The diagram represents a capillary network, associated vessels and cells - Scottish Highers Human Biology - Question 5 - 2017
Question 5
The diagram represents a capillary network, associated vessels and cells.
(a) (i) Name the type of blood vessel labelled X.
(ii) State how blood vessel X can reduce... show full transcript
Worked Solution & Example Answer:The diagram represents a capillary network, associated vessels and cells - Scottish Highers Human Biology - Question 5 - 2017
Step 1
Name the type of blood vessel labelled X.
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Answer
The type of blood vessel labelled X is an artery or arterioles.
Step 2
State how blood vessel X can reduce blood flow to the capillary network.
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Answer
Blood vessel X can reduce blood flow to the capillary network by vasoconstriction, which involves the contraction of the muscular walls that narrows the lumen of the vessel.
Step 3
Name the layer of cells which forms the wall of a capillary.
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The layer of cells that forms the wall of a capillary is the endothelium.
Step 4
Describe how substances pass from plasma to tissue fluid.
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Substances pass from plasma to tissue fluid primarily through pressure filtration. The high hydrostatic pressure in the capillaries forces substances out into the surrounding tissue.
Step 5
Name a type of molecule which is present in plasma but absent in tissue fluid.
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Proteins are a type of molecule that are present in plasma but absent in tissue fluid.
Step 6
Describe one role of the lymph vessel in the diagram.
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One role of the lymph vessel in the diagram is to absorb excess tissue fluid and return it to the blood/circulatory system.
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