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The diagram below shows blood circulation in a mammalian tissue.
(a) Name the parts labeled P and Q.
(b) Name the substances that are:
(i) Required for respiration that move out of capillaries
(ii) Removed from tissue cells as a result of respiration.
(c) Explain how substances move from blood capillaries into the tissue cells.
(d) Name one component of the blood that is not found in the part labeled P.