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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 mainly 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.

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.
The trachea (windpipe) is kept open because it is contains rings made from .......
bone
capillaries
cartilage
muscle
Cartilage is a flexible material that keeps its shape. It is found in various places of your body e.g. joints and your nose
2.
Which of the following is NOT true about the effect of exercise?
Breathe more quickly
Heart beats faster
Less oxygen and glucose get to the muscles
Pulse rate increases
The increased flow of blood and increased rate of inhalation means that there is a greater supply of oxygen and glucose to cells. This allows for a greater rate of cellular respiration in the muscle cells
3.
Which of the following statements is FALSE?
Carbon dioxide diffuses into blood plasma from cells.
Carbon dioxide diffuses into the alveoli from the blood.
Carbon dioxide dissolves in white blood cells.
Carbon dioxide is transported in the bloodstream to the lungs.
Carbon dioxide is produced during cellular respiration. It is a waste product and therefore needs to be removed from living cells as efficiently as possible. White blood cells do not transport gases, they are present in the body as a defence system
4.
When we exhale which one of the following is NOT correct?
The volume of the thorax decreases
The air is forced out of the lungs
The diaphragm relaxes
The rib muscles contract
The rib muscles are called intercostal muscles and they relax when you breathe out
5.
When we inhale which one of the following is NOT correct?
More space is formed in the thorax (volume increases)
The air pressure in the chest (thorax) increases
The diaphragm contracts
The rib muscles contract
The air pressure in the chest (thorax) decreases
6.
The diaphragm is .......
a lining of the lungs
a muscle which connects the ribs
a sheet of muscle under the lungs
the windpipe
As this moves downwards, it increases the volume of the chest cavity
7.
Oxygen is transported to all parts of the body by .......
blood plasma
dissolving in water
red blood cells
white blood cells
Red blood cells have no nucleus
8.
Cellular respiration occurs in .......
only cells in the arms and legs
only heart cells
only muscle cells
all cells
OK, all cells isn't quite true. Cellular respiration doesn't take place in hair, nails and claws for example, because their cells are not living
9.
Which two substances are needed for aerobic cellular respiration to take place?
Glucose and carbon dioxide
Glucose and water
Oxygen and glucose
Oxygen and water
Aerobic respiration occurs in animal and plant cells, releasing energy for the cell to use
10.
Which of the following are the products of cellular respiration?
Energy, carbon dioxide and water
Energy, glucose and carbon dioxide
Energy, oxygen and glucose
Energy, oxygen and water
The energy released by cellular respiration is required to keep the cells alive
Author:  Sue Davison

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