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biology > Blood Vessels > Flashcards

Blood Vessels Flashcards

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AP® Biology flashcards
1
Q

What type of circulatory system do humans have

A

Closed Circulatory system

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2
Q

Name the five main types of blood vessels

A 
Arteries
Arterioles
Capillaries
Venules
Veins
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3
Q

What is the flow chart of blood through the vessels

A

Heart -> Artery -> Arteriole -> Capillary -> Venule -> Vein -> Heart

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4
Q

What do Arteries do

A

Carry blood AWAY from the heart to other organs

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5
Q

What level of pressure is the blood in arteries

A

High pressure

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6
Q

How do arteries manage high blood pressure

A

The walls of the arteries are very thick and elastic

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7
Q

What is the main artery

A

The aorta

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8
Q

What are arterioles

A

The smallest arteries in the body

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9
Q

What do arterioles do

A

They deliver blood to capillaries

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10
Q

How do arterioles control how much blood enters the capillaries

A

The are capable of constricting or dilating

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11
Q

What are capillaries

A

Very thin tubes that join the arteries with the veins

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12
Q

How thick of capillaries

A

Only 1 cell thick

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13
Q

Why are capillaries important

A

This is where gaseous exchange occurs

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14
Q

What gaseous exchange occurs in the capillaries

A

Oxygen and nutrients diffuse out of the capillaries into the tissue cells

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15
Q

What are Venules

A

Group of capillaries within a tissue that reunite to form a small vein called a venule

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16
Q

What do Venules do

A

Collect blood from capillaries and drain it into veins

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17
Q

What do Veins do

A

Carry blood which contains a large amount of carbon dioxide (deoxygenated) back to your heart

18
Q

Do Veins have thinner or thicker walls than arteries and why is this

A

They have thinner walls than arteries as the blood is not moving at such a high pressure

19
Q

Why do veins have valves

A

Due to the low pressure, veins have valves to stop the blood from flowing away from the heart

20
Q

What are the principal veins

A

The venae cavae

21
Q

What are arteries layer of muscles and elastic fibers described as

A

They have a thick layer of muscles and elastic fibers

22
Q

What are veins layer of muscles and elastic fibers described as

A

They have a thin layer of muscles and elastic fibers

23
Q

Do capillaries have muscles and elastic fibers

A

No

24
Q

Describe Arteries lumen

A

Narrow

25
Q

Describe Veins’ lumen

A

Wide

26
Q

Describe Capillaries lumen

A

Very small

27
Q

How thick is the wall of arteries

A

Thick outer wall

28
Q

How thick is the wall of veins

A

Thin outer wall

29
Q

How thick is the wall of capillaries

A

Only one cell

30
Q

Do arteries have semi lunar valves

A

No

31
Q

Do veins have semi lunar valves

A

Yes

32
Q

Do capillaries have semi lunar valves

A

No

33
Q

Where are arteries found

A

Deep into the body surface

34
Q

Where are veins found

A

Near the body surface

35
Q

Where are capillaries found

A

Inside all tissues

36
Q

Where does blood flow in arteries

A

From the heart to the body

37
Q

Where does blood flow in veins

A

Back to the heart

38
Q

What oxygen concentration is the blood in arteries

A

Oxygenated (except pulmonary artery)

39
Q

What oxygen concentration is the blood in veins

A

Deoxygenated (Except pulmonary veins)

40
Q

What pressure is the blood in arteries

A

High

41
Q

What pressure is the blood in veins

A

Low

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