Excretion • Excretory organs and excretory products• The importance of excretion• Urinary system in human • Function of kidney• The importance of maintaining healthy

kidney• Excretion in plants

Human excretion Excretion is the removal of metabolic waste product from the

body.

Metabolism – chemicals reaction in the body

Take in oxygen, digested food

Remove - _______, __________, _______

Excretory organs Excretory organs – remove waste products from the body

3 excretory organs and its waste products:

Skin: ________, ________, __________

Lung:________, ________

Kidney:________, ________, __________

The importance of excretion To maintain healthy body

Become toxic when (urea) accumulate in the body

Become ill – some organs will damage

Can be death

Higher concentration of carbon dioxide can increase breathing rate

The Urinary System in Man

Structure of The Kidney

Functions of The Kidney

Kidney filter wastes from the blood

Regulate water and chemical balance in the body

GFR - Glomerular filtration rate Glomerular filtration rate (GFR) is a test used to check

how well the kidneys are working. Specifically, it estimates how much blood passes through the glomeruli each minute. Glomeruli are the tiny filters in the kidneys that filter waste from the blood.

The GFR test is recommended for people with chronic kidney disease. It is also recommended for persons who may get kidney disease due to:

Diabetes

Family history of kidney disease

Frequent urinary tract infections

Heart disease

High blood pressure

Urinary blockage

IMPORTANCE OF MAINTAINING HEALTHY KIDNEY To prevent kidney from damage

Food with too much chemicals (mercury, lead, arsenic) can damage the kidney

Too salty ( cause hypertension – lead to kidney stones) or too sweet (can cause diabetes) food also can damage kidney

Ways to improve kidney : drinks 8 glasses of water per day, regular exercise

Kidney failure: dialysis or kidney transplant.

Dialysis Dialysis – blood is filter through an artificial membrane (separate

particles of different sizes)

Two types of dialysis:

haemodialysis,

protoneal dialysis