Muscle- movement and types
- Created by: vezting
- Created on: 20-04-16 14:06
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- Muscle movement & types of muscle
- components of elbow joint
- cartilage reduces friction
- synovial membrane produces synovial fluid
- synovial fluid lubricates the joint
- ligaments hold the bones together to prevent dislocation
- elbow is an example of a synovial joint
- muscle movement
- muscles only produce force when they contract
- movement at joints needs more than one muscle
- muscles work i pairs and they are opposite. this is antagonistic pairing.
- muscle contraction
- 1: impulses arrive at the neuro muscular junction causing vesicles to fuse with the pre-synaptic membrane and release acetylcholine into the gap
- 2: acetylcholine binds to the receptors on the sarcolemma
- 3: this causes depolarisation
- 4: depolarisation waves travel down the t-tubules also know and the t-system
- 5: t-system depolarisation leads to ca2+ released from stored in sarcoplasmic reticulum
- 6: this then leads on the the sliding filament model.
- 7: acetylcholine- esterase rapidly breaks down acetylcholine so contractions only occur when the impulses arrive
- muscle types
- muscles are formed of cells elongated to form fibres
- smooth muslce
- also know as involuntary muscles
- innervated by neurones of the autonomic nervous system
- contractions are not under conscious control Eg intestine or bronchioles
- cardiac muscle
- contract on their own - myogenic
- muscles fibres connected by intercollated discs
- has low eletrical resistance so nerve impulses pass easily from cell to cell
- branching helps spread evenly
- each fibre has a nucleus and some cross striations
- voluntary muscle
- contraction is controled consciously
- many muscle fibres, multi- nucleate, regular cross striations
- contraction leads to movement of skeleton joints
- many mitochondria and many myofibrils
- components of elbow joint
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