Life Science- Respiratory System Flashcards Preview

Grade 9 November Exams > Life Science- Respiratory System > Flashcards

Flashcards in Life Science- Respiratory System Deck (11):


Gases in lungs.
Oxygen is transported by the blood to the body parts where it is needed for respiration.
Your cells produce carbon dioxide during respiration, which is carried to the lungs to be oxygenated.


When you

Breathe in, you take in oxygen into your body. When you breathe out, carbon dioxide come out of your body.



Air passes through the nose or mouth. Tiny hairs and mucus in the nose trap dust particles in the air to prevent them entering the lungs. Small veins warm the air



Air flows down the trachea from the nose into the lungs. Reinforced by rings of cartilage with hairs to move dust and other particles back out of the airways. Divides into two large tubes called bronchi that go into the lungs



Spongy organs that inside a cavity in your chest. Many of millions of tiny air scans called alveoli that are used to exchange gases.



Singular bronchus. One bronchus goes from the trachea to each lung. Also produce mucus to trap dust particles. Inside the lungs, bronchi divide into many smaller branches called bronchioles. 2 bronchi



Singular alveolus. Tiny air-filled sacs that are surrounded by small blood vessels called capillaries. Walls are very thin so gases can cross between capillaries and air sacs. Many alveoli and they provide a large surface area for gaseous exchange.



Physical movement of air in and out of lungs. Muscles around the ribcage and diaphragm control the movement of air into and out of the lungs. Respiratory center in brain controls breathing process.


Gaseous exchange in lungs of

Air in the atmosphere has a higher concentration of oxygen than air in the lungs and blood.
Oxygen is inhaled into the alveoli and then diffuses into the blood in the surrounding capillaries; blood becomes oxygenated.
There is a higher concentration of carbon dioxide in the blood.
Carbon dioxide diffuses into the alveoli from the blood.


Gaseous exchange in cells

Between blood and cells.
All cells have a network of blood capillaries between them. When oxygenated blood arrives at the cells, there is a higher concentration of oxygen in the blood.
Cells have a lower concentration since they use up oxygen for respiration.
Oxygen diffuses from the blood into the cells from a higher concentration to a lower concentration.
During respiration, carbon dioxide is produced which results in a higher of concentration of carbon dioxide in the cells than in the blood.
Carbon dioxide diffuses from the cells into capillaries.
Carbon dioxide is then transported to the lungs.



Oxygen is combined with glucose during respiration, which releases energy from various processes.
Carbon dioxide and water are waste products.
Blood carries food and oxygen to cells and removes carbon dioxide from them.
Carbon dioxide is carried to the lungs which get rid of it.

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