Homeostasis

The conditions inside the body must be controlled within narrow limits. these conditions include water content, iron content, body temperature and blood glucose concentration.

THE THERMOREGULATORY CENTRE IS THE PART OF THE BARIN THAT MONITORES AND CONTROLS BODY TEMPERATURE. THE PANCREAS MEANWHILE MONITORS AND CONTOLS BLOOD GLUCOSE CONCENTRATION. IT PRODUCES A HORMONE CALLED INSULIN THAT REDUCES BLOOD GLUCOSE LEVELS. DIABETES IS A DESEASE WHICH CAN BE CAUSED BY INSUFFICIENT INSULIN.

Hypothalamus detects too little water in the blood

Pituaity gland releases ADH

Kidneys maintain blood water level

So less water is lost in urine (urine is more concentrated)

Blood levels return to normal.

WASTE PRODUCTS MUST BE REMOVED FROM THE BODY. IF THEY ARE NOT, THEY WILL INCREASE IN CONCENTRATION AND MAY INTERFERE WITH CHEMICAL REACTIONS OR DAMAGE CELLS. WASTE PRODUCTS THAT MUST BE REMOVED INCLUDE CARBON DIOXIDE AND UREA.

CARBON DIOXIDE IS A PRODUCT OF EAROBIC RESPIRATIOB THROUHG THE LUNGS WHEN WE BREATH OUT.

UREA IS PRODUCED IN THE LIVER WHEN EXCESS AMINO ACIDS ARE BROCKEN DOWN. THE KIDNEYS REMOVE IT FROM THE BLOOD AND MAKE URINE.

WATER ENTERS THE BODY THROUGH FOOD AND DRINK. IF THE AMOUNT OF WATER IN THE BODY IS WRONG, CELLS CAN BE DAMAGED BECAUSE TOO MUCH WATER ENTERS OR LEAVES THEM.

THE PANCREAS MONITORS AND CONTROLS THE CONCENTRATION OF GLUCOSE IN THE BLOOD. IT PRODUCES A HORMONE CALLED INSULIN. INSULIN CAUSES GLUCOSE TO MOVE FROM THE BLOOD INTO CELLS. IT LOWERS THE BLOOD CONCENTRATION IF IT HAS BECOME TO HIGH. THIS CAN HAPPEN AFTER EATEING A MEAL THAT IS RICH IN CARBS.