Answer in brief

1. The Bowman's capsule is a cup-like sac at the beginning of the tubular component of a nephron in the mammalian kidney that performs the first step in the filtration of blood to form urine.

2. Fluids from blood in the glomerulus are collected in the Bowman's capsule and further processed along the nephron to form urine. This process is known as ultrafiltration.

 

3. The coelom is lined by tissue derived from mesoderm. This lining is generally called peritoneum.