(Round off to the nearest integer)
Understanding Lung Volumes Calculation
This question requires calculating the Expiratory Reserve Volume (ERV) using the provided lung volumes: Vital Capacity (VC), Tidal Volume (TV), and Inspiratory Reserve Volume (IRV).
Lung Volume Formula
The relationship between these lung volumes is defined by the following formula:
$ VC = TV + IRV + ERV $
Where:
- VC = Vital Capacity
- TV = Tidal Volume
- IRV = Inspiratory Reserve Volume
- ERV = Expiratory Reserve Volume
Calculating Expiratory Reserve Volume (ERV)
To find the ERV, we can rearrange the formula:
$ ERV = VC - TV - IRV $
Step 1: Substitute Given Values
Substitute the provided values into the rearranged formula:
Given:
- VC = 4600 mL
- TV = 500 mL
- IRV = 2500 mL
Calculation:
$ ERV = 4600 \text{ mL} - 500 \text{ mL} - 2500 \text{ mL} $
Step 2: Perform Calculation
First, sum the TV and IRV:
$ 500 \text{ mL} + 2500 \text{ mL} = 3000 \text{ mL} $
Next, subtract this sum from the VC:
$ ERV = 4600 \text{ mL} - 3000 \text{ mL} $
$ ERV = 1600 \text{ mL} $
Step 3: Final Answer
The calculated Expiratory Reserve Volume (ERV) is 1600 mL. This value falls within the range specified.
Important Questions from Respiratory System
- The volume percentage of oxygen in inspired air is $20 \%$ and that of expired air is $16 \%$. A person is breathing at a rate of $12$ breaths per minute. Each breath is $500 \text{ ml}$ in volume. The cardiac output is $5 \text{ liters}$ per minute.
Assuming ideal, healthy lung and cardiac conditions, what is the change in percentage of oxygen in blood over $1$ minute? (Round off the answer to one decimal place.) - Which of the following relations is/are CORRECT in terms of various lung volume measurements?
- Which one of the following epithelial cell types is primarily located in the tracheal mucosa of a healthy adult human?
