Understanding the Human Respiratory System

What is the main organ of the respiratory system?

• Liver

• Kidneys

• Heart

• Lungs

Name the tube that carries air to the lungs.

• esophagus

• trachea

• alveoli

• bronchi

What is the function of the diaphragm in breathing?

• The diaphragm regulates blood flow in the body.

• The diaphragm filters air before it enters the lungs.

• The diaphragm helps in the process of breathing by contracting to allow air into the lungs and relaxing to expel air.

• The diaphragm produces sound during speech.

Which part of the respiratory system is responsible for gas exchange?

• Alveoli

• Trachea

• Lungs

• Bronchi

What are the tiny air sacs in the lungs called?

• Alveoli

• Pleura

• Alveolar ducts

• Bronchi

How does oxygen enter the bloodstream?

• Oxygen enters the bloodstream via the stomach.

• Oxygen enters the bloodstream through the alveoli in the lungs.

• Oxygen is absorbed through the skin.

• Oxygen is transported by red blood cells from the liver.

What happens to the diaphragm when we inhale?

• The diaphragm relaxes and moves upward.

• The diaphragm expands and moves upward.

• The diaphragm contracts and moves downward.

• The diaphragm remains unchanged during inhalation.

Name one common respiratory disease.

• Arthritis

• Asthma

• Hypertension

• Diabetes

Why is it important to breathe through the nose rather than the mouth?

• It is important to breathe through the nose because it filters and warms the air, promotes better oxygen exchange, and supports overall respiratory health.

• Mouth breathing helps in cooling the body more effectively.

• Nasal breathing is only beneficial during exercise.

• Breathing through the mouth increases lung capacity.