UNIT 2 The nutrition function Natural Science 2. Secondary Education DIFFERENT CIRCULATORY SYSTEMS
UNIT 2 The nutrition function Natural Science 2. Secondary Education DIFFERENT CIRCULATORY SYSTEMS.
Jan 18, 2016
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UNIT
2The nutrition function
Natural Science 2. Secondary Education
DIFFERENTCIRCULATORY SYSTEMS
UNIT
2Different circulatory systems
CIRCULATORYSYSTEMS
Click on each box to find out more
two types
can be
OPEN CLOSED
SINGLE DOUBLE
Natural Science 2. Secondary Education
• They are present in most animals and consist of:
• A circulating liquid, like blood, that transports substances throughout the organism.
• Vessels, which the liquid travels through.
• A pumping mechanism, the heart, which moves the liquid.
Circulatory systems
Blood vessels:ArteriesVeinsCapillaries
Heart
An example of a closed circulatory system, that of a mammal.
UNIT
2Different circulatory systems
Go back to the Start menuNatural Science 2. Secondary Education
• Found in arthropods and molluscs.
• The circulating liquid leaves the vessels to bathe the organism’s tissues with oxygen and nutrients. Once substances have been exchanged with the tissues, the liquid is drawn back to the vessels.
Animals with open circulatory systems
The open circulatory system of an arthropod
The circulating liquid is transported through the vessels to the tissues, where substances are exchanged.
A hole-filled heart pumps the circulating liquid.
UNIT
2Different circulatory systems
Go back to the Start menuNatural Science 2. Secondary Education
• Found in vertebrates and some invertebrates, such as annelids.
• The circulating liquid is only found inside the vessels. The exchange of substances takes place through the walls of the smallest vessels, called capillaries.
• There are two types:
• Single
• Double
The closed circulatory system of a fish
A heart with no holes pumps the circulating liquid.
The circulating liquid stays inside the vessels.
Substances are interchanged in the capillaries.
UNIT
2Different circulatory systems
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Animals with closed circulatory systems
Natural Science 2. Secondary Education
• Found in some invertebrates and in fish.
• The heart pumps the circulating liquid, which travels to the respiratory organs, where it absobs oxygen. From there it travels throughout the rest of the body.
• After interchanging substances with the body, the blood goes back to the heart.
The single closed circulatory system of a fish
1: The heart pumps the blood.
2: The blood goes to the gills, where oxygen is absorbed.
3: The blood travels throughout the body interchanging substances.
4: The blood travels from the different organs back to the heart.
UNIT
2Different circulatory systems
Go back to the Start menu
Animals with single closed circulatory systems
Natural Science 2. Secondary Education
• Found in land vertebrates.
• The heart pumps the blood to the lungs in pulmonary circulation. The blood releases carbon dioxide and absorb oxygen.
• The blood then returns to the heart, where it is pumped to the organs. Substances are interchanged in the organs.
• The blood then travels from the different organs back to the heart.
The double closed circulatory sytem of a bird
1: The heart pumps the blood.
2: The blood travels to the lungs, where it absorbs oxygen, and returns to the heart.
3: The heart pumps the blood again, which flows to different organs.
4: The blood travels from the different organs back to the heart.
UNIT
2Different circulatory systems
Go back to the Start menu
Animals with double closed circulatory systems
Natural Science 2. Secondary Education
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