In which part of the nephron does the filtration of blood occur?

While repairing a frayed utility wire, Kevin, an experienced lineman, slips and falls to the ground. Medical examination reveals a fracture of his lower spine and transection of the lumbar region of the spinal cord. How will Kevin's micturition be controlled from this point on? Will he ever again feel the need to void? Will there be dribbling of urine between voidings? Explain the reasoning behind all your responses.

Contrast the following homeostatic imbalances: oliguria, anuria, polyuria, and nocturia.

Describe the changes that occur in kidney and bladder function in old age.