1The doctor examined her nostril to determine the cause of the nasal congestion.
2When you breathe in, the air enters your body through your nostrils and passes down the trachea.
3She pinched her nostrils shut to avoid smelling the pungent odour.
4The anatomical structure of the nostril is designed to warm and humidify the air we breathe.
5During the examination, the nurse gently inserted a nasal tube through one of the patient's nostrils to administer oxygen.