The urinary system contributes to homeostasis through several roles which include: (Select all that apply)

A. Stimulation of hair follicles: Hair follicle activity is influenced by androgens (testosterone), but LH does not directly stimulate hair follicles -not LH’s primary role.
B. Regulating gamete production and maturation:FSH primarily stimulates Sertoli cells and spermatogenesis; LH contributes indirectly via testosterone but LH itself mainly stimulates hormone production -part of the broader regulation but not the primary direct role.
C. Stimulating estrogen production: LH does not primarily stimulate estrogen production in males; estrogen in males arises by aromatization of androgens and is not LH’s main target.
D. Stimulating testosterone production: LH acts on Leydig cells in the testes to stimulate testosterone synthesis, which is LH’s primary role in males.

A. Proximal convoluted tubule: The PCT reabsorbs the majority of filtered water and solutes (≈65% Na⁺/H₂O, all filtered glucose and amino acids, many ions).
B. Efferent arteriole: An efferent arteriole is a blood vessel leaving the glomerulus (carries blood), not a tubular segment that reabsorbs filtrate.
C. Afferent arteriole: Afferent arteriole supplies blood to the glomerulus; it is not involved in tubular reabsorption.
D. Loop of Henle: The loop helps concentrate urine (water reabsorption in the descending limb, ion transport in the ascending limb) but the PCT is the primary site for bulk reabsorption.