The secretion of which hormone increases the permeability of cells in the collecting ducts to water so more can be reabsorbed?

A. Epididymis: The epididymis is where sperm mature and are stored. It is not cut during a vasectomy.

B. Tunica albuginea: This is the connective tissue surrounding the testis, not part of the sperm-carrying duct system.

C. Efferent ductules: These ducts transport sperm from the testis to the epididymis, but they are not cut during a vasectomy.

D. Ductus deferens: The ductus deferens (vas deferens) is the tube that carries sperm from the epididymis to the ejaculatory duct. It is cut and sealed during a vasectomy, preventing sperm from reaching the urethra.

A. Glomerulus: The glomerulus is a high-pressure capillary bed in the nephron where filtration of blood occurs.

B. Bowman's capsule: This is the cup-shaped structure surrounding the glomerulus, not a capillary bed.

C. Vasa recta: These are capillaries surrounding the loop of Henle, involved in the reabsorption process, not filtration.

D. Macula densa: This is a group of specialized cells in the distal convoluted tubule that sense sodium concentration and affect glomerular filtration rate, but it is not a capillary bed.