Urinary System
Do Now: Write down 3 things you know about the
Urinary system.
,(a) the term excretion and it’s
importance in maintaining
metabolism and homeostasis.
,Definitions
Excretion
The removal of metabolic waste from the body
Metabolism
The sum of the chemical reactions in the body
Homeostasis
The maintenance of a constant internal environment
despite changes
Egestion
The removal of faeces from the body
, Main waste products
Carbon dioxide is produced by every living cell by
respiration. It is excreted by the lungs.
Nitrogenous compounds e.g. urea which is
produced in the liver. Urea is transported to the
kidneys for excretion.
Bile pigments are formed from the breakdown of Hb
from old RBCs in the liver. Excreted in bile into the
small intestine.
Do Now: Write down 3 things you know about the
Urinary system.
,(a) the term excretion and it’s
importance in maintaining
metabolism and homeostasis.
,Definitions
Excretion
The removal of metabolic waste from the body
Metabolism
The sum of the chemical reactions in the body
Homeostasis
The maintenance of a constant internal environment
despite changes
Egestion
The removal of faeces from the body
, Main waste products
Carbon dioxide is produced by every living cell by
respiration. It is excreted by the lungs.
Nitrogenous compounds e.g. urea which is
produced in the liver. Urea is transported to the
kidneys for excretion.
Bile pigments are formed from the breakdown of Hb
from old RBCs in the liver. Excreted in bile into the
small intestine.
