Part of the brain that controls our internal environment, including water balance and body temperature.

An organ or tissue that produces and secretes substances, such as hormones.

A chemical substance produced by a gland that travels in the bloodstream to a specific target organ.

Anti-diuretic hormone, secreted by the pituitary gland, which increases the permeability of the kidney tubules.

The roles of the nervous and endocrine systems in controlling water balance

Biology

Effect of osmosis and sugar concentration on the mass of plant tissue: practical

Effect of osmosis and sugar concentration on the mass of plant tissue: analysis

Using a microscope to observe effects of osmosis in plant cells: practical

The importance of maintaining constant conditions in the body

The importance of maintaining constant conditions in the body, including osmosis

The role of the skin in thermoregulation

The role of the nervous system in thermoregulation

Controlling water balance: the kidneys, and nephron structure

Pupils will learn about factors that affect the rate of photosynthesis in plants, including temperature, light intensity and carbon dioxide concentration.

Pupils learned how substances essential for chemical reactions, and the products of the reactions, are transported into, around and out of plants, and about factors affecting the rate of water uptake by a plant.

This unit covers the importance of maintaining a constant internal environment, focusing on body temperature control, osmotic balance, and kidney function. It explains the roles of the skin, kidneys, and ADH, and emphasises data extraction, experiment techniques, and accurate data interpretation.

Coordination and control: maintaining a constant internal environment

Match each body system to its correct description.

Which part of the brain detects changes in the water balance of the blood plasma?

The hormone ADH (anti-diuretic hormone) is secreted by the {{}} gland in the brain.

True or false? The hormone ADH is secreted when there is less water in the blood than normal.

Decreases permeability of the kidney tubules so less water is reabsorbed.

Decreases permeability of the kidney tubules so more water is reabsorbed.

Increases permeability of the kidney tubules so less water is reabsorbed.

Increases permeability of the kidney tubules so more water is reabsorbed.

Increases the production of ADH, so less water is reabsorbed.

Increases the production of ADH, so more water is reabsorbed.

Suppresses the production of ADH, so less water is reabsorbed.

Suppresses the production of ADH, so more water is reabsorbed.

What effect does drinking alcohol have on the control of water balance in the body?

It is important that the amount of water in the human body is kept ...

Which organ detects changes in water levels in the human body?

The brain detects the amount of water in the ...

Which organ responds to changes in water levels in the human body by filtering and reabsorbing water from the blood?

Water moves between cells and blood plasma by the process of ...

The concentration of water molecules would be higher in the blood than in cells.

Water would move by osmosis into cells, down the concentration gradient.

Put the sentences in the correct order to explain what would happen to body cells if there was a very high level of water in the blood.

Starter Quiz

It is important that the amount of water in the human body is kept ...