the respiratory system functions of the respiratory system: -brings oxygen into the body and into...

The Respiratory System

Functions of the respiratory system:

-Brings oxygen into the body and into the bloodstream-Removes carbon dioxide and water from the bloodstream and out of the body

O2-needed for cellular respiration CO2/H2O-waste from cellular respiration

HINT:

The main function of the respiratory system

is therefore:

GAS EXCHANGE!!!

(for and from cellular respiration!)

The Respiratory System

Where does the waste Carbon Dioxide and Water come from?

-Your body uses oxygen and digested food (glucose) during cellular respiration and converts it to cell energy (ATP). Waste products of cellular respiration include carbon dioxide, which is a poison to your body, and excess water. You must get rid of it! – this is the job of your respiratory system

MouthNasal passage

Trachea

Bronchioles

Alveoli (air sacs at end of bronchioles)

Diaphragm

Lung

Bronchi

Organs of the Respiratory System

The Respiratory System

THE NOSE

- Has hair (cilia) and mucus to filter out dirt/dust and warms and moistens the air

- When you swallow the mucus, it goes into your stomach (digestive system) where you can digest and break down the dirt/dust/bacteria

- Air is inhaled and exhaled through nostrils

The Respiratory System

THE PHARYNX- AKA the throat- Shared with food passage

- Epiglottis – flap; covers the top of the larynx and trachea, prevents food from entering trachea when you swallow

(food goes to esophagus/air goes to trachea)

The Respiratory System

AKA the voice box

Contains the vocal cords that vibrate when air passes along them to allow for sound. When the vibrations are modified by the tongue, palate, and lips, speech can be accomplished.

Made primarily of muscles and cartilage

THE LARYNX

Side View of Upper RespiratorySystem

The Respiratory System

THE TRACHEA

- Tube with cartilage rings- prevent the tube from collapsing (so it’s always open to breathe)

- AKA the windpipe

- Has cilia and mucus, which sweep dirt/dust/bacteria UP to the pharynx so they can be swallowed into the stomach

The Respiratory System

THE BRONCHI

- The trachea branches into 2 bronchi. One goes into each lung.

- The bronchi are the beginning of the lungs

The Respiratory System

THE LUNGS- Inside the lungs, the bronchi divide into smaller and smaller tubes called bronchioles

- At the ends of the bronchioles are alveoli, small air sacs where gases are exchanged. - This is where the circulatory system and the respiratory system meet.

- The lungs are spongy because they are composed of thousands of these microscopic air sacs (alveoli)

The Respiratory System

How does gas exchange occur?-Process of Diffusion!!!

Oxygen diffuses from the alveoli into the capillaries

Carbon Dioxide and Water diffuse out of the capillaries into the alveoliGas exchange animation

Gas exchange animation #2

Where does gas exchange occur?- The ALVEOLI !!!! (they are surrounded by capillaries)

The Respiratory System

How does air get into and out of your lungs?

YOUR DIAPHRAGM!

(a muscle)

Which causes changes in air pressure

diaphragm animation

3-D diaphragm animation

The main function of the respiratory system

is:

GAS EXCHANGE!!!

(for and from cellular respiration!)