When PH level drop in blood respiration rate increase

 

If the blood PH start to decrease, then respiration rate will increase to balance carbon dioxide and oxygen

🩸 Step 1: pH Decreases (More Acidic Blood)

•  Something causes the blood to become more acidic (pH drops below 7.35).

• Common cause: CO₂ levels rise in the blood (from poor breathing, holding breath, or a lung problem).

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🧪 Step 2: CO₂ Forms Acid in the Blood

• CO₂ combines with water (H₂O) in your blood:

  $$\text{CO₂ + H₂O → H₂CO₃ (carbonic acid)}$$

• Carbonic acid then splits into:

  $$\text{H₂CO₃ → H⁺ + HCO₃⁻}$$

• H⁺ ions increase → pH goes down (blood gets more acidic).

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🧠 Step 3: Chemoreceptors Detect the Change

• Special sensors in the medulla oblongata (in the brainstem) and carotid/aortic bodies detect:

  • Low pH

  • High CO₂

  • Sometimes low O₂

• These chemoreceptors send urgent signals to the respiratory control center in the brain.

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🫁 Step 4: Brain Tells You to Breathe Faster and Deeper

• The brain responds by increasing the rate and depth of breathing.

• This is called hyperventilation.

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🌬️ Step 5: More CO₂ is Removed from the Body

• With faster breathing:

  • More CO₂ is exhaled.

  • The CO₂ concentration in the blood decreases.

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⚖️ Step 6: pH Goes Back to Normal

• Less CO₂ → Less carbonic acid → Fewer H⁺ ions

• As a result, the blood becomes less acidic and pH returns to normal (around 7.35–7.45).

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🧠 Summary in Simple Terms:

Step	What Happens
1	Blood pH drops (too much CO₂ = acid)
2	Brain senses low pH and high CO₂
3	Brain increases breathing rate
4	Faster breathing removes CO₂
5	Blood pH rises back to normal