Question

Select the correct letters associated with inspiration and place them in the correct order: A. air flows into lungs B. air flows out of lungs C. decrease in pressure D. decrease in volume E. elastic recoil of lungs F. increase in pressure G. increase in volume H. muscle contraction I. muscle relaxation

Answer 1

The correct sequence for inspiration is H (muscle contraction), G (increase in volume), C (decrease in pressure), followed by A (air flows into lungs). This represents the steps that allow the lungs to draw air in during inspiration.

Step-by-step explanation:

To answer the question regarding the correct letters associated with inspiration and their correct order, one has to understand the process itself. Inspiration, or inhalation, is the act of drawing air into the lungs.

Correct Order of Events for Inspiration:

H. Muscle Contraction - The diaphragm and external intercostal muscles contract.

G. Increase in Volume - This muscle contraction increases the volume of the thoracic cavity.

C. Decrease in Pressure - As volume increases, pressure within the lungs decreases.

A. Air Flows into Lungs - The lower pressure inside the lungs compared to the outside atmosphere causes air to flow into the lungs.

These steps correlate with the process of breathing, where the diaphragm and intercostal muscles work in tandem to allow air to flow into the lungs during inspiration.