Peritubular capillaries

The blood then flows to the peritubular capillaries. This is where the substances needed by the body are taken back into the blood from the tubules (reabsorption), as described in the tubule story above.  The peritubular capillaries connect to increasingly large veins, taking the deoxygenated blood back to the heart.

Soon, the only way anything could be seen in the gallery was through a periscope on a long tube, wearing a cap (peritubular capillaries).