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THE HEART. LUNGS: Gas exchange. http://www.sumanasinc.com/webcontent/animations/content/human_heart.html. the external surface of the heart is covered with blood vessels – the coronary arteries and veins these provide food and oxygen for the muscle of the heart.

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the heart
THE HEART

LUNGS:

Gas

exchange

http://www.sumanasinc.com/webcontent/animations/content/human_heart.html

slide2

the external surface of the heart is covered with blood vessels – the coronary arteries and veins

these provide food and oxygen for the muscle of the heart

slide5

there are 4 chambers inside the heart

2 atria (singular atrium)

slide6

RA

LA

there are 4 chambers inside the heart

2 atria (singular atrium)

slide7

RA

LA

there are 4 chambers inside the heart

2 atria (singular atrium)

2 ventricles

slide8

RA

LA

RV

LV

there are 4 chambers inside the heart

2 atria (singular atrium)

2 ventricles

slide9

RA

LA

valves

RV

LV

there are also valves that ensure the blood flows in the correct direction

slide10

RA

LA

RV

LV

four blood vessels connect to the chambers of the heart

slide11

pulmonary vein

RA

LA

RV

LV

four blood vessels connect to the chambers of the heart

2 veins carrying blood to the heart

slide12

vena cava

pulmonary vein

RA

LA

RV

LV

four blood vessels connect to the chambers of the heart

2 veins carrying blood to the heart

slide13

vena cava

pulmonary vein

RA

LA

RV

LV

four blood vessels connect to the chambers of the heart

2 veins carrying blood to the heart

2 arteries carrying blood from the heart

slide14

vena cava

aorta

pulmonary vein

RA

LA

RV

LV

four blood vessels connect to the chambers of the heart

2 veins carrying blood to the heart

2 arteries carrying blood from the heart

slide15

vena cava

pulmonary artery

aorta

pulmonary vein

RA

LA

RV

LV

four blood vessels connect to the chambers of the heart

2 veins carrying blood to the heart

2 arteries carrying blood from the heart

slide16

RA

LA

RV

LV

if we just look at the left side of the heart as it beats..

slide18

pulmonary vein

RA

LA

oxygenated blood from the lungs enters the left atrium via the pulmonary vein

RV

LV

slide19

pulmonary vein

RA

LA

oxygenated blood from the lungs enters the left atrium via the pulmonary vein

RV

LV

slide20

pulmonary vein

RA

LA

the left atrium contracts forcing blood through the valve into the left ventricle

RV

LV

slide21

pulmonary vein

RA

LA

the left atrium contracts forcing blood through the valve into the left ventricle

RV

LV

slide22

pulmonary vein

RA

LA

the left atrium contracts forcing blood through the valve into the left ventricle

RV

LV

slide23

pulmonary vein

RA

LA

the left atrium contracts forcing blood through the valve into the left ventricle

RV

LV

slide24

pulmonary vein

RA

LA

the left atrium contracts forcing blood through the valve into the left ventricle

RV

LV

slide25

aorta

pulmonary vein

RA

LA

the left ventricle contracts forcing blood out of the aorta to the body

the valve stops the blood flowing back into the left atrium

RV

LV

slide26

aorta

pulmonary vein

RA

LA

the left ventricle contracts forcing blood out of the aorta to the body

the valve stops the blood flowing back into the left atrium

RV

LV

slide27

aorta

pulmonary vein

RA

LA

the left ventricle contracts forcing blood out of the aorta to the body

the valve stops the blood flowing back into the left atrium

RV

LV

slide28

aorta

pulmonary vein

RA

LA

the left ventricle contracts forcing blood out of the aorta to the body

the valve stops the blood flowing back into the left atrium

RV

LV

slide29

aorta

pulmonary vein

RA

LA

the left ventricle contracts forcing blood out of the aorta to the body

the valve stops the blood flowing back into the left atrium

RV

LV

slide30

RA

LA

RV

LV

slide31

RA

LA

the left side of the heart receives oxygenated blood from the lungs and pumps it around the body

RV

LV

slide32

RA

LA

the right side of the heart receives deoxygenated blood from the body and pumps it to the lungs to be oxygenated

RV

LV

slide33

The heart is divided into right and left sides

RIGHT SIDE

of heart

Receives

and pumps

DEOXYGENATED

BLOOD

LEFT SIDE

of heart

Receives

and pumps

OXYGENATED

BLOOD

4 chambers

ATRIA receive blood fromVEINS

VENTRICLES pump blood away from heart in ARTERIES

LORD

blood vessels
Blood Vessels
  • The blood circulates around the body more than a thousand times a day
  • Arteries
  • Arterioles
  • Capillaries
  • Venules
  • Veins
blood vessels arteries
Blood Vessels: Arteries
  • Carry blood Away from the heart
  • Carry oxygenated blood – except for the pulmonary artery which is going to the lungs to be re-oxygenated
  • Have thick, elastic walls to withstand high blood pressure
  • The blood moves in pulses due to the pumping action of the heart
arterioles
Arterioles
  • Smallest arteries
  • Made mostly of smooth muscle
  • This means the diameter can vary, so blood can be diverted to where it is most needed.
blood vessels veins
Blood Vessels: Veins
  • Carry blood back to the heart – gravity means this is not an easy job!
  • Carry deoxygenated blood
  • Have thin walls because the blood travels at low pressure
  • Muscles around the veins contract to help move the blood back towards the heart
  • Veins have one-way valves to stop blood flowing backwards
slide40

Artery vs. Vein Structure

Larger Lumen (space in middle) – less resistance to blood flow

Thick muscular & elastic wall – gradually reduces the harsh surge of blood to a steadier flow

blood vessels capillaries
Blood Vessels: Capillaries
  • Join arteries to veins
  • Very tiny blood vessels that reach all the cells of the body – thin permeable walls
  • Capillaries provide cells with “food”, oxygen & water and remove wastes like carbon dioxide