Topic 2 Repiration Flashcards
What is respiration
Respiration is a chemical reaction that happens in every cell.
What is the word equation for respiration
Glucose+oxygen=carbon dioxide+water+energy
What are three systems involved in respiration
Respiratory
Circulatory
Digestive
When do plants respire and photosynthesise
Plants respire day+night
Plants photosynthesise day only
What happens in the limewater test for carbon dioxide
Limewater turns from colourless to cloudy in the presence of carbon dioxide
What happens during inhalation
. The diaphragm contracts and flattens
. The intercostal muscles contract, pulling the rib cage up and out
. The volume inside the chest cavity increases
. This cause the air pressure in the chest and lungs to decrease
. The air pressure in the lungs is now less that’s the atmospheric pressure
What happens during exhalation
. The diaphragm relaxes and domes up
. The intercostal muscles relax and the rib cage moves up and in
. The volume in the chest cavity decreases
. This cause the air pressure in the chest and lungs to increase
. The air pressure in the lungs is now higher than the atmospheric pressure
What is gas exchange in our lungs
It’s the diffusion of oxygen from the alveoli to the blood and the diffusion of carbon dioxide from the blood to the alveoli.
How can you prove that air changes into carbon dioxide in our lungs
We can blow into a test tube of limewater and it will turn from colourless to milky.
How can we prove that air changes into water vapour in our lungs.
We could breathe into a humidity sensor and the amount of humidity would rise.
How can we prove that air changes in our lungs using temperature
Breathe on a thermometer and the temperature will rise.
What are features of the alveoli
Large surface area
Moist thin walls
Surrounded by blood capillaries
What is diffusion
A key mechanism to allow gas exchange
Causes of asthma
. Bronchial tubes become swollen or inflamed
. Allergies to dust or chemicals
How can asthma be controlled
. Using an inhaler
. Avoiding triggers
