Answer:
Peritubular capillaries.
Explanation:
Proximal convoluted tubules plays an important role in the process of urine formation. This tubule is present between the convoluted parts of loop of henle and bowman's capsule.
Peritubular capillaries are the small blood vessels that are mainly supplied by efferent arterioles. These capillaries help in the secretion and reabsorption between the blood and the lumen of the nephron. Peritubular capillaries are surrounded in the proximal convoluted tubules.
Thus, the answer is peritubular capillaries.
