Teaching the Sliding filament model
Storyboard-Text
- Teacher's VoiceOver:
- Hi class, today's topic is Muscle Movement. We will be learning the processes involved during a somatic reflex response and a muscle contraction (Sliding Filament Theory).
- Today's Topic: Muscle Movement
- Welcome to Kinesiology Class!
- Sounds fun! YAY!
- Teacher's VoiceOver:
- The signal goes through your nervous system to your muscle. Your muscle contracts, and yourbonesmove. And all this happens incredibly fast.
- Today's Topic: Muscle Movement
- What makes a muscle contract, if you guys are wondering? A muscle contracts by starting a signal from the nervous system.
- Welcome to Kinesiology Class!
- Today's Topic: Muscle Movement
- Thisapplies to a daily life example we all do: brushing our teeth! Let me show you what important steps and components are involved in each of the processes on the monitor.
- Wow!
- Teacher's VoiceOver:
- Teacher's VoiceOver:
- When you decide to brush your teeth whenever just before the biceps brachii (a skeletal muscle that is involved in the movement of the elbow and shoulder)is activated, a message originates and is then released from the central nervous system, specifically at the elbow flexor control centre of the brain.
- .
- Messagereleased from CNS
- The message travels down the spinal cord and branches off at the shoulder level and goes to the peripheral nervous system. The message then travels from the axon branch to the axon terminal of the elbow flexors. Only a few muscle fibres (a little motor unit) will be used since the weight of the toothbrush is very light.
- .
- Message travels from the axon branch to the axon terminal of the elbow flexors.
- Calcium ions
- The message is carried through the axon terminal via acetylcholine to the sarcolemma of each muscle fibre included. ACh causes to release calcium ions and then bind to troponin, proteins that are located on the actin's tropomyosin.
- .
- Troponin
- Rotated tropomyosin
- .
- The tropomyosin rotates, causing the binding sites to be exposed for the myosin on the actin filament.
- Actin binding sites
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