Even the tiny hairs in the human nose are important in breathing. These hairs catch dirt and other particles in the air which enters the nose. The air is also warmed as it passes through the nose. Here is a way to find out how much air your lungs can hold. Fill a large glass bottle or plastic container with water.
Half fill a sink or large basin with water.
Put the container of water in the sink. Put your hand over the top of the container and turn it over. Put a plastic tube into the opening in the container, with one end of the tube well above the water in the sink. Hold the container in place upside down. Take a deep breath.