Problem 7 Which of the following is a corr... [FREE SOLUTION]

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Chapter 6: Problem 7

Which of the following is a correct sequence of passageways through which air travels during inhalation? (A) Pharynx \(\rightarrow\) trachea \(\rightarrow\) bronchioles \(\rightarrow\) bronchi \(\rightarrow\) alveoli (B) Pharynx \(\rightarrow\) trachea \(\rightarrow\) larynx \(\rightarrow\) bronchi \(\rightarrow\) alveoli (C) Larynx \(\rightarrow\) pharyn \(x \rightarrow\) trachea \(\rightarrow\) bronchi \(\rightarrow\) alveoli (D) Pharynx \(\rightarrow\) larynx \(\rightarrow\) trachea \(\rightarrow\) bronchi \(\rightarrow\) alveoli

Short Answer

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Option (D)

Step by step solution

- Identify the Starting Point

Understand that air enters the respiratory system through the pharynx.

- Determine the Airflow Sequence

Following the pharynx, air travels to the larynx.

- Next Passageway

From the larynx, air continues to the trachea.

- Division into Bronchi

The trachea then divides into the bronchi.

- Further Division

The bronchi further divide into smaller bronchioles.

- Final Destination

Finally, air reaches the alveoli where gas exchange occurs.

- Validate the Correct Option

Compare all provided sequences to find that the correct airflow sequence is mentioned in option (D).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Inhalation

Inhalation is the process by which humans take in oxygen from the environment. This process begins when the diaphragm contracts and moves downward, creating a vacuum that draws air into the lungs.
During inhalation, air travels through a series of passageways. Understanding this sequence helps us grasp how the respiratory system functions efficiently to provide oxygen to the blood and remove carbon dioxide.

Pharynx

The journey of inhaled air starts at the pharynx, which is situated at the back of the throat. The pharynx acts as a pathway for both air and food, directing air to the lungs and food to the esophagus.
It serves as the first checkpoint where the air is filtered, moistened, and warmed. This conditioning of the air is crucial as it ensures that the delicate tissues in the deeper parts of the respiratory system are protected.

Larynx

After passing through the pharynx, the next stop for the air is the larynx. The larynx, also known as the voice box, is located just below the pharynx.
It plays a dual role - it directs air towards the trachea and houses the vocal cords that allow for speech production. The epiglottis, a flap of tissue within the larynx, prevents food from entering the airway by closing off the larynx during swallowing.

Trachea

From the larynx, air travels down the trachea, which is a tube-like structure lined with cilia and mucus to trap inhaled particles. The trachea, commonly known as the windpipe, serves as a direct pathway to the lungs.
Structurally, it is fortified by cartilaginous rings that maintain its shape and prevent it from collapsing during breathing. This ensures a constant and unobstructed passage of air.

Bronchi

At the end of the trachea, the air passage splits into two main bronchi - left and right - each entering a lung. The bronchi are larger airways that branch off into the lungs.
These bronchi continue to divide into smaller branches, much like the branches of a tree, facilitating the distribution of air throughout the lungs.
Their walls also contain cartilage and are lined with mucus and cilia to continue the cleaning process of the inhaled air.

Bronchioles

The bronchi further divide into even smaller passageways known as bronchioles. Unlike the bronchi, the bronchioles lack cartilage but are lined with smooth muscle which helps regulate airflow.
These tiny branches spread throughout the lungs, reaching every corner to ensure that air is efficiently delivered to the alveoli, the next destination in the airflow pathway.

Alveoli

The final destination for inhaled air is the alveoli. Alveoli are tiny, balloon-like structures clustered at the ends of the bronchioles.
They are the primary site of gas exchange where oxygen from the air passes into the blood, and carbon dioxide from the blood is released into the lungs to be exhaled.
The alveoli have thin walls and are surrounded by a network of capillaries, facilitating efficient gas transfer.
This crucial part of the respiratory system ensures that our body tissues receive the oxygen they need for cellular processes.

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