Capillaries are really tiny blood vessels that have permeable wall so that substances can diffuse in and out
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What are capillary beds?
Network of capillaries in tissue
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How is tissue fluids formed?
Tissue fluids are formed when blood passes through capillary beds and small molecules are forced out of the capillaries. Tissue fluid surrounds the cells.
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What is the function of tissue fluids?
They allow cells to get substances they need and get rid of waste
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What is the job of a skeleton?
A skeleton supports the body and allows it to move as well as protects vital organs
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What are ligaments and what are its properties?
Ligaments hold the bones at a joint together. Has high tensile strength-doesn’t snap easily. They are slightly elastic to stabilise joints but still allow movement.
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Why are the ends of bones covered in a smooth layer of cartilage?
Cartilage reduces friction between the bones. And to acts like a shock absorber when compressed slightly.
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What do membranes at some joints release?
They release an oily synovial fluid to lubricate the joints which allows them to move more easily by reducing friction.
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What do tendons do?
Attach the bones to muscles
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How to muscles move bones at a joint?
By contracting- becoming shorter
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What happens when a muscles contracts?
The tendon pulls on the bone as tendons cant stretch. And this transmits the force from the muscle to bone.
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What do muscles have to do to move a joint?
Push
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Do muscles come in pairs?
Yes they are called antagonistic pairs. For example biceps and triceps are an antagonistic pair of muscles.
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What happens when one muscle in the pair contracts?
The joint moves in one direction.
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What happens when the other muscle in the pair contracts?
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