IMMUNOLOGY

Detailed explanation-1: -Lymphatic vessels: Lymphatic vessels are the network of capillaries (microvessels) and a large network of tubes located throughout your body that transport lymph away from tissues. Lymphatic vessels collect and filter lymph (at the nodes) as it continues to move toward larger vessels called collecting ducts.

Detailed explanation-2: -The thoracic duct is the largest lymphatic vessel in the human body. Around 75% of the lymph from the entire body (aside from the right upper limb, right breast, right lung and right side of the head and neck) passes through the thoracic duct. The cells of the immune system circulate through the lymphatic system.

Detailed explanation-3: -Lymphatic capillaries have thin walls, only as thick as a single cell. The cells overlap each other so that interstitial fluid easily enters the capillaries.

Detailed explanation-4: -Similar in structure to veins, lymph vessel walls consist of the tunica intima, tunica media, and tunica adventitia. Tunica Intima: lymph vessel inner layer composed of smooth endothelium (a type of epithelial tissue). This layer contains valves in some lymph vessels to prevent fluid backflow.