Circulatory System Flashcards

(21 cards)

1
Q

What is blood composed of?

A

Red blood cells, white blood cells, plasma and platelets.

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2
Q

What is the function of red blood cells?

A

Red blood cells transport oxygen to the muscles from the lungs.

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3
Q

How are red blood cells adapted for their function?

A

They have a biconcave disc shape which increases their surface area : volume; they contain haemoglobin which binds easily to oxygen; they don’t have a nucleus which increases their capacity to carry oxygen.

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4
Q

What are white blood cells used for?

A

They form part of the immune system and attack foreign microbes such as pathogens which can be harmful.

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5
Q

What are platelets?

A

They are small fragments of cells which encourage blood to clot at the sites of wounds.

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6
Q

What is the function of the plasma?

A

It transports dissolved food molecules, carbon dioxide and urea around the body, and it has blood cells suspended in it.

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7
Q

What is an artery like?

A

It has a thick wall of muscle and elastic fibres; it also has a small lumen; arteries carry blood away from the heart to the organs of the body.

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8
Q

What is a vein like?

A

It has thin walls and often contains valves to prevent the back flow of blood; it has a large lumen; veins carry blood towards the heart which is usually deoxygenated.

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9
Q

What is a capillary like?

A

Very thin walls for a short diffusion distance; relatively large lumen; capillaries link the arteries and veins.

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10
Q

How can capillaries become narrower?

A

By fatty deposits building up on the walls of the capillaries.

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11
Q

How do doctors solve narrowed blood vessels?

A

A mesh stent and balloon is placed in the blood vessel; the balloon is inflated and the mesh stent holds the vessel open and blood will flow freely.

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12
Q

What supplies the heart with oxygen?

A

The coronary arteries.

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13
Q

What substances does the circulatory system transport?

A

Oxygen, glucose and carbon dioxide.

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14
Q

What is special about the human circulatory system?

A

It is a double circulation, bringing deoxygenated blood to the heart to be pumped to the lungs and oxygenated blood to be pumped around the body.

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15
Q

What are the advantages / disadvantages of using mechanical replacement valves?

A

They last for a very long time; you have to always take medicine to stop blood from clotting; mechanical valves are made from polymers or titanium.

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16
Q

What are the advantages / disadvantages of using replacement biological valves?

A

They work very well and the patient doesn’t need any medication; they only last for around 15 years; biological valves are based on valves taken from pigs or cattle.

17
Q

What are perfluorocarbons (PFCs)?

A

They are a form of artificial blood; they are non-reactive chemicals that can carry dissolved gases around the body.

18
Q

What are the advantages / disadvantages of PFCs?

A

They do not contain cells so can carry oxygen into swollen tissues of a damaged body; they work for a long time and don’t carry disease; they don’t dissolve in water so it’s difficult to get them into the blood; they can cause severe side effects.

19
Q

What are the advantages/ disadvantages of blood transfusions?

A

They can replace blood lost to extend your life; the donor and patient must match blood group; there’s often a shortage of blood donors; blood can only be stored for a limited time.

20
Q

What are the advantages/ disadvantages of haemoglobin-based artificial blood?

A

The haemoglobin used carries more oxygen than normal blood; it doesn’t need to be refrigerated always; it is broken down very quickly; it doesn’t clot or fight disease and has caused severe problems.

21
Q

What are the advantages/ disadvantages of artificial hearts?

A

There’s no wait for a tissue match or wait for a donor; there’s no need to use immunosuppressant drugs; there may be problems with blood clotting; it’s expensive; involves machinery or usually staying in hospital.