The movement of substances out of the glomerulus and into Bowman's capsule is referred to as:

• A. secretion
• B. filtration
• C. diffusion
• D. reabsorption

Answer: (B)

Verified step by step guidance

1. Understand the structure and function of the glomerulus and Bowman's capsule: The glomerulus is a network of capillaries in the kidney that filters blood, while Bowman's capsule is a cup-shaped structure that collects the filtrate.
2. Learn the process of filtration: Filtration is the movement of water and solutes from the blood in the glomerulus into Bowman's capsule due to pressure differences. This process is driven by hydrostatic pressure.
3. Differentiate filtration from other processes: Secretion involves the active transport of substances from the blood into the nephron tubules, reabsorption is the movement of substances from the nephron back into the blood, and diffusion is the passive movement of molecules from high to low concentration.
4. Recognize that filtration is a passive process: It does not require energy and occurs due to the pressure gradient created by the blood pressure in the glomerulus.
5. Conclude that the movement of substances from the glomerulus into Bowman's capsule is specifically referred to as filtration, as it involves the initial step of forming the filtrate in the nephron.