Let's solve
Q.3 and
Q.4 step by step.
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✔ Q.3: Label the parts of the human respiratory system on the diagram below.
We are given a list of structures to label:
- Throat
- Bronchi
- Bronchiole
- Larynx
- Trachea
- Lungs
- Mouth
- Epiglottis
- Nose
- Nasal cavity
- Alveoli
- Esophagus
Now, let’s match each part to its correct location in the diagram based on anatomy.
#### Step-by-step labeling (from top to bottom):
1.
Nose – The external opening at the top of the face.
2.
Nasal cavity – Inside the nose; air passes through here.
3.
Mouth – The oral opening below the nose.
4.
Throat – Also called the pharynx; common passage for air and food.
5.
Epiglottis – Flap that covers the larynx during swallowing (located just above the larynx).
6.
Larynx – Voice box; located below the throat.
7.
Trachea – Windpipe; extends from larynx down into the chest.
8.
Bronchi – Two main branches from trachea entering each lung.
9.
Lungs – Large organs on both sides of the chest.
10.
Bronchiole – Smaller branches inside the lungs (from bronchi).
11.
Alveoli – Tiny air sacs at the end of bronchioles where gas exchange occurs.
12.
Esophagus – Tube behind the trachea that carries food to the stomach.
Now, place these labels on the diagram:
-
Top left:
Nose
-
Below nose:
Nasal cavity
-
Right side, near mouth:
Mouth
-
Behind mouth, leading down:
Throat (Pharynx)
-
Just below throat:
Epiglottis
-
Below epiglottis:
Larynx
-
Vertical tube going down neck:
Trachea
-
Splitting into two tubes entering lungs:
Bronchi
-
Large organs on either side:
Lungs
-
Smaller branches within lungs:
Bronchiole
-
Tiny sacs shown in magnified inset:
Alveoli
-
Tube running behind trachea:
Esophagus
> 💡 Note: The
esophagus is not part of the respiratory system but runs alongside it — it's included here because it's anatomically close.
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✔ Q.4: Where is the site of gas exchange in the lungs?
Options:
a) Larynx
b) Bronchi
c) Alveoli
d) Trachea
#### Correct Answer:
c) Alveoli
#### Explanation:
-
Gas exchange (oxygen entering blood and carbon dioxide leaving) occurs in the
alveoli.
- The alveoli are tiny, thin-walled air sacs surrounded by capillaries.
- Oxygen from inhaled air diffuses into the bloodstream, while carbon dioxide from the blood diffuses into the alveoli to be exhaled.
- Other structures like the trachea, bronchi, and larynx are involved in conducting air but
do not perform gas exchange.
✔ So, the
correct answer is: c) Alveoli
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Final Answers:
#### Q.3 Labels (from diagram):
- Top left:
Nose
- Below nose:
Nasal cavity
- Right side (mouth):
Mouth
- Behind mouth:
Throat
- Below throat:
Epiglottis
- Below epiglottis:
Larynx
- Vertical tube:
Trachea
- Splitting into lungs:
Bronchi
- Lungs:
Lungs
- Inside lungs:
Bronchiole
- Inset (tiny sacs):
Alveoli
- Behind trachea:
Esophagus
#### Q.4:
c) Alveoli
Let me know if you'd like a labeled version of the diagram!
Parent Tip: Review the logic above to help your child master the concept of respiratory system worksheet middle school.
