Respiratory System

Respiratory System

Arnel P. Data

•Why do we breathe? Think of all the reasons why we need a respiratory system.

Words to Remember:

• “Respiration” is used several different ways

• •Cellular respiration is the aerobic breakdown of glucose in the mitochondria to make ATP.

• •Respiratory systems are the organs in animals that exchange gases with the environment.

• •“Respiration” is an everyday term that is often used to mean “breathing.”

Multiple Choice

What is Respiration?

• the action of breathing.

• the action of eating

Respiratory System Functions

•Respiratory systems allow animals/human to move oxygen (needed for cellular respiration) into body tissues and remove carbon dioxide (waste product of cellular respiration) from cells.

What are the parts of the Human Respiratory system

• •Trachea

• •Bronchi

• •Bronchioles

• •Alveoli

How does Respiratory System Work?

• •During inspiration (inhalation), the diaphragm and intercostal muscles contract.•During exhalation, these muscles relax. The diaphragm domes upwards.

The Alveoli

• •The alveoli are moist, thin-walled pockets which are the site of gas exchange.

• •A slightly oily surfactant prevents the alveolar walls from collapsing and sticking together.

The Gas Circulation

• •Recall the interconnection between circulation and the respiratory system.

• •Gas exchange at the lungs and in the body cells moves oxygen into cells and carbon dioxide out.

What happens when you breath in?

• The rib muscles relax.

• The diaphragm contracts.

• Air leaves the alveoli.

• Air moves between the chest wall and the lung.

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