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10T4 - Excretion and Homeostasis - Coggle Diagram
10T4 - Excretion and Homeostasis
Excretion in flowering plants
Plants excrete excess oxygen and carbon dioxide created through photosynthesis and respiration through stomata in their leaves
Excretory products
Lungs - carbon dioxide
Kidneys - nitrogenous waste and excess water
Skin - sweat which also contains excess water and nitrogenous waste
Roles of the kidney
Filtration - filters out waste products such as water, ions and urea
Selective reabsorption - useful substances such as glucose, ions and water are reabsorbed
Osmoregulation - controlling water content of body
Excretion - removal of waste products from metabolism
Structure of the urinary system
The inner part of the kidney is called the medulla and the outer part is called the cortex
The ureter carries waste products from the kidneys to the bladder to be excreted
The kidney is supplied by the renal artery and the renal vein takes the blood away
Each kidney contains millions of kidney tubules or nephrons
Structure of nephron
See separate annotated diagram
ADH
Anti-diuretic hormone is a hormone that is involved in the control of the less of water as urine
It is released into the pancreas by the pituitary gland when a receptor in the brain detects that the blood is too concentrated
It travels in the bloodstream to the kidney tubules
An increased amount of ADH reaching the tubules increased their permeability to water, so more moves out of the tubule and back into the bloodstream
This results in a smaller volume of more concentrated urine and the blood becoming less concentrated as more water moves out
Urine contains water, urea and ions