The Respiratory System
ICSE · Class 9 · Biology
Flashcards for The Respiratory System — ICSE Class 9 Biology. Quick Q&A cards covering key concepts, definitions, and formulas.
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See them allDefine respiration and write its overall chemical equation.
Answer
Respiration is the chemical process of releasing energy by breaking down glucose for carrying out life processes. Chemical equation: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy (Glucose + Oxygen → Carbon di…
What is ATP and why is it called the 'currency of energy' inside the cell?
Answer
ATP (Adenosine Triphosphate) is a chemical substance that stores energy released during glucose breakdown. It is called the 'currency of energy' because: - Energy is stored in ATP molecules - When ene…
Why do animals need more energy than plants? Give three reasons.
Answer
Animals need more energy than plants because: 1. They have to move about for obtaining food and escaping enemies 2. They need to chew food and care for their young ones 3. Birds and mammals need extra…
Compare aerobic and anaerobic respiration in terms of oxygen requirement, products, and energy yield.
Answer
Aerobic Respiration: - Requires oxygen - Products: CO₂ + H₂O + 38 ATP - High energy yield (686 kcal/mole) Anaerobic Respiration: - No oxygen required - Products: Lactic acid (animals) or Ethanol + CO…
What is oxygen debt and when does it occur in our body?
Answer
Oxygen debt occurs when muscles work very fast but don't get enough oxygen, leading to anaerobic respiration. This happens during: - Fast running - Swimming - Wrestling - Weight-lifting Lactic acid a…
List the four major parts of respiration in humans.
Answer
The four major parts of respiration in humans are: 1. Breathing - Physical process of taking in and forcing out air from lungs 2. Gaseous transport - Oxygen carried by RBCs as oxyhaemoglobin, CO₂ tran…
Name the respiratory organs in humans and their functions.
Answer
Respiratory organs and their functions: 1. Nose - Warms, moistens air; traps particles; smell detection 2. Pharynx - Common passage for air and food 3. Larynx - Voice production (contains vocal cords)…
What are alveoli and why are they important for respiration?
Answer
Alveoli are tiny air sacs at the end of bronchioles where gas exchange occurs. They are important because: - Extremely thin walls (one-cell thick) allow easy gas diffusion - Surrounded by network of b…
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