Final answer:
Blood indeed comes to the glomerulus via the afferent arteriole, and this process is crucial for the filtration that occurs within the nephrons of the kidney, specifically in the cortex area. Sufficient systemic blood pressure is necessary for effective filtration.
Step-by-step explanation:
The statement that blood comes to the glomerulus via the afferent arteriole is true. The afferent arterioles deliver blood to the high-pressure capillaries of the glomerulus, which is part of the nephron, the functional unit of the kidney. The blood then passes through the glomerular capillaries where filtration based on particle size occurs. Post filtration, the blood leaves the glomerulus through the efferent arteriole, which then forms a capillary network around more distal parts of the nephron tubule, including the peritubular capillaries and vasa recta, before returning to the venous system.
It is also worth mentioning that the nephron is located in the cortex of the kidney, and not in the medulla. The statement that systemic blood pressure must stay above 60 to ensure proper filtration is true, as sufficient pressure is needed for the glomerular filtration process to occur efficiently.