2.5 Structure & Function of Arteries, Capillaries & Veins Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

How does blood circulate?

A

Blood circulates from the heart through the arteries to the capillaries then to
the veins and back to the heart.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Blood Pressure

A

There is a decrease in blood pressure as blood moves away from the heart.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

The endothelium lining the central lumen of blood vessels…

A

is surrounded by layers of tissue (in arteries and veins).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Structure of an Artery

A

Arteries have an outer layer of connective tissue containing elastic fibres and a middle layer containing smooth muscle with more elastic fibres.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Elastic Walls of the Arteries

A

Stretch and recoil to accommodate the surge of blood after each contraction of the heart.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Control of Blood Flow

A

To control blood flow, the smooth muscle surrounding arteries can contract
causing vasoconstriction (narrowing of blood vessels to slow or block blood flow) or relax causing vasodilation (widening of blood vessels to allow more blood flow and lowering blood pressure).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Capillaries

A

Allow exchange of substances with tissues through their thin walls.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Structure of Veins

A

Veins have an outer layer of connective tissue containing elastic fibres but a
much thinner muscular wall than arteries. They contain valves to prevent the backflow of blood.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Tissue Fluid

A

The fluid between your capillaries and your cells. It supplies cells with glucose, oxygen and other substances. Carbon dioxide and other metabolic wastes
diffuse out of the cells and into the tissue fluid to be excreted.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

At the Artery End

A

Pressure filtration causes plasma to pass through capillary walls into the tissue fluid surrounding the cells.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

At the Vein End

A

Most of the tissue fluid returns to the blood.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Tissue Fluid not Returned to Blood

A

Tissue fluid which does not return to the blood is absorbed by lymphatic vessels and returned as lymph to the circulatory system.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Tissue Fluid and Blood Plasma

A

Tissue fluid and blood plasma are similar in composition, with the exception of
plasma proteins, which are too large to be filtered through the capillary walls.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly