The Circulatory System

Why is the heart called a double pump system?
Arteries take oxygenated blood away from heart while veins take deoxygenated blood to the heart.
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What is the rule that the pulmonary artery & vein break?
They carry the opposite type of blood than arteries and veins.
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How is the heart made to pump?
By little pulses of electricity from the wall of the right atrium.
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Give 4 facts about arteries.
They carry blood away from the heart, they have thick muscular walls to withstand pressure, they have small passageways for blood called lumen and have high pressure.
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Give 5 facts about veins.
They carry blood to the heart, have thin walls, large lumen, low pressure and have valves to prevent backflow of blood.
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Give 4 facts about capillaries.
They are found in muscles and lungs, 1 cell thick, have very low blood pressure and is the gas exchange location.
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Describe the role of capillaries in gas exchange.
Oxygen passes through the capillary wall and into the tissues, carbon dioxide passes from the tissues into the blood.
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Describe the 3 stages how the heart pumps.
1. Blood flows into the two atria 2. Atria gently push blood into the ventricles 3. Ventricle contracts pushing blood around the aorta & pulmonary artery. The valves stop backflow.
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Why does the left side of the heart have a thick muscular wall?
It needs to pump blood around the whole body.
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What is the bicuspid valve?
Valve between left atrium and left ventricle.
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What is the tricuspid valve?
Valve between right atrium and right ventricle.
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What are the heart tendons/heart strings?
Attached to valves to stop them flipping inside out.
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What is the septum?
Muscular wall between right and left of heart.
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What are semi lunar valves?
Valves between right ventricle and the pulmonary artery.
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What is haemoglobin?
Found in red blood cells which carries oxygen.
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Where are red blood cells made?
In the bone marrow.
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Why do red blood cells have no nucleus?
To allow more space for oxygen.
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Describe the biconcave disc shape.
Gives red blood cell greater surface area and allows cell to move through small spaces.
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What is the role of white blood cells?
To protect the body by fighting disease.
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What is plasma and what does it carry?
It is the fluid part of the body and carries carbon dioxide, hormones and waste.
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What is the role of platelets?
They protect the body by stopping bleeding. They clump together to form clots.
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Other cards in this set

Card 2

Front

What is the rule that the pulmonary artery & vein break?

Back

They carry the opposite type of blood than arteries and veins.

Card 3

Front

How is the heart made to pump?

Back

Preview of the front of card 3

Card 4

Front

Give 4 facts about arteries.

Back

Preview of the front of card 4

Card 5

Front

Give 5 facts about veins.

Back

Preview of the front of card 5
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