The circulatory system

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Slide 1: Vidéo

BiologieMiddelbare schoolvwoLeerjaar 2

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Slide 1 - Vidéo

3.1 Blood

Blood transports everything your body need

(heat, nutrients, oxygen, waste products)

Blood contains:

- blood plasma (Proteins- fibrinogen for clotting blood,

water, carbon dioxide

oxygen waste products

nutrients

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Red blood cells

small round discs,

no nucleus

red pigment: haemoglobin absorb and release oxygen

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white blood cells

do not have a fixed shape

do have a nucleus

destroy pathogens

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platelets

fragments of cells that have broken up

- Clotting when the blood is outside the vessels

Trombosis- clottering of blood in the vessel

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Blood vessels

3 types of blood vessels

arterie, capillarie, vein

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Artery

From heart to organs

(red) transport O2

walls are:
- thick, firm, elastic

High blood pressure

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Capillaries

Release O2 into organs

Absorb Co2 into bloodstream

- one cell layer tick walls

- white bloodcells can go between the cells into the tissue

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Veins

Transport CO2 from organs to the heart

- low bloodpressure

thinner, less elastic

Includes valves

- The blood can flow in 1 direction

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3.3 The heart

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the heart is part of the systemic circulation.

It needs O2 (respiration) the coronary arteries provide O2 to the heart.
The coronary veins brings CO2 back to the heart

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the heart

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coronary artery, capillaries, coronary vein

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pulmonary circulation /septum, / systemic circulation

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valves

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Cardiac cycle - 70 times a minute= heart rate

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