Science - The Respiratory System
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What is the function of the breathing system?
To take in oxygen from the atmosphere
To release carbon dioxide and water into the atmosphere
To make sounds, such as speech
Name the part labelled A
Name the part labelled B.
Name the part labelled C
Name the part labelled D
Name the part labelled E
Name the part labelled F
What is the function of the nose?
To warm and clean the air
What is the function of the epiglottis?
To stop food from going down the wrong way
What is the function of the trachea (windpipe)?
To carry air from the nose to the bronchus
What is the function of the rings of cartilage?
To give strength and support to the trachea (windpipe) and keep it open
What is the function of the bronchus?
To allow air to flow into and out of the lungs
What is the function of the bronchioles?
To carry air to and from the air sacs (alveoli)
What is the function of the alveoli (air sacs)?
To put oxygen into the blood and remove carbon dioxide from the blood
Explain what occurs during gaseous exchange.
Oxygen is put into the bbloodstream and carbon dioxide is removed from the blood and released from the body through the nose
How are the alveoli adapted for gaseous exchange?
The walls are very thin so the gases can get through very quickly
There are so many alveoli it provides a large surface area for gaseous exchange
Each alveoli is covered in capillaries so it allows for a quick exchange of oxygen and carbon dioxide
What is the function of the diaphragm?
This is a large sheet of muscle involved in inhalation and exhalation
What is the function of the ribcage and intercostal muscles?
Involved in inhalation and exhalation and also to protect the heart and lungs
What happens during inhalation?
The diaphragm and intercostal muscles contract and the lungs expand
The volume of the ribcage increases and this causes the pressure on the lungs to decrease
As a result the air is sucked in
What happens during exhalation?
The diaphragm and intercostal muscles relax and the lungs return to their original volume
The volume of the ribcage decreases and this causes the pressure on the lungs to increase
As a result the air is forced out
List the factors that affect a persons breathing rate.
Diseases eg. bronchitis, asthma and heart disease
Drugs eg. cocaine, nicotine, sleeping tablets and alcohol
List the disadvantages of smoking.
It can cause lung cancer
It can cause heart attacks
It can cause bronchitus
What would you like to do?
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