Final answer:
Filtrate includes fluids, solutes, and is the substance that passes through a filter. In human kidneys, this process occurs during glomerular filtration, where water and solutes are pushed out of the blood and into the kidneys to eventually form urine.
Step-by-step explanation:
Filtrate encompasses various components during the filtration process. Specifically, it:
- Includes fluids: such as water, which is essential in the transport of dissolved substances.
- Includes solutes: small molecules that dissolve in the fluid, such as salts and organic compounds.
- Passes through the filter: the physical barrier that separates solids from the fluid and solutes.
In biological systems, such as the human body, glomerular filtration is an example where blood pressure pushes water and solutes from blood plasma in the kidneys through the glomerular capillaries and into Bowman's capsule, forming filtrate that includes water, salts, nutrients, and waste products. Subsequently, most solutes are reabsorbed in the proximal convoluted tubule by tubular reabsorption, while additional solutes and wastes are secreted into the kidney tubules during tubular secretion.