Flashcards in Topic 8 Deck (20):
What are the alveoli?
An exchange surface found in the lungs.
What is the rate of diffusion dependent on?
Distance, concentration difference, and surface area
Rate of diffusion = surface area x concentration
Thickness of membrane
Why don’t erythrocytes have a nucleus?
It allows them more room to carry oxygen
What does haemoglobin do?
It binds to oxygen and becomes oxyhemoglobin in the lungs. In the body tissue, the reverse happens to release oxygen into the cells.
What is the purpose of platelets?
To help blood clot in a wound.
Where to arteries carry blood?
Away from the heart.
Where do veins carry blood?
Carry blood to the heart.
What do capillaries do?
These are involved in the exchange of materials at the tissues.
Why are capillary walls only one cell thick?
It increases the rate of diffusion.
What happens in the first circuit of the heart?
The heart pumps deoxygenated blood to the lungs to take in oxygen.
What happens in the second circuit of the heart?
The heart pumps oxygenated blood around all the other organs of the body to deliver oxygen.
How does deoxygenated blood enter the heart?
The right atrium receives it through the vena cava.
Where does deoxygenated blood go once it has been received in the heart?
It moves into the right ventricle, which pumps the blood to lungs via the pulmonary artery.
Where does oxygenated blood enter the heart?
Through the left atrium via the pulmonary vein, from the lungs.
Where does the oxygenated blood go after is has entered the left atrium?
It moves to the left ventricle, which pumps it out round the whole body (via the aorta).
Cardiac output equation?
Cardiac output = heart rate x stroke volume
The process of transferring energy from the breakdown of organic compounds.
Aerobic respiration equation?
Glucose + oxygen ——-> carbon dioxide + water