GCSE BIOLOGY- B10
- Created by: meganstodd
- Created on: 15-10-18 16:14
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- B10
- Homeostasis
- Constant Internal Environment
- optimal conditions for enzyme action and cell function.
- water content, body temp, blood glucose concentration
- Glucose= energy source for all cells. glucose levels controlled by pancreas
- Constant Internal Environment
- Nervous System
- receptor cells detect stimuli.
- receptor cells found in sense organs eg. eyes, ears, nose, mouth and skin.
- Brain and spinal chord make up the central nervous system (CNS).
- Motor neurons help your body to move such as muscles or glands.
- Reflex Actions
- Receptor detects a stimulus, sensory neuron transfers to CNS, relay neurone in CNS passes the impulse on, motor neurone stimulated, passes impulse to effector, action is taken.
- A gap between 2 neurones is called a synapse
- A sequence from a receptor to effector is a reflex arc
- chemicals transmit the impulse across the gap
- KERBOODLE LINK
- FROG SITE
- Homeostasis
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