B2 extra
- Created by: superlouasaur
- Created on: 20-03-15 17:38
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- B2 extra
- Incubators
- Have a temperature sensor
- A thermostat with a switch, and a heater
- Incubators react to temperature changes
- Negative feedback
- Any change in the system results in an action that reverses the change
- Have a temperature sensor
- Water homeostasis
- Kidneys
- Water homeostasis and exretion
- Control water balance
- By changing the amount of urine you create
- Concentrated urine= lost liquid but same amount of waste
- Water concentration is essential in cells for cell activities
- Alcohol produces a great volume of dilute urine
- Ecstasy cause small volume of concentrated urine
- Kidneys
- ADH
- Receptors in the brain detect changes concentration in the blood plasma
- When the concentration in too high, it triggers the hormone called ADH from the pituitary gland in the brain
- When the concentration in low no ADH is released
- The more ADH the more water is reabsorbed
- ADH travels through the blood to the kidneys. These are the effectors.
- ADH affects the amount of water that can be reabsorbed back into the blood
- When the concentration in low no ADH is released
- When the concentration in too high, it triggers the hormone called ADH from the pituitary gland in the brain
- Ecstasy increases ADH production therefore resulting in a smaller volume (alcohol does the opposite)
- Receptors in the brain detect changes concentration in the blood plasma
- Incubators
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