The filtration process in the renal corpuscle is regulated by several mechanisms. The diameter of the afferent and efferent arterioles can be adjusted to control glomerular blood flow and pressure. Additionally, the filtration barrier's properties ensure that only certain molecules are filtered based on size and charge. Hormones such as angiotensin II and atrial natriuretic peptide can also influence glomerular filtration rate by acting on these arterioles.