IMMUNOLOGY

Detailed explanation-1: -Lymphatic capillaries are similar to blood capillaries, but they are larger in diameter and have closed ends. Unlike blood capillaries, fluid can flow into lymph capillaries but can’t flow out through the cell walls. It can only move forward.

Detailed explanation-2: -A similarity between lymphatic and blood capillaries is that they are both microscopic tubes and form networks in the intercellular spaces within organs.

Detailed explanation-3: -Lymphatic capillaries are blind-ended tubes with thin endothelial walls (only a single cell in thickness). They are arranged in an overlapping pattern, so that pressure from the surrounding capillary forces at these cells allows fluid to enter the capillary (see the image below).

Detailed explanation-4: -Blood vessels deliver oxygen and nutrients to virtually all cells in developing mammalian embryos and adults, whereas lymphatic vessels drain the interstitial fluid that collects in tissues, and serve as a conduit for immune cell trafficking and fat absorption.