Respiration 02
During exercise you breathe more quickly, your heart beats faster and your pulse rate increases.

Respiration 02

This KS3 Science quiz takes a second look at respiration. Breathing provides oxygen for the process of releasing energy in living cells through cellular respiration. In animals and plants, cellular respiration is aerobic. That means that oxygen is involved.

The other material that is required for aerobic cellular respiration is glucose. This is provided by digestion and is transported to body cells dissolved in the blood plasma. The oxygen is carried to body cells by the red blood cells. During cellular respiration, the glucose and oxygen react chemically to produce carbon dioxide and water, both of which need to be excreted from the body. The reaction provides the energy that keeps cells alive.

When you exercise, cellular respiration increases to provide your body with more energy.

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To get more oxygen and glucose to your cells, your heart beats faster to pump more blood around your body and you breathe faster. To inhale, your chest muscles and diaphragm are used to increase the volume of your thoracic cavity. This reduces the pressure inside your lungs and air flows in from the outside through your windpipe. This is kept open and in a tubular shape by rings of cartilage which stop it collapsing in on itself.

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  1. Which of the following are products of respiration?
    The energy is required to keep the cells alive
  2. For aerobic respiration, which two substances are needed?
    Aerobic respiration occurs in animals and plants
  3. Which of the following is NOT true about the effect of exercise?
    The increased flow of blood and increased rate of inhalation means that there is a greater supply of oxygen and glucose to cells
  4. When we exhale which one of the following is NOT correct?
    The rib muscles relax
  5. Which of the following is NOT involved in removing carbon dioxide from the body?
    Carbon dioxide needs to be removed from living cells as efficiently as possible
  6. The diaphragm is .......
    As this moves downwards, it increases the volume of the chest cavity, reducing the pressure in the lungs
  7. When we inhale which one of the following is NOT correct?
    The air pressure in the chest (thorax) decreases
  8. The trachea (windpipe) is kept open because it is made of rings of .......
    Cartilage is a flexible material that keeps its shape. It is found in various places of your body e.g. joints and your nose
  9. Respiration occurs in .......
    OK, all cells isn't quite true. Hair, nails and claws contain cells that don't respire because they are not living
  10. Oxygen is transported to all parts of the body by .......
    Red blood cells have no nucleus so there is more room to carry oxygen

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