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B3 living & Growing2
OCR Gateway B3 Living an Growing
Question | Answer |
---|---|
The movement of a substance from a region of high to low concentration. | Diffusion |
Molecules enter and leave cells by diffusion through the | Cell Membrane |
Small digested food molecules are absorbed into the blood in the small intestine. Alveoli exchanging gases between the air and blood. | Examples of Diffusion |
Carbon dioxide and oxygen diffuse in and out of plants through the | Leaves |
Food and oxygen reach the foetus, and carbon dioxide and other wastes are removed, by diffusion through the | Placenta |
Transport oxygen | Red Blood Cells |
Defend against disease by engulfing disease organisms | White Blood Cells |
Helps blood clotting | Platelets |
Pumps blood to the lungs | The right side of the heart |
Pumps blood to the rest of the body | The left side of the heart |
Can build up in arteries and restrict or block blood flow and is linked to diet | Cholesterol |
Transport blood away from the heart | Arteries |
In the heart semilunar, tricuspid and bicuspid valves | Prevent Backflow |
In the heart left and right ventricles | Pump Blood |