Biology 101: Kidney and Excretory System Flashcards Actual Exam 2024-2025 latest version Questions and Accurate Answers Verified 100% Already Graded A+ Q1 What are the two main structural components of the kidney? Answers: 1. cortex 2. medulla The cortex, or outer layer of the kidney, contains the proximal and distal convoluted tubules of the nephrons. The medulla, or inner region, contains the loops of Henle. 3 Q List four primary functions of the kidneys. Answers: Regulation of blood pressure Regulation of blood osmolarity Regulation of blood pH Excretion of soluble wastes 5 Q What is filtration? Answers: The process by which fluid, molecules, and ions leave the blood. Filtration is promoted by hydrostatic pressure. The material filtered into the glomerulus is called the filtrate. 6 Q In the context of the kidney, what is secretion? Answers: The process by which ions or molecules move from the blood into the nephron, joining the filtrate. These substances will then be excreted. Secretion of protons and waste products occurs at the proximal and distal convoluted tubules.7 Q What is reabsorption? Answers: The process by which water, molecules, and ions are transported from the filtrate back into the blood. As a result, these compounds