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Learning Intentions I can explain the process of homeostasis in the control of blood water concentration if it varies from the norm. I understand the importance.

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Presentation on theme: "Learning Intentions I can explain the process of homeostasis in the control of blood water concentration if it varies from the norm. I understand the importance."— Presentation transcript:

1 Learning Intentions I can explain the process of homeostasis in the control of blood water concentration if it varies from the norm. I understand the importance of water control and what happens to the body if control is not maintained. I can give a detailed explanation of how ADH affects the kidneys in response to low blood water concentration. Success Criteria I can describe the role of the hypothalamus and pituitary gland in the hormonal control of blood water concentration. I can give detail of how ADH affects the kidney tubules.

2 Our bodies gain water in 3 different ways:Our bodies gain water in 3 different ways: Drinking waterDrinking water Eating foodsEating foods Chemical reactions – e.g. respirationChemical reactions – e.g. respiration

3 Our bodies lose water in 4 different ways:Our bodies lose water in 4 different ways: UrineUrine Faeces (moist faeces are expelled more easily)Faeces (moist faeces are expelled more easily) Breathing outBreathing out Sweating (evaporation of water keeps the body cool)Sweating (evaporation of water keeps the body cool)

4 Water Balance Our kidneys ensure that the water concentration of our bodies always stays the same:Our kidneys ensure that the water concentration of our bodies always stays the same: Water Gain = Water Loss Water Gain = Water Loss

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6 Water Regulation The kidneys regulate water, but this is controlled by the brain.The kidneys regulate water, but this is controlled by the brain. The brain produces ANTI-DIURETIC HORMONE (A.D.H.) which controls the volume of water reabsorbed by the kidney nephrons.The brain produces ANTI-DIURETIC HORMONE (A.D.H.) which controls the volume of water reabsorbed by the kidney nephrons. Different volumes of ADH are produced to suit the varying water conditions of the body, ensuring water balance is maintained.Different volumes of ADH are produced to suit the varying water conditions of the body, ensuring water balance is maintained.

7 Bowmans Capsule ADH control Animation

8 Water content of blood normal High volume of water passes into blood Low volume of water passes into blood High volume of water reabsorbed by kidney Low volume of water reabsorbed by kidney Water content of blood too low Water content of blood too high Salt eaten or much sweating Too much water drunk Role of ADH Small volume of concentrated urine passed to the bladder High volume of dilute urine passed to the bladder Brain releases a lot of ADH Brain releases little ADH

9 High Water Conc. In Blood Less ADH released from brainLess ADH released from brain Less water reabsorbed from the nephron into the bloodLess water reabsorbed from the nephron into the blood High quantity of dilute urine producedHigh quantity of dilute urine produced Water conc. of blood returns to normalWater conc. of blood returns to normal

10 Low Water Conc. In Blood Lots of ADH released from the brain.Lots of ADH released from the brain. Lots of water reabsorbed from the nephron into the blood.Lots of water reabsorbed from the nephron into the blood. Low volume of concentrated urine is producedLow volume of concentrated urine is produced Water conc. of the blood returns to normalWater conc. of the blood returns to normal


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