Excretion and Urea

excretion

removal of waste products of metabolism and substances in excess of requirements

what do metabolic reactions produce sometimes

some substances that are toxic and must be removed

do plants respire

yes

what is a product in plant respiration used for

carbon dioxide for photosynthesis

what isn’t a waste products for plants during the day

carbon dioxide

plants don’t photosynthesise during the night so what happens to the carbon dioxide produced during respiration

leaves plant cell through stomata

urea

waste product produced from the breakdown of excess amino acids

where is urea broken down

liver

too much __ in the blood is toxic

urea

urine

solution of urea and other waste materials in water

where is urine produced

kidneys

contents of urine (4)

water

urea

excess salts

excess ions

ureters

pair of tubes that carry urine from kidneys to the bladder

urethra

tube that carries urine from bladder to outside body

sphincter muscles

found at entrance of urethra which relax to let urine through