Explain the Mechanism of Urine FormationMechanism of Urine Formation It has four steps - ultra filtration, selective reabsorption, secretion and concentration.https://www.youtube.com/watch?v=w4jnXb3VjhA(i) Ultra Filtration. Blood flows inside glomerulus under pressure due to narrowness of efferent arteriole. As a result it undergoes pressure filtration or … [Read more...] about Explain the Mechanism of Urine Formation