Question

Which of the following is the correct path of oxygen in humans during inhalation?

• A. Nostrils $\to$ Nasal Cavity $\to$ Pharynx $\to$ Trachea $\to$ Bronchi $\to$ Bronchiole $\to$ Alveoli
• B. Nostrils $\to$ Nasal Cavity $\to$ Trachea $\to$ Pharynx $\to$ Bronchi $\to$ Bronchiole $\to$ Alveoli
• C. Nostrils $\to$ Nasal Cavity $\to$ Pharynx $\to$ Trachea $\to$ Alveoli $\to$ Bronchi $\to$ Bronchiole
• D. Nostrils $\to$ Nasal Cavity $\to$ Pharynx $\to$ Bronchi $\to$ Trachea $\to$ Bronchioles $\to$ Alveoli

Answer 1

The correct option is A Nostrils $\to$ Nasal Cavity $\to$ Pharynx $\to$ Trachea $\to$ Bronchi $\to$ Bronchiole $\to$ Alveoli

The correct path of oxygen transfer is nostrils - external structures, nasal passage or the nasal cavity then into the pharynx followed by trachea and bronchii to smaller branches called the bronchioles and lastly the alveoli from where it is exchanged into the blood stream with the help of capillaries surrounding the alveoli.

So, the correct answer is Nostrils →→ Nasal Cavity →→ Pharynx →→ Trachea →→ Bronchi →→ Bronchiole →→ Alveoli