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Science 8 > 2. Circulation questions csv > Flashcards

2. Circulation questions csv Flashcards

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1
Q

What is your heart similar to?

A

Your heart is similar to a pump

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2
Q

How hard and long does your heart work?

A

Your heart beats 70 times a minute for 80 years pushing 4 litres of blood a minute through your body

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3
Q

How big is your heart?

A

Your heart is about the size of a fist

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4
Q

What is the purpose of the heart?

A

The purpose of the heart is to pump blood through the body

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5
Q

How many chambers does the heart have?

A

The heart has four chambers

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6
Q

What are the names of the pairs of chambers?

A

There are two atria and two ventricles

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7
Q

What do atria do?

A

Atria allow the blood to move from the body to the heart

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8
Q

What do the ventricles do?

A

The ventricles pump the blood out of the heart

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9
Q

Why does it seem that a picture of the heart is mislabled?

A

The picture has the right atrium and right ventricle on the left side, because it is labeled like it sits in your body.

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10
Q

Why is the left ventricle muscle bigger than the right ventricle?

A

The left ventricle is bigger because it pumps blood to your whole body, but the right ventricle just pumps blood to your lungs.

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11
Q

What is between each chamber?

A

Valves are between each chamber

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12
Q

What is the ‘thub-thub’ sound you hear through a stethoscope?

A

The sound is the opening and closing of the valves

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13
Q

What system is the heart a part of?

A

The heart is part of the circulatory system?

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14
Q

What is the circulatory system like?

A

The circulatory system is like a highway that moves blood around the body

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15
Q

What are the roads in the circulatory system?

A

Blood vessels are the circulatory system.

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16
Q

If your blood vessles were lined up end to end, how long would they be?

A

Blood vessels would be 100 000 km in length

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17
Q

What are the three types of blood vessels?

A

the three types of blood vessels are arteries, capillaries, and veins

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18
Q

What are arteries?

A

Arteries are blood vessels that carry blood away from your heart

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19
Q

What does oxygenated blood mean?

A

Oxygenated blood means blood that is full of oxygen

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20
Q

What keeps blood flowing in one direction?

A

Blood is under pressure as it comes out of the heart, which keeps it flowing in one direction

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21
Q

How can arteries withstand the pressure of blood?

A

Arteries are thick-walled and elastic which makes them strong

22
Q

What is the largest artery in the body?

A

The aorta is the largest artery in the body.

23
Q

How wide is the aorta?

A

The aorta is about the width of a penny 25 mm

24
Q

What happens to the blood vessles the further away from the heart they are?

A

The blood vessels get smaller and smaller as they are further away from the heart.

25
Q

What are the smallest arteries called?

A

The smallest arteries are called arterioles

26
Q

What are capillaries?

A

Capillaries are tiny blood vessels that act like highway interchanges

27
Q

What happens in capillaries?

A

oxygen, nutrients and glucose diffuse through the very thin walls of capillaries into the fluid that surrounds tissue cells. Carbon dioxide goes into the capillaries in exchange

28
Q

What is no longer in blood once it leaves the capillaries?

A

Oxygen is gone from the blood once it leaves capillaries

29
Q

What are the smallest veins?

A

The smallest veins are called venules

30
Q

What two vessels empty into the heart?

A

The superior vena cava and the inferior vena cava empty into the heart

31
Q

How is de-oxygenated blood different than oxygenated blood?

A

De-oxygenated blood is thicker and darker. Pictures show it as blue

32
Q

Where does blood become oxygenated again?

A

In your lungs, blood picks up oxygen again.

33
Q

What is the purpose of valves in the veins?

A

Valves are in veins because there is no longer the pressure from the heart, so to stop blood flowing back to your feet, veins have valves to stop backflow

34
Q

Why are vein walls thinner than artery walls?

A

Veins are thinner because the blood is no longer under pressure

35
Q

What is unusual about the pulmonary vein?

A

The pulmonary vein is the only vein in the body that carries oxygenated blood

36
Q

What is unusual about the pulmonary artery?

A

The pulmonary artery is the only artery in the body to carry de-oxygenated blood

37
Q

What is the function of blood?

A

Blood transports oxygen, nutrients and water to cells. It carries carbon dioxide and waste away from your cells

38
Q

What does blood contain?

A

Blood contains special cells to help fight infection and heal wounds.

39
Q

55% of blood is what?

A

55% of blood is plasma

40
Q

What is plasma

A

Plasma is a clear, yellowish fluid that contains proteins, minerals and other substances

41
Q

What makes up the other 45% of blood

A

45% of blood is made up of red blood cells, white blood cells and platelets

42
Q

How fast are red blood cells made?

A

2 million red blood cells are made every second

43
Q

What do red blood cells do?

A

Red blood cells carry oxygen from your lungs to your cells, and carry carbon-dioxide away from cells to your lungs to be exhaled

44
Q

Where are red blood cells made?

A

Red blood cells are made in bone marrow, and some in the liver and spleen

45
Q

Where is bone marrow?

A

Bone marrow is in bone, such as inside your thigh bone.

46
Q

What is inside red blood cells?

A

Red blood cells have protein molecules of hemoglobin which is what carries the oxygen and carbon dioxide

47
Q

What do white blood cells do?

A

White blood cells fight inction and prevent the growth of cancer

48
Q

What happens when you have an infection?

A

When you have an infection, your blood has more white blood cells

49
Q

What size are white blood cells?

A

White blood cells are much bigger than red blood cells.

50
Q

What are platelets?

A

Platelets are important for clotting blood.

51
Q

What do platelets do?

A

Platelets sell the wound/cut by thickening the blood so a scab can form over a cut

52
Q

How many platelets do you have?

A

There are 200 000-400 000 platelets in a drop of blood

Science 8 (34 decks)

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