A-LevelBiologyTransport in mammalsMay/June 2021Paper 2 Q315 Marks
In mammals, some cell signalling molecules are steroid (lipid) hormones. These hormones are transported in the bloodstream to reach capillary networks. At a capillary network, hormones pass out of the blood into tissue fluid. (a) Fig. 3.1 is a diagram of a capillary network. blood from artery tissue fluid X Fig. 3.1 body cells blood to vein
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