The nitrogenous waste product that requires the maximum amount of water for excretion is:

In the human kidney, the renal pelvis:

ADH is synthesized in the:

All filtered glucose is reabsorbed in the normal kidney because:

In the kidney cross-section, the osmolarity of the interstitium in zone X (renal cortex) and zone Y (inner medulla) is approximately: <svg xmlns="http://www.w3.org/2000/svg" width="500" height="300" viewBox="0 0 500 300"> <rect width="500" height="300" fill="#faf9f5" rx="8"/> <text x="250" y="18" text-anchor="middle" font-family="sans-serif" font-size="14" font-weight="bold" fill="#c6613f">Kidney — Internal Structure</text> <!-- Kidney outline --> <path d="M120,50 Q80,100 80,150 Q80,220 120,260 Q150,285 190,280 Q220,275 230,250 L232,245 Q235,240 230,230 Q225,220 230,210 Q235,200 240,195 L245,192 Q260,185 260,170 Q260,155 250,145 Q240,140 240,130 Q240,115 250,105 Q260,95 260,80 Q260,65 240,55 Q220,42 180,42 Q140,42 120,50 Z" fill="none" stroke="#14140f" stroke-width="3"/> <!-- Renal cortex (outer band) --> <path d="M120,50 Q80,100 80,150 Q80,220 120,260 Q150,285 190,280 Q220,275 230,250 L232,245 Q235,240 230,230 Q225,220 230,210 Q235,200 240,195 L245,192 Q260,185 260,170 Q260,155 250,145 Q240,140 240,130 Q240,115 250,105 Q260,95 260,80 Q260,65 240,55 Q220,42 180,42 Q140,42 120,50 Z" fill="#f4c6a0" stroke="none"/> <!-- Medullary region (inner) --> <path d="M135,75 Q105,120 105,155 Q105,210 135,240 Q155,260 185,258 Q205,255 215,238 Q220,230 218,220 Q215,210 220,200 Q225,192 232,188 Q243,182 243,170 Q243,158 235,150 Q228,144 228,132 Q228,118 236,108 Q243,100 243,85 Q243,72 228,64 Q215,56 185,56 Q150,56 135,75 Z" fill="#e8a06a" stroke="none"/> <!-- Medullary pyramids --> <polygon points="160,100 130,180 190,180" fill="#d4845a" stroke="#14140f" stroke-width="1"/> <polygon points="175,90 145,170 205,170" fill="#d4845a" stroke="#14140f" stroke-width="1" opacity="0.8"/> <polygon points="165,130 140,200 190,200" fill="#d4845a" stroke="#14140f" stroke-width="1"/> <!-- Renal pelvis (central cavity) --> <path d="M195,130 Q215,140 225,155 Q230,165 225,180 Q220,195 210,205 Q200,215 195,225 Q192,230 200,240 L210,250 Q190,240 185,225 Q178,210 175,195 Q172,180 175,165 Q178,150 185,140 Z" fill="#faf9f5" stroke="#14140f" stroke-width="1.5"/> <!-- Papilla tips --> <circle cx="188" cy="178" r="3" fill="#c6613f"/> <circle cx="182" cy="168" r="3" fill="#c6613f"/> <circle cx="185" cy="198" r="3" fill="#c6613f"/> <!-- Ureter --> <path d="M200,240 Q210,260 215,280 Q218,295 220,300" fill="none" stroke="#14140f" stroke-width="3"/> <path d="M200,240 Q210,260 215,280 Q218,295 220,300" fill="none" stroke="#e8a06a" stroke-width="2"/> <!-- Renal artery --> <line x1="260" y1="148" x2="240" y2="155" stroke="#c6613f" stroke-width="3"/> <line x1="280" y1="142" x2="260" y2="148" stroke="#c6613f" stroke-width="3"/> <!-- Renal vein --> <line x1="260" y1="172" x2="240" y2="170" stroke="#4a6fa5" stroke-width="3"/> <line x1="280" y1="176" x2="260" y2="172" stroke="#4a6fa5" stroke-width="3"/> <!-- Labels with leader lines --> <line x1="130" y1="65" x2="310" y2="45" stroke="#14140f" stroke-width="0.8"/> <text x="315" y="48" font-family="sans-serif" font-size="12" fill="#14140f">Renal Cortex</text> <line x1="160" y1="150" x2="310" y2="75" stroke="#14140f" stroke-width="0.8"/> <text x="315" y="78" font-family="sans-serif" font-size="12" fill="#14140f">Renal Medulla (Pyramids)</text> <line x1="200" y1="180" x2="310" y2="110" stroke="#14140f" stroke-width="0.8"/> <text x="315" y="113" font-family="sans-serif" font-size="12" fill="#14140f">Renal Pelvis</text> <line x1="215" y1="275" x2="310" y2="145" stroke="#14140f" stroke-width="0.8"/> <text x="315" y="148" font-family="sans-serif" font-size="12" fill="#14140f">Ureter</text> <line x1="280" y1="142" x2="310" y2="180" stroke="#14140f" stroke-width="0.8"/> <text x="315" y="183" font-family="sans-serif" font-size="12" fill="#c6613f" font-weight="bold">Renal Artery</text> <line x1="280" y1="176" x2="310" y2="210" stroke="#14140f" stroke-width="0.8"/> <text x="315" y="213" font-family="sans-serif" font-size="12" fill="#4a6fa5" font-weight="bold">Renal Vein</text> <line x1="245" y1="160" x2="310" y2="240" stroke="#14140f" stroke-width="0.8"/> <text x="315" y="243" font-family="sans-serif" font-size="12" fill="#14140f">Hilum</text> </svg>