breathing

Breathing

Happens in animals with lungs and gills. Process of oxygen taken into the body while carbon dioxide is released

rib muscles

Contract to move the ribs upwards and outwards. Reduces pressure

Ribs

Helps increase the space inside your chest

trachea / windpipe

Allows air to travel from your mouth

Diaphragm

Contracts and flattens when we breathe in allowing chest to expand pulling in air

Larynx

Your voice box

Bronchus ( bronchi)

The main airways carries air to and from your lungs branching off into smaller passageways

Bronichles

The smallest airways. Lead to tiny air sacs called alveoli

how does air enter the lungs?

Atmosphere - nasal passage - larynx - trachea - bronchus - bronchioles- air sacs

What do trachea and bronchi both have in common

they have rings of cartilage in their structures to make sure they are wide open for oxygen

What does the trachea, bronchi and bronichles have in common

Their cells are covered with cilia, fine hair like structured that brushes down oxygen particles to get to the air sacs quicker.

Airs sacs, alveoli

Your lungs contain millions of these. they are too small to be seen in diagrams

Alveoli more

Alveoli are good at their job because they have a rich blood supply for diffusion. They have a large surface area which makes fast diffusion. They also have thin walls for alveolus

Gaseous exchange

movement of oxygen from the alveoli into the blood stream and the movement of carbon dioxide from the blood stream into the alveoli.

why does gaseous exchange happen

because of the random movements of particles