The trachea leads to the:

The space at the back of the mouth, that leads either to the airway or the esophagus is the:

Oxygen from the air enters the blood stream at what location?

On the image shown , which is the part A and part B denoting

On the image shown , mark the option C

Which structures filter and moisten air as it passes through the human respiratory system?

_____ system involves breathing air in and out of the body.

Breathing air into lungs

Breathing air out of lungs

Region of the nose

Are the human lungs completely identical?

What is the job of the Alveoli ?