A Level Biology Practice Exam 2025 - Free A Level Biology Practice Questions and Study Guide

The ventilation rate is calculated by multiplying the tidal volume by the breathing rate. Tidal volume refers to the volume of air inhaled or exhaled during each breath, while the breathing rate is the number of breaths taken per minute.

By multiplying these two values, you determine the total volume of air that is ventilated in a minute, which is essential for understanding respiratory efficiency and gas exchange in organisms. This calculation is significant in various contexts, such as assessing lung function, determining athletic performance, and understanding respiratory health.

Other incorrect choices either misinterpret the relationship between tidal volume and breathing rate or propose a calculation that doesn’t accurately represent the total ventilated air.