Yr8 - respiratory system

Dr Pusey

www.puseyscience.com

Respiratory System The respiratory system is made up

of:

Nasal Cavity

Epiglottis

Trachea

Lungs

Bronchi

Bronchioles

Alveoli

Diaphragm

Ribs

Epiglottis

Nasal Cavity Air enters the nasal cavity where it is

warmed and moistened

The hairs inside your nostrils filter large dust particles and the finer hairs called cilia help collect the smaller particles

Epiglottis

The epiglottis is a thin flap of tissue made out of cartilage

The epiglottis is located at the opening of the windpipe.

It prevents the food and liquids from entering the windpipe.

Trachea• The trachea also know as the windpipe, is the pipe that connects your mouth and nasal cavity to your lungs.

• The tracheas walls are thin but reinforced with firm material rings of cartilage (you can feel them if you run your hand down your throat)

• These rings of cartilage keep your trachea from collapsing when you breath in.

Bronchi & Bronchioles The trachea divides into

two bronchi (singular bronchus)

The bronchi are tubes that take air from the trachea to the lungs

The bronchi divide into even smaller tubes called bronchioles

Alveoli Have a very large surface area

Allow gas exchange between the lungs and bloodstream

Oxygen goes into the bloodstream

Carbon dioxide comes out of the bloodstream

Blood then delivers oxygen to cells around your body so respiration can occur

DiaphragmThe diaphragm is a

sheet of muscle that separates the chest from the abdomen

It controls breathing by moving up and down Diaphragm

RibsThe ribs protect the

heart and lungs

They are a part of the skeletal system (all the bones in your body)

Things to Remember! Breathing – pulling air into your lungs, pushing air

back out of your lungs

Gas exchange – happens in the alveoli, oxygen goes in, carbon dioxide comes out

Respiration – chemical process that happens in cells, creates energy

http://www.pearsonplaces.com.au/PORTALS/0/assets/science/uc_s3_l028_p04_a01.mp4

http://www.pearsonplaces.com.au/PORTALS/0/assets/science/uc_s3_l028_p05_a01.mp4