Normal vital capacity of lungs is-
**Core Concept**
The vital capacity of the lungs refers to the maximum amount of air a person can expel from their lungs after a maximum inhalation. It is a **pulmonary function test** that measures the lung's ability to expand and is an important indicator of respiratory health.
**Why the Correct Answer is Right**
The normal vital capacity of lungs is approximately 4.6 liters for an average adult male and 3.6 liters for an average adult female, but among the given options, only one is close to this range. The correct answer should reflect the average vital capacity for a healthy adult.
**Why Each Wrong Option is Incorrect**
**Option A:** This value is too low to be considered a normal vital capacity.
**Option B:** Similarly, this is not within the expected range for a healthy adult's vital capacity.
**Option D:** This option is also incorrect as it does not align with the known average vital capacity.
**Why Each Wrong Option is Incorrect (Continued)**
Given the context, the most plausible answer choice should be around 4-5 liters for an average male, considering the options provided.
**Clinical Pearl / High-Yield Fact**
Remember, **vital capacity** is the sum of **tidal volume**, **inspiratory reserve volume**, and **expiratory reserve volume**. It's a key concept in understanding lung function and can be affected by various respiratory and non-respiratory conditions.
**Correct Answer:** Correct Answer: C. 4.6 liters