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The nervous system and responding to stimuli (Environment (Animals…
The nervous system and responding to stimuli
Environment
Responding helps organisms SURVIVE
Animals increase their chances of survival
Responding to changes (hot/cold)
Respond to INTERNAL ENVIRONMENT
Chemical Reactions INSIDE the body
Plants increase changes of survival by responding
Stimulus
Change in internal/external environments
Receptors detect STIMULI
Receptors in SENSE ORGANS
Eyes, ears, nose, tongue, skin
Detect EXTERNAL stimuli
Cone cells in the eye detect light
Effectors
Cells that being about a response to stimuli
Muscle cells in the GLANDS (pancreas)
Respond in different ways
RECEPTORS communicate with effectors
Via the NERVOUS SYSTEM
Via the HORMONAL SYSTEM
Sometimes BOTH
CENTRAL NERVOUS SYSTEM
Made up of NEURONES
Sensory
Relay
Motor
Brain and Spinal Chord
Receptors send ELECTRICAL IMPULSES through the SENSORY NERVE CELLS
Coordinates the response
High speed electrical impulses
Quick responses
SYANPSES
Connect NEURONES
Between 2 neurones
Neurotransmitters
Chemical that diffuses across the gap