Sub-strand: Growth and Changes
The Respiratory System
The Different Body Organs and their functions
- The respiratory system helps us breathe.
- It has parts like the lungs and windpipe.
- We breathe in oxygen and breathe out carbon dioxide.
- The lungs send oxygen to the heart, which spreads it through the body.
- The windpipe cleans the air before it reaches the lungs.
- Mucous helps protect us from germs.
- Oxygen gives us energy from food.
- Dirty air can harm our lungs.
The Different Body organs And their Functions
- Nasal Cavity – Cleans and warms the air we breathe.
- Pharynx – A tube that moves air from the nose to the windpipe.
- Larynx (Voice Box) – Helps us talk.
- Trachea (Windpipe) – Carries air to the lungs.
- Bronchus – Sends air into each lung.
- Right & Left Lungs – Take in oxygen and remove bad air (carbon dioxide).
- Diaphragm – A muscle that helps us breathe.
- Pleural Cavity – Helps the lungs move easily.
- Epiglottis – Stops food from going into the windpipe.
CARE OF THE RESPIRATORY SYSTEM
1. Increase your walking speed.
2. Maintain a healthy weight.
3. Stay hydrated.
4. Avoid smoking cigarettes and inhaling drugs.
5. Wash your hands frequently.
6. Reduce smoking and alcohol intake.
GAS EXCHANGE IN THE LUNGS
- Oxygen moves from the lungs into the blood.
- Carbon dioxide moves from the blood into the lungs to be breathed out.
- This happens in tiny air sacs called alveoli and small blood vessels called capillaries.
IMPORTANCE OF FRESH AIR
- Fresh air is good for digestion.
- Improves your blood pressure and heart rate.
- It makes you happier.
- Strengthens your immune system.
- Fresh air cleans your lungs.
- You will have more energy and sharper mind
Questions
Multiple Choice Questions
- What is the main function of the respiratory system?
a) To help us digest food
b) To help us breathe and get oxygen
c) To help us run faster
d) To pump blood - Which part of the respiratory system cleans and warms the air we breathe?
a) Lungs
b) Trachea
c) Nasal cavity
d) Diaphragm - What is the role of the lungs?
a) To filter blood
b) To take in oxygen and remove carbon dioxide
c) To help with digestion
d) To produce mucus - What does the diaphragm do?
a) Helps us breathe
b) Pumps blood
c) Breaks down food
d) Filters the air - What happens during gas exchange in the lungs?
a) Oxygen moves from the lungs into the blood
b) Carbon dioxide moves from the blood into the lungs
c) Both a and b
d) None of the above
Part 2: True or False
- The windpipe (trachea) carries air to the lungs. (True/False)
- The epiglottis helps us talk. (True/False)
- Smoking is good for the lungs. (True/False)
- Fresh air helps clean our lungs. (True/False)
- The lungs send oxygen to the heart, which spreads it through the body. (True/False)
Part 3: Fill in the Blanks
- The _______ stops food from going into the windpipe.
- The tiny air sacs in the lungs where gas exchange happens are called _______.
- The _______ cleans the air before it reaches the lungs.
- Breathing in oxygen is called _______.
- The respiratory system helps us get _______ from the air.
Part 4: Short Answer Questions
- Why is fresh air important for our lungs?
- Name two ways to take care of the respiratory system.
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