Respiration Quiz (1)

Which of the following structures is primarily responsible for gas exchange in the lungs?

• Bronchi

• Alveoli

• Trachea

• Pleura

What is the primary muscle involved in normal inspiration?

• 
  

• Internal intercostal muscles

  
  

• Diaphragm

• Abdominal muscles

• Sternocleidomastoid

During expiration, the pressure in the lung compared to atmospheric pressure is

• Higher

• Lower

• Equal

• Variable

Which of the following statements about pleural pressure is true?

• It is always equal to atmospheric pressure

• It becomes more negative (sub-atmospheric) during inspiration

• It is positive during expiration

• It remains constant throughout the respiratory cycle

What happens to the alveolar pressure during inhalation?

• It increases above atmospheric pressure.

• It decreases below atmospheric pressure

• It remains constant

• It fluctuates randomly

What is the primary driving force for airflow into the lungs?

• Muscle contraction alone

• The pressure gradient

• Surface tension in alveoli

• Alveolar elasticity

The exchange of gases between the surrounding environment and the lungs is called

• Expiration

• External respiration

• Cellular respiration

• Inspiration

Which of these statements is true about intrinsic (cellular) respiration?

• Production of ATP

• Exchange of gases between the bloodstream and tissue cells

• Exchange of gases between alveoli and the bloodstream

• Breathing between the atmosphere and the alveoli

Mention 2 aims of respiration

Answer explanation

1- Supply Oxygen and remove carbon dioxide

2- Regulate pH

3- Excretion of certain anesthetic drugs

Normal respiratory rate (cycles) in adult is

Answer explanation

12- 16 cycles / min