Respiratory System

2012

Breathing

Is the movement of air into and out of the lungs

Allows your respiratory system to take in oxygen and eliminate carbon dioxide

Taking in Oxygen

Your body needs oxygen for cellular respiration

Eliminating Carbon Dioxide

Respiratory system removes CO2 waste gases from the body

Respiratory Organs

Pharynx

Larynx and trachea

Bronchi and lungs

Alveoli

pharynx

A tubelike passageway at the top of the throat that receives air, food, and liquids from the mouth and nose.

Epiglottis – a flap of tissue at the lower end of the pharynx. It stops food and liquids from entering your lungs.

Larynx and trachea

Larnyx is a triangle-shaped

on which air passes over

also called voice box

THEN………….

Air enters the trachea

Bronchi

Trachea branches into 2 narrow tubes called the bronchi that leads into the lungs

Lungs

Major organs of the respiratory system

Bronchi branch into smaller and narrower tubes called bronchioles

Alveoli

Bronchioles end in microscopic sacs called aveoli

This is where gas exchange occurs

Gas exchange- oxygen from the air you breathe moves into the blood and carbon dioxide from the blood goes into the aveoli

Structure of aveoli

Walls of aveoli are one cell thick

Blood vessels cover the

outside of the aveoli

How do you breathe?

When high levels of CO2 build up in your blood it signals your nervous system to exhale. Then you inhale.

Your diaphragm is a large muscle below your lungs that contracts and relaxes. That’s how the air moves in and out of your lungs. It simply a change in air pressure!

Review of respiratory system