Chapter 34.2, Problem 5MI

Summary Introduction

To Determine:

The structure that helps in filtering the blood coming to lungs.

Introduction:

Breathing: It is the process of movement of air in and out of the lungs. In this process, the carbon dioxide rich air from the lungs are expelled into the external environment and fresh air is inhaled.

Explanation of Solution

Three structures that filters the air through the nasal passage.

1. Hair: the nasal passage way starts from the nose, where the entrance is covered by a network of fine air. This network act as a mechanical filter for avoiding the entrance for bigger dust particles.
2. Cilia and turbulence: the sir coming in through the passage encounter a series of cilia which create a turbulence in the air. This causes the heating of the air coming and might kill some pathogen due to the heat.
3. Mucus: The heavy particles and the microbes are trapped by the mucosal lining of the lungs, so that the cannot harm by entering the blood vessels.