5. When we breathe in, our chest muscles move upwards and outwards and our diaphragm moves downwards. Explain why this is.
6. In which part of the respiratory system does the oxygen from the air we breathe in pass into our blood? Tick the correct answer.
- alveoli
- bronchus
- trachea
7. The circulatory system helps oxygen-rich blood travel around our body to different organs.
- true
- false
8. Why do we breathe out carbon dioxide?
Answer (2)
During inhalation, chest muscles and the diaphragm contract to allow air into the lungs, where oxygen is exchanged for carbon dioxide in the alveoli. The circulatory system transports oxygen-rich blood throughout the body, while carbon dioxide is exhaled as a waste product. The chosen correct answer for question 6 is 'alveoli.'
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When we breathe in, our chest muscles move upwards and outwards, and our diaphragm moves downwards to create more space in the chest cavity. This process increases the volume inside the chest and decreases the pressure, allowing air to flow into the lungs. The diaphragm is a dome-shaped muscle located below the lungs. As it contracts and moves down, it flattens, which further increases the chest cavity's volume.
In which part of the respiratory system does the oxygen from the air we breathe in pass into our blood? Tick the correct answer.
Correct Answer: alveoli
The oxygen from the air we breathe in passes into our blood through the alveoli. Alveoli are tiny air sacs located at the ends of the bronchioles in the lungs. They have thin walls and are surrounded by capillaries, where oxygen passes into the blood, and carbon dioxide transfers from the blood to the alveoli to be exhaled.
The circulatory system helps oxygen-rich blood travel around our body to different organs.
Correct Answer: true
The circulatory system, consisting of the heart, blood, and blood vessels, carries oxygen-rich blood from the lungs to different parts of the body. It delivers oxygen and nutrients to cells and removes waste products like carbon dioxide.
Why do we breathe out carbon dioxide?
We breathe out carbon dioxide because it is a waste product of the process our body's cells use to generate energy. During cellular respiration, oxygen is used to convert glucose into energy, and carbon dioxide is produced. The body needs to expel this carbon dioxide to maintain a proper balance and prevent it from accumulating to harmful levels.
