smooth muscles voluntary or involuntary?
Involuntary
What are properties of muscle?
- excitability (responsiveness)
- contractility
- extensibility
- elasticity (recoil)
What are the functions of the skeletal muscles?
- movement
- maintenance of posture & body position
- heat production & store nutrient reserves
- protects bones & internal organs
What 2 terms about fibres are used interchangeably?
Muscle cell and muscle fibre
How long does a muscle fibre extend?
Each muscle fibre extends from one end of the muscle to the other end.
List the organisation of the skeletal muscle from the outside inwards.
- epimysium
- perimysium
- endomysium
- fascicle
- muscle fiber
What is the epimysium?
- layer of collagen fibres surrounding the muscle
- connected to deep fascia
- separates muscle from surrounding tissues
What is the perimysium?
Surrounds fascicles
Contains:
- collagen fibres
- elastic fibres
- blood vessels
- nerves
What is the endomysium?
Surrounds individual muscle cells
Contains:
- capillary networks
- myosatellite cells (stem cells that repair damage)
- nerve fibre
What do the collagen fibres of the epimysium,
perimysium and endomysium form?
Come together at base of muscles to form:
- tendon (bundle of fibres) connected to the bone
- aponeurosis (sheet of fibres)
Why do the collagen fibres of the epimysium,
perimysium and endomysium come together?
To attach skeletal muscles to bones
