Pathway Of Air And Gaseous Exchange Flashcards
Pathway of air > its flow diagram
Mouth/nose Trachea Left and right lungs Bronchi/bronchioles Alveoli / capillaries Lungs
What happens to oxygen in the first step of gaseous exchange
It’s breathed in and passes through the alveoli into the red blood cells in the capillaries
What happens in the capillaries in stage 2 of gaseous exchange
The oxygen mixes with haemoglobin (protein) which then forms oxyhemoglobin which is carried around the body
What’s happening with haemoglobin at the same time as stages 1&2 in gaseous exchange
Haemoglobin is carrying carbon dioxide from the blood around the body taking it to the capillaries
What happens to c02 in the final stage of gaseous exchange
The co2 from capillaries is passed through the alveoli and is then breathed out
Describe the alveoli in 4 ways and what their job is
It’s 1 cell thick
Has a large surface area for gaseous exchange
Many capillaries run across them for large blood supply
Bring in 02 and take away co2
Definition of capillaries
A network of microscopic blood vessels
They are only 1 cell thick
Definition of diffusion pathway
Distance molecules travelled during diffusion which is short in gaseous exchange
In diffusion in gaseous exchange is the blood in cappilarries surrounding alveoli have high concentration of co2 then??
Explain what then happens to co2
The air in the alveoli has a much lower concentration of carbon dioxide
The co2 therefore diffuses from the blood in capillaries through to the air in alveoli
Why does oxygen diffuse from the air sacs in alveoli to the blood in capillaries
Because there is a high concentration of oxygen in air in alveoli so they diffuse through to the blood in the capillaries hwich have a low concentration of air
