The Circulatory System - B3e

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  • Created by: iram_f
  • Created on: 12-01-15 19:15
What happens in a heart beat? (Part 1)
Deoxygenated blood enters the vena cava & right atrium; it passes through the right ventricle so the tricuspid valve closes & the semilunar valve opens. Through the pulmonary artery the blood goes to the lung.
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What happens in a heart beat? (Part 2)
The re-oxygenated blood enters the pulmonary vein & left atrium before passing into the left ventricle, so the bicuspid valve closes & the semilunar valve opens to allow the blood to exit through the aorta.
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What is the advantage of having a double circulatory system?
In a double circulatory system blood flows at a higher pressure, which allows the blood to flow to cells quicker, increasing the blood flow rate.
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How are arteries and veins adapted to carry blood?
Arteries have a thick, muscular, elastic wall to withstand high blood pressures when transporting blood across the body whilst veins have a large lumen, for low blood pressure, and valves to prevent backflow.
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What is the composition of blood?
Blood consists of plasma, to transport dissolved substances, platelets (which clot at a wound), white blood cells, to protect the body against disease and red blood cells that transport oxygen.
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What are the specific adaptations of red blood cells?
They have no nucleus, leaving more space for haemoglobin that reacts with O2 to produce oxyhaemoglobin (this separates at tissues into O2 & haemoglobin). They have a small, biconcave shape giving them a large surface area.
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What are capillaries?
Capillaries join arteries to veins, so materials, such as oxygen, are exchanged between capillaries and the body tissues - they have a thin, permeable wall to allow this exchange.
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Other cards in this set

Card 2

Front

What happens in a heart beat? (Part 2)

Back

The re-oxygenated blood enters the pulmonary vein & left atrium before passing into the left ventricle, so the bicuspid valve closes & the semilunar valve opens to allow the blood to exit through the aorta.

Card 3

Front

What is the advantage of having a double circulatory system?

Back

Preview of the front of card 3

Card 4

Front

How are arteries and veins adapted to carry blood?

Back

Preview of the front of card 4

Card 5

Front

What is the composition of blood?

Back

Preview of the front of card 5
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