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Biology: Module 3 > Blood Vessels > Flashcards

Blood Vessels Flashcards

1
Q

Where do Arteries carry blood?

A

Away from the heart

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2
Q

Where do Veins carry blood?

A

Towards the heart

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3
Q

Lumen size of arteries

A

narrow

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4
Q

What is the function of the endothelium in arteries?

A

Reduces friction

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5
Q

What is the function of smooth muscle in arteries?

A

Strength and allows vasoconstriction and vasodilation

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6
Q

Function of the elastic tissue

A

stretches and recoils so provides flexibility

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7
Q

Size of smooth muscle in arteries

A

Thick

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8
Q

What do arterioles do?

A

Carry blood from the arteries to capillaries

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9
Q

How do arterioles compare to arteries?

A

Thinner muscle layer
Elastic layer thinner

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10
Q

What do veins do?

A

Carry blood to the heart

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11
Q

What type of valve do veins have

A

semi lunar

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12
Q

Why do veins have valves

A

to prevent backflow

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13
Q

Size of lumen in veins

A

Wide

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14
Q

Why is there a large lumen in veins?

A

Volume of blood is large

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15
Q

How does the structure of veins compare to arteries?

A

Smooth muscle and elastic layer are thinner

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16
Q

Why are the smooth muscle and elastic layer thinner in veins compared to arteries

A

Blood is at a lower pressure

17
Q

What do venules do?

A

Carry blood from capillaries to veins

18
Q

What do capillaries do?

A

Deliver blood to cells

19
Q

What is the structure of the wall of capillaries

A

single layer of endothelial cells

20
Q

How do substances leave the capillaries?

A

Pores

21
Q

How are capillaries efficient for diffusion

A

Highly branched so have a large surface area

22
Q

The largest artery

A

Aorta

23
Q

Why does the tough outer layer contain collagen?

A

Strong so withstands pressure

24
Q

Where is smooth muscle the thickest?

A

Arterioles

25
Q

What is vasoconstriction?

A

Vessel contracts and gets narrower

26
Q

What is vasodilation?

A

Vessel relaxes and gets wider

27
Q

What order are the layers in vessels (outside to inside)

A

tough outer layer, muscle layer, elastic layer, lining layer, lumen

28
Q

What does the muscle layer do?

A

Contracts and relaxes so controls blood flow

Biology: Module 3 (18 decks)

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