Preliminary PDHPECore 2Preliminary PDHPECore 2

The Body in MotionThe Respiratory System

The Respiratory SystemThe Respiratory System

1. Functions of the Respiratory System To enrich the blood and supply the cells and

subsequently the body with oxygen for cellular respiration.

To remove toxic carbon dioxide, produced by cellular respiration, from the blood and body.

Structure of the respiratory SystemStructure of the respiratory System Lungs - Large paired organs in Lungs - Large paired organs in

the thoracic cavity.the thoracic cavity. Bronchi – Tubes branching from Bronchi – Tubes branching from

the trachea which carry air to the trachea which carry air to and from the lungs. They and from the lungs. They continue to branch into smaller continue to branch into smaller secondary and tertiary bronchi secondary and tertiary bronchi and finally into bronchioles. This and finally into bronchioles. This network is often referred to as network is often referred to as the bronchial tree. the bronchial tree.

Alveoli – Tiny sacs in the lungs Alveoli – Tiny sacs in the lungs that are the site of gaseous that are the site of gaseous exchange.exchange. http://www.smm.org/

heart/lungs/top.html

Structure of the Respiratory SystemStructure of the Respiratory System Alveoli – Tiny sacs in the lungs that are the site of Alveoli – Tiny sacs in the lungs that are the site of

gaseous exchange.gaseous exchange.

Respiratory FunctionRespiratory Function

.Respiration involves the following processes;

Pulmonary ventilation – movement of air into the alveoli.

Pulminary diffusion – exchange of gases in the bloodTransportation of Gases - movement of gases in the blood to the cellsInternal respiration – exchange of gases from the blood to the cells

Respiratory FunctionRespiratory Function

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