PATHOLOGY

Detailed explanation-1: -Identification of Blood Vessels Veins have thin walls but typically have wider lumen (lumen size may vary depending on specific artery or vein) Capillaries are very small and will not be easily detected under the same magnification as arteries and veins.

Detailed explanation-2: -The cavity or channel within a tube or tubular organ such as a blood vessel or the intestine.

Detailed explanation-3: -Capillaries have the smallest lumen but relative to their size the lumen is quite large. This is because capillaries are where exchange of oxygen, nutrients and waste products occur between blood and tissues so they have evolved to have the greatest surface area to volume ratio to increase efficiency of the exchange.