- 2 kidneys (left and right) - both have separate blood supply - carry out excretion, filtration and osmoregulation
- Which uses process of excretion and filtration.
- from each kidney there is a tube from the kidney to the bladder - the Ureter
Ureter carries urine from the kidney to the bladder
- common bladder for both ureters - urine is conducted to the outside of the body through the urethra down through the vagina or through the penis.
Sunday, 30 October 2011
2.68b - Osmoregulation
- osmo - osmosis
- regulation - to control
1. danger to tissue - blood circulating into the tissue would be concentrated causing a hypertonic tissue fluid (remove to much water) or a hypotonic tissue fluid (add to much water)
2. need to control - achieved by controlling the composition of the blood
kidney controls the composition
excess salts and water is excreted in the kidney so this controls the blood
These maintain the cells functions.
- regulation - to control
1. danger to tissue - blood circulating into the tissue would be concentrated causing a hypertonic tissue fluid (remove to much water) or a hypotonic tissue fluid (add to much water)
2. need to control - achieved by controlling the composition of the blood
kidney controls the composition
excess salts and water is excreted in the kidney so this controls the blood
These maintain the cells functions.
2.68a - Excretion
- blood circulates to the liver and is converted into Urea
- it then re-enters the body and circulates to the kidneys.
- Kidneys then filter the Urea from the blood and the Urea is then added to water to form Urine which then travels down the Uritus
- Then collected in the bladder (form of Urine) - filtered blood then goes back to veins with toxic Urea removed
- it then re-enters the body and circulates to the kidneys.
- Kidneys then filter the Urea from the blood and the Urea is then added to water to form Urine which then travels down the Uritus
- Then collected in the bladder (form of Urine) - filtered blood then goes back to veins with toxic Urea removed
2.67b Human organs of Excretion
- Salt and water is from sweat.
1. Lungs - metabolic waste is carbon dioxide - from respiration
2. Kidneys - excretion of excess water, molecule Urea (nitrogen waste from amino acids) and Salts
3. Skin - excretion of water and salts as sweat and very small amounts of Urea
1. Lungs - metabolic waste is carbon dioxide - from respiration
2. Kidneys - excretion of excess water, molecule Urea (nitrogen waste from amino acids) and Salts
3. Skin - excretion of water and salts as sweat and very small amounts of Urea
2.67a - Excretion in plants
Photosynthesis - leaf absorbs light energy and in this process it combines CO2 with water to form glucose and oxygen (given off as waste molecules)
CO2 + H2O ---> C6H12oO6 + O2 -> excretion
Respiration - glucose and oxygen (aerobic resp.) through enzyme reactions the glucose is broken down and forms ATP , water and carbon dioxide (as waste)
- Carbon dioxide is a metabolic waste - excretion
C6H12oO6 + O2 ---> ATP + H2O + H2O
Glucose molecule is broken down and energy is used to form ATP and get the waste of carbon dioxide and water given off.
The waste process is called Excretion.
CO2 + H2O ---> C6H12oO6 + O2 -> excretion
Respiration - glucose and oxygen (aerobic resp.) through enzyme reactions the glucose is broken down and forms ATP , water and carbon dioxide (as waste)
- Carbon dioxide is a metabolic waste - excretion
C6H12oO6 + O2 ---> ATP + H2O + H2O
Glucose molecule is broken down and energy is used to form ATP and get the waste of carbon dioxide and water given off.
The waste process is called Excretion.
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