Question

what is glomerular filtration?

the process of filtering nutrients through the glomerulus into bowmans capsule.

the process of filtering urine through the glomerulus into bowmans capsule.

the process of filtering blood through the nephron into bowmans capsule.

the process of filtering blood through the glomerulus into bowmans capsule.

the process of filtering oxygen through the glomerulus into bowmans capsule.

Explanation:

Glomerular filtration is a key process in the nephron (the functional unit of the kidney). The glomerulus is a network of capillaries. Blood flows through the glomerulus, and due to the pressure in the capillaries and the structure of the filtration membrane (composed of endothelial cells of the capillary, basement membrane, and podocytes of Bowman's capsule), small molecules (water, ions, glucose, amino acids, etc.) and waste products (like urea) are filtered out from the blood. This filtrate then enters Bowman's capsule. Nutrients are not the main thing being filtered - it's blood components. Urine is formed later after re - absorption and secretion processes. The nephron is the whole unit, and filtration specifically occurs at the glomerulus (not the whole nephron). Oxygen is mainly transported by red blood cells and is not filtered in this process.

Answer:

The process of filtering blood through the glomerulus into Bowman's capsule.