(1ST QUARTER) LESSON 2: RESPIRATORY SYSTEM

It consists of organs involved in breathing. It brings oxygen into our bodies and gets rid of carbon dioxide, which is the waste product of cellular respiration.

• Circulatory system

• Respiratory system

It is lined with hair which filters dust from the air.

• Nose

• Nasal cavity

It is where the dust-filtered air flows. It is lined with cilia and secrets mucus to further filter the air.

• Nose

• Nasal cavity

It is also known as the throat. The common tube or passageway for both food and air

• Larynx

• Pharynx

It is also known as the “voice box”. It contains the epiglottis and vocal cords

• Larynx

• Pharynx

It is also known as the “windpipe”. It is made up of cartilage, which stretches when you shout. It is the widest passageway in the respiratory tract.

• trachea

• bronchi tubes

They are made up of primary and secondary tubes. It carries air between the trachea and lungs.

• trachea

• bronchi tubes

The smallest tubules are connected to the bronchi.

• Bronchioles

• Alveoli

It is also known as “air sacs”. The small units of lungs where the actual exchange of gases takes place.

• Bronchioles

• Alveoli

It is an “active process”. The chest expands and the diaphragm contracts.

• Inhalation

• Exhalation