Would red blood cells be present in the renal filtrate?

No, red blood cells would not be present in the renal filtrate. The glomerulus, which is the filtering unit of the kidney, has a semipermeable membrane that allows water, ions, and small molecules to pass through but prevents the passage of larger molecules such as red blood cells, white blood cells, and proteins.

As blood flows through the glomerulus, water, ions, and small molecules are forced out of the blood and into the Bowman's capsule, which is the cup-shaped structure that surrounds the glomerulus. This fluid is then called the renal filtrate. The renal filtrate is then further processed in the tubules of the kidney where more water and ions are reabsorbed and some substances, such as drugs or waste products, are secreted into the filtrate. The final product is urine which is then transported to the bladder for storage.