BY4 - Homestasis
- Created by: beth-marie2511
- Created on: 11-06-16 22:05
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- BY4 - Homeostasis
- Mechanisms by which a constant internal environment is achieved
- Internal Environment - Made up of tissue fluids that bathe cells, supplying nutrients and removing waste
- Maintaining these fluids at an optimum level protects the cells from changes in the external environment
- Changes in temperature, pH and water potential still take place and fluctuate around a set point
- Maintaining these fluids at an optimum level protects the cells from changes in the external environment
- Internal Environment - Made up of tissue fluids that bathe cells, supplying nutrients and removing waste
- All homeostatic processes include a control system
- Detector
- Coordinator
- Effector
- Carry out the corrective procedure to return the factor back to the set point
- E.G. Collecting duct in the nephron in the kidneys
- Carry out the corrective procedure to return the factor back to the set point
- Communicates with one or more effectors
- E.G Pituitary gland - releases ADH hormone
- Effector
- Detects any deviation from a set point
- E.G. Osmo-receptors in the hypothalamus of the brain
- Coordinator
- Negative feedback
- Once the correction is made the condition/ factor returns to the set point
- Information is fed back to the detector and the co-ordinator switches off
- Once the correction is made the condition/ factor returns to the set point
- Detector
- Kidneys
- Osmo-regulation
- The control of water content and solute composition of body fluids
- Homeostatic control of body water
- Kidneys remove anything that causes an imbalance to the water potential
- E.G. Urea
- Formed from the break down of excess amino acids and nucleic acids
- In the liver
- Excess amino acids cannot be stored unlike fats and carbo-hydrates
- Instead they are DEAMINATED (amine group is removed)
- Formed from the break down of excess amino acids and nucleic acids
- E.G. Urea
- Nephron Features
- Glomerulus
- Ultrafiltration
- Bowman's Capsule
- Ultrafiltration
- Bowman's Capsule
- Proximal Convoluted Tubule
- Selective Reabsorption
- Loop of Henle
- Controls solute concentration and water potential
- Distal Convoluted Tubule
- Collecting Duct
- Osmo-regulation
- Glomerulus
- Osmo-regulation
- Mechanisms by which a constant internal environment is achieved
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