quiz respiratory

 ESC

F2

Practice Problems

1. Which of the following structures changes the volume of the lungs?

A. Alveoli

B.Heart 

C Trachea 

D. Diaphragm

3. Which of the following statements best describes the 

primary function of the respiratory system?

A. It transports oxygen and carbon dioxide to cells all over the body.

B. It involves the inhalation and exhalation of gases into the environment.

D. Diaphragm

C. It exchanges gases between the blood and the air in an environment.

D. It maintains proper blood level pH.

2. Which of the following statements best explains how the structure of alveoli relates to its function?

1. Alveoli are large to maximize gas exchange.
2. The walls the alveoli are thin to increase the rate of diffusion.
3. The walls of the alveoli are thick to prevent pressure buildup.
4. Alveoli are small to increase the transportation of cells.

4. Which of the following correctly describes the makeup of the lungs?

1. Right lung, three lobes; left lung, two lobes
2. Right lung, two lobes; left lung, two lobes
3. Right lung, two lobes; left lung, three lobes
4. Right lung, three lobes, left lung three lobes

5. In two to three sentences, describe what will occur in the blood if the tidal volume in the lungs increases.

Lungs surfactant insufficiency

 

🔑 Main Function of Surfactant:

• Reduces surface tension inside the alveoli.

• Helps keep the alveoli open and stable during breathing.

• Prevents alveoli from collapsing during exhalation.

Think of surfactant like soap bubbles – it keeps the walls of alveoli from sticking shut.

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🚫 What Happens When Surfactant is Insufficient?

If there’s not enough surfactant:

1. High Surface Tension

• Alveoli become unstable and tend to collapse (called atelectasis).

2. Harder to Breathe

• The lungs become stiff (low compliance), making it harder to expand during inhalation.

3. Less Oxygen Exchange

• Collapsed alveoli mean less oxygen enters the blood.

• This leads to hypoxia (low oxygen levels in the body).

4. Respiratory Distress

• The person may breathe rapidly, grunt, or flare nostrils to try to get air.

• In newborns, this is called Neonatal Respiratory Distress Syndrome (NRDS).

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🧒 Common in:

• Premature babies (especially before 32–34 weeks gestation): Their lungs haven’t made enough surfactant yet.

• Adults with lung injury, such as Acute Respiratory Distress Syndrome (ARDS): surfactant can get damaged or washed away.

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🧪 Symptoms of Surfactant Deficiency:

• Difficulty breathing

• Cyanosis (bluish lips or skin)

• Low oxygen levels

• Retractions (chest wall pulling in with each breath)

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💊 Treatment:

• Surfactant replacement therapy (injected into the lungs, usually for premature infants)

• Oxygen support or mechanical ventilation

• Steroids before birth (to help mature the lungs if early delivery is expected)

Impede

 Impede နှောင့်ယှက်သည်၊ တားဆီးသည်။

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

Gas exchange in lungs

 

Anatomical position

 practice Problems

1. In the human body, which of the following body parts are in a superior position to the lungs? (Select all that apply.)

A. Stomach

1. Spleen
2. Heart
3. Brain

1. In two to three sentences, describe the part of the arm that is most distal to the shoulder of the human body.
2. Which terms add clarity to anatomical position relative to the coronal plane?

1. "Superior" and "inferior"
2. "Distal" and "proximal"
3. "Anterior" and "posterior"
4. "Lateral" and "medial"

4. Which two terms are likely to appear in the same discussion related to a part of the body?

1. "Dorsal" and "lumbar"
2. "Umbilical" and "crural"
3. "Dorsal" and "orbital"
4. "Lumbar" and "patellar"

5. Which of the statements below is/are accurate? (Select all that apply.)

1. The axillary region is superior to the cephalic region.
2. The oral, nasal, buccal, and ocular regions are all anterior to the occipital region
3. Digital or phalangeal structures may be pedal or manual.
4. The axillary, brachial, antecubital, antebrachial, popliteal, and sural subregions are all associated with the upper limbs.