Biology Chapter 7 - Part 1
- Created by: elliebaxter
- Created on: 29-01-17 11:34
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- Biology Chapter 7 - Part 1
- Homeostasis
- The process by which the body maintains a constant internal environment
- Relies on nervous system, hormones and body organs
- Need to control - water content, ion content, temperature and blood sugar level
- Loose water in sweat, breathing and urine
- Loose ions in sweat and urine
- Need constant body temp or cells and enzymes stop working
- Cells need sugar for energy (controlled by pancreas)
- The process by which the body maintains a constant internal environment
- Removing waste products
- CO2 removed when breathing out
- Urea removed by kidneys in the urine
- Water and ions removed in sweat and urine
- Liver
- Excess amino acids converted into ammonia (deamination) and then urea which passes out in urine
- Ethanol is detoxified and passed out as urine
- Old blood cells are broken down and their iron is used to make new ones
- Kidneys
- Filter blood, excreting unwanted substances
- Producing urine 1) Filtering blood
- 2) Reabsorbing sugar, dissolved ions and needed amount of water
- 3) Releasing urea, excess ions and water in urine
- ADH and water balance of blood
- If water content of blood is too low, pituitary gland secretes ADH into the blood
- Causes the kidneys to reabsorb more water
- If the water content of blood is too high, pituitary gland releases less ADH
- Causes kidneys to reabsorb less water
- As water level rises, less ADH is produced (negative feedback system)
- If water content of blood is too low, pituitary gland secretes ADH into the blood
- Homeostasis
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