The Nervous System
- Created by: izzygreenxoxo
- Created on: 24-03-17 18:41
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- Nervous Sysytem
- Sense Organs
- Detect stimuli
- Change in the environment
- e.g. light, pressure, pain, chemical, change in position/temperature
- Change in the environment
- All contain receptors
- Group of cells sensitive to a stimulus
- Change stimulus energy into electrical impulses
- Group of cells sensitive to a stimulus
- Eyes
- Light receptors
- Sensitive to light
- Cells - nucleus, cytoplasm, cell membrane
- Light receptors
- Ears
- Sound receptors
- Sensitive to sound
- Balance receptors
- Sensitive tochanges in position
- Sound receptors
- Nose
- Smell receptors
- Sensitive to chemical stimuli
- Smell receptors
- Tongue
- Taste receptors
- Sensitive to bitter, salt, sweet, sour, savoury (MSG - chemical stimuli
- Taste receptors
- Skin
- Touch receptors
- Sensitive to touch, pressure, pain, temp
- Touch receptors
- Detect stimuli
- Central Nervous System
- Where all info from SO is sent
- Neurones transmit info
- Quickto and from CNS
- Reflexes and actions are coordinated
- 'instructions' sent to effectors which respond
- Consists of Brain + Spinal chord
- Sensory neurones
- Nerve cells carry signals from receptors in SO to CNS
- Relay neurones
- Nerve cells - impulsw from sensory neurone to motor neurone
- Motor neurones
- Nerve cells - signals from CNS to effector (muscles or glands)
- Effectors
- Muscles and Glands (respond in different ways)
- Muscles contract
- Glands secrete hormones
- Muscles and Glands (respond in different ways)
- Sensory neurones
- Where all info from SO is sent
- Synapses
- Connect neurones
- Transfer nerve signals by chemicals diffusing across the gap
- Chemicals set off new electrical signal in the new neurone
- Reflexes
- Automatic response
- Prevent injuries
- Reflex Arc
- Goes through CNS
- 1. Neurones in reflex arc -> spinal chord or unconscious part of brain
- 2. Stimulus detected - impulse sent along sensory neurone to CNS
- 3. Impulse reaches synapse (sensory + relay) - trigger chemical release - cause impulse along relay neurone
- 4. Impulse reach synapse (relay + motor) - trigger chemical release - Chemicals down motor neurone
- 5. Impulse along motor to effector
- 6. Muscle contracts / Gland secretes
- Motor neurone
- Effector
- Response
- 6. Muscle contracts / Gland secretes
- 5. Impulse along motor to effector
- Response
- Effector
- 5. Impulse along motor to effector
- 4. Impulse reach synapse (relay + motor) - trigger chemical release - Chemicals down motor neurone
- 3. Impulse reaches synapse (sensory + relay) - trigger chemical release - cause impulse along relay neurone
- Stimulus
- Receptor
- Sensory neurone
- Relay neurone
- Motor neurone
- Effector
- Response
- Response
- Effector
- 4. Impulse reach synapse (relay + motor) - trigger chemical release - Chemicals down motor neurone
- Motor neurone
- 3. Impulse reaches synapse (sensory + relay) - trigger chemical release - cause impulse along relay neurone
- Relay neurone
- 2. Stimulus detected - impulse sent along sensory neurone to CNS
- Sensory neurone
- Receptor
- 2. Stimulus detected - impulse sent along sensory neurone to CNS
- Automatic response
- Sense Organs
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