BIOLOGY 7: Tissue Fluid & The Skeletal System

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What are capillaries?
Really tiny blood vessels
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What type of walls do capillaries have?
Permeable walls
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How do permeable walls affect substances?
Substances can diffuse in and out of them
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What are networks of capillaries in tissue called?
Capillary beds
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How is tissue fluid formed?
Blood passes through capillary beds and the small molecules that are forced out form the tissue fluid
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What small molecules does tissue consist of?
Water, glucose and oxygen
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How do waste chemicals get from cells to capillaries?
The waste chemicals diffuse out of the cells, into the tissue fluid, then into the capillaries
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What does the tissue fluid allow cells to do?
Get the substances they need and get rid of waste without a capillary supplying every single cell with what it needs
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What is the job of a skeleton?
To support the body, to allow the body to move, and to protect vital organs
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What is a vertebrate?
Animals that have an internal skeleton and a backbone
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What are bones held together with?
Ligaments
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What do joints allow bones to do?
Move
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What properties do ligaments have?
They have a high tensile strength and they are highly elastic
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How does having a high tensile strength and being slightly elastic help ligaments?
They can stabilise joints but still allow movement
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What are the ends of bones covered with?
Cartilage
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Why are the ends of bones covered with cartilage?
To reduce friction
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Why do some synovial membranes release synovial fluid?
To lubricate joints and reduce friction
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What do some synovial membranes release?
Synovial fluid
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How are bones attached to muscles?
By tendons
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How are bones attached to other bones?
By tendons
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How do muscles move bones?
By contracting
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What moves bones?
Muscles
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Can muscles only push or only pull?
Pull
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Why do muscles work in antagonistic pairs?
Because they can only pull
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What type of pairs do muscles work in?
Antagonistic pairs
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What does it mean when you say muscles work in 'antagonistic pairs'?
When one muscle contracts, the joint moves in one direction. When the other muscle contracts, it moves in the opposite direction
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In which direction does the other muscle move when one contracts?
In the opposite direction
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Other cards in this set

Card 2

Front

What type of walls do capillaries have?

Back

Permeable walls

Card 3

Front

How do permeable walls affect substances?

Back

Preview of the front of card 3

Card 4

Front

What are networks of capillaries in tissue called?

Back

Preview of the front of card 4

Card 5

Front

How is tissue fluid formed?

Back

Preview of the front of card 5
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