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Biology Worksheet

🫕 Respiratory System

Chapter: Human Body Systems · Level ★★☆ · Time: 20 min
SCORE___ / 20
NameClassDate
After this worksheet you can
Order the airway pathwayExplain alveolar exchangeDistinguish inspiration/expirationRecall lung volumes
📚 Quick Recap

🎯 What you'll practice: The respiratory pathway, alveolar gas exchange, breathing mechanics, and lung volumes.

🧠 Section A · Concept Check ● BEGINNER 4 × 1 = 4

1Gas exchange occurs at the:
2During inspiration, the diaphragm:
3Normal tidal volume is:
4Alveolar surface area is approximately:

🧮 Section B · Problem Solving ● INTERMEDIATE 2 + 3×3 = 11

5Expiration is a process.
6Residual volume is mL.
7List the full airway pathway from nose to alveoli.
8Why are alveoli only one cell thick?
9What is vital capacity?

🚀 Section C · Challenge ● CHALLENGE 5

10Emphysema destroys alveolar walls. Explain how this reduces gas exchange efficiency, using the concept of surface area.
💭 Reflection — the most useful thing I learned:
A ___/4   B ___/11   C ___/5   Total ___/20 Teacher's Signature Parent's Signature
✂ answer key — fold or cut before handing out

1-C   2-B   3-B   4-B  |  5 = passive   6 = 1200   7 = nose/mouth → pharynx → larynx → trachea → bronchi → bronchioles → alveoli   8 = to minimise the diffusion distance for gases, allowing fast exchange with the surrounding capillaries   9 = the maximum volume of air that can be exhaled after a maximum inhalation (about 4800 mL)  |  10 = When alveolar walls break down, adjacent alveoli merge into fewer, larger air sacs, which dramatically reduces the total surface area available for gas exchange even though the lungs may still hold a similar volume of air; since gas exchange rate depends directly on surface area, this reduction means less oxygen enters the blood and less CO2 leaves it per breath, causing the breathlessness seen in emphysema patients.

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