What are venacava (or) caval veins?

A portal vein is

Largest vein

What happens if there are no valves in veins?

Number of hepatic portal veins and renal portal veins in frog respectively are

What are annelids? What are their characters?

Read the following sentences. (1) Blood vessels carry blood from body parts are veins (2) Arteries are not strong as veins (3) Pulmonary artery carrles blood from.heart to lungs (4) Superior venacava collects deoxygenated blood from upperpart of the body like head and neck. What are correct sentences ?

What might be the reason for renal vein carries, pure deoxygenated blood ?

What was the classical experiment conducted by William Harvey to demonstrate movement of blood in veins ?

What are reactants ? What are products ?