Figure 2.7 Model of amino acid absorption in the midgut of a caterpillar (Philosamia cynthia).

Note: A goblet cell is shown between two columnar absorptive cells. The left columnar cell shows leucine, Na+ and K+ concentrations and Vt = 120 mV pH values in the lumen, cell and haemolymph. The goblet cell shows mechanisms involved in K+ transport. The right columnar cell shows mechanisms involved in amino acid (aa) absorption and apical (Va), basal (Vb) and transepithelial (Vt) electrical potential differences. Basal exit mechanisms for amino acids are less well known.

Source: Biology of the Insect Midgut, 1996, pp. 265-292, Sacchi and Wolfersberger, with kind permission of Kluwer Academic Publishers.

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