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6.1 Schematic representation of the circulatory system with selected lymph vessels (König and Liebich, 2009).

6.2 Types of capillary (schematic). A: continuous capillary, B: fenestrated capillary, C: sinusoidal capillary.

6.3 Scanning electron micrograph of a capillary bed
in the vascular tunic of the eye (injected specimen,
courtesy of Prof. König, Vienna).

open to the exterior. This process typically involves specific
receptors for signalling molecules and proteins (receptor-
mediated transcytosis).
Material endocytosed by the capillary endothelium
may also be taken up by lysosomes.
The capillary wall plays a fundamental role in the
uptake and exchange of O and CO . These gases, as well
2 2
as low-molecular weight substances and ions, pass through
the endothelium by diffusion across a concentration

Vet Histology.indb 120 16/07/2019 14:57