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The Circulatory System

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OB14, OB15

Understand the structure and function of the heart, identify the four chambers of the heart, and explain the difference between the left and right ventricles

Describe the passage of blood through the heart and lungs via arteries and veins, identify the pulmonary artery and vein, aorta and vena cava, and distinguish between arteries, veins and capillaries

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There are THREE types of blood vessels ARTERIES

carry blood away from the heart

Thick, muscular, stretchy wall

narrow central tube

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VEINS carry blood towards

the heart thin walls with little

muscle wide central tube have valves

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CAPILLARIES

carry blood between arteries and veins

wall only one cell thick

very narrow central tube

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Thick muscular walls Divided into 4

chambers Right side pumps

blood to lungs Left side pumps

oxygenated blood from the lungs to ALL parts of body

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The heart is divided into

FOUR chambers

Right Ventricle

Right Atrium

Left Atrium

Left Ventricle

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The heart has four

major blood vessels

VENA CAVA PULMONARY

VEIN

AO

RT

A

PU

LM

ON

AR

YV

EIN

VENA CAVA

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Red blood cell collects OXYGEN in the lungs

2The oxygenated cell travels along the pulmonary vein to the LEFT ATRIUM

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Oxygenated blood carried to ALL parts of body via the AORTA

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Deoxygenated blood carried back from all parts of body

via the VENA CAVA

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Deoxygenated blood sent back to the lungs for oxygen via the PULMONARY

ARTERY

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Inside every cell oxygen is used

in RESPIRATION

to produce

WATER + CARBON DIOXIDE +

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Draw a flow chart

Show the route of a red blood cell1. Starting at lungs and moving via heart to

arm2. Leaving the arm and returning back to

the lungs3. Labelled oxygenated blood cells (red),

deoygenated blood cells (blue), the heart, lungs, arteries and veins

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HEART

LUNGS

VEIN carrying deoxygenated

blood back to heart

ARTERY carrying oxygenated

blood to leg

Circulatory system

Artery – red

Vein - blue