Share The Respiratory System
Save to Folder
Where does gas exchange occur?
The Alveolus
What features of the alveoli make them suitable for gas exchange?
Thin Walls, Surrounded by capillaries, Numerous
What substance is used to test for the presence of carbon dioxide?
Limewater
What happens to limewater in the presence of Carbon Dioxide
It turns milky/cloudy
Define diffusion
The movement of a substance from an area of high concentration to an area of low concentration.
Outline the steps involved in inhaling.
Intercostal muscles contract- the ribs move up and out. Diaphragm contracts- moves down. Volume the thorax increases. Pressure on lungs decreases. Air sucked in
What are the 5 steps involved in exhaling?
Intercostal muscles relax- ribs move down and in. Diaphragm relaxes and arches up.Volume of thorax decreases.Pressure on lungs increases. Air pushed out
During gas exchange, where does the oxygen pass into?
From the alveolus to the blood
During gas exchange, where does the co2 pass into?
From the blood into the lungs
Where does the oxygenated blood travel after gas exchange?
All around the body
What is the percentage of oxygen in inhaled air?
21%
What is the percentage of CO2 in exhaled air?
4%
What happens to carbon dioxide in the lungs?
It is exhaled.
Outline the role of the diaphragm in breathing.
Inhaling - Contracts and moves down. Exhaling- Relaxes and arches up
What is the equation for respiration?
glucose + oxygen -- energy + carbon dioxide +water.
What is respiration?
Respiration is the release of energy from food in the cell of an organism.
