the heart and circulatory system Flashcards

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

what do arteries do

A

carry blood away from the heart

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

how is blood pumped out of the arteries

A

at high pressures

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

what are muscles in the arteries like

A

thick compared to the lumen, there are layers of muscle in the walls to make them strong

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

what allows the muscles in arteries to stretch and recoil

A

elastic fibres which helps withstand pressure created by pumping of blood

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

what do veins do

A

take blood back to the heart

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

what is blood like in the veins

A

at low pressure

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

what is the structure of the veins like

A

bigger lumen than arteries to help blood flow despite low pressures

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

what do capillaries join up to form

A

veins

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

what do arteries branch out into

A

capillaries

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

how are capillaries adapted to help exchange of substances

A

one cell thick to allow blood to flow really close to every cell in the body

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

why are capillaries narrow

A

to squeeze into gaps between cells

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

why do capillaries have a permeable wall

A

so substances can diffuse in and out

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

What is the role of the right atrium

A

receives deoxygenated blood through the vena cava from the body at LOW PRESSURE

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

where does the blood go after the right atrium

A

right ventricle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

what does the right ventricle do

A

contracts to pump blood to the kings where it is oxygenated

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

where does blood go after the right ventricle

A

left atrium

17
Q

what happens in the left atrium

A

receives oxygenated blood from the lungs through pulmonary vein still at low pressure

18
Q

where does blood flow to after the left atrium

A

left ventricle

19
Q

what happens in the left ventricle

A

oxygenated blood enters the left ventricle which contracts to pump it round the whole body via the aorta

20
Q

why does the left ventricle have a much thicker wall

A

has to pump blood round the whole body at high pressure

21
Q

what provides a strong heartbeat

A

muscular walls

22
Q

what is the role of the septum

A

ensures that deoxygenated and oxygenated blood don’t mix

23
Q

why does the heart have valves

A

stop back flow of blood so blood keeps flowing forward

24
Q

what is cardiac output

A

volume of blood pumped out of the heart in a minute