the system that allows blood and other vital substances to flow throughout our body. It is a network which reaches every part of our body.
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Blood is
is a red liquid that fills the circulatory system. It collects, transports and releases oxygen, nutrients and waste.
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Blood vessels are
Blood vessels are the tubes that circulate the blood.
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The arteries
The arteries carry blood from the heart to the organs, transporting nutrients and oxygen
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The veins
The veins carry blood back from the organs to the heart, transporting waste and carbon dioxide.
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The capillaries
The capillaries connect the arteries and veins to exchange substances.
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The Heart
The heart is a hollow organ with four cavities surrounded by muscular walls. It pushes blood to the blood vessels connected to it.
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When the heart beats, it does two things
It expands and allows blood to enter and it contracts and allows blood to flow out into the vessels.
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The blood path in the circulatory system
In the circulatory system, the blood leaves the heart through the blood vessels which distribute the blood around the body.
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What things does blood carry?
The blood carries substances, nutrients and oxygen, to where they are needed, and it collects the waste and carbon dioxide which are released.
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Parts of the blood flowing process
1. The blood leaves the heart 2.The blood reaches the organs. The blood flows through the capillaries to the organs. 3. The blood returns to the heart via the c
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Excretion occurs when
Our body releases the waste that the blood collects from the organs.
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Parts of our body that release waste
The parts of our body that release waste are the lungs, which release carbon dioxide, the excretory system and the sweat glands
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The excretory system is formed by
the kidneys and the urinary tract
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the urinary tract is made up of
ureters which connect the kidneys to a storage bag called the bladder
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Mention the functions of the kidneys (what they produce and do)
The kidneys filter the blood and collect waste substances and produce urine with waste substances and water