Final answer:
The rate of primary-urine production by all of an organism's renal tubules is called the glomerular filtration rate (GFR), a key measure of kidney function and an essential component in urine formation.
Step-by-step explanation:
The rate of primary-urine production by all of an organism's renal tubules is called the glomerular filtration rate (GFR). This rate measures the volume of filtrate formed by both kidneys per minute and is a crucial indicator of kidney function. The GFR is influenced by factors such as hydrostatic pressure and colloid osmotic pressure, with hydrostatic pressure typically being the dominant force promoting filtration.
The filtration process takes place in the renal corpuscle, involving the glomerulus and Bowman's capsule, which work together to filter blood plasma. Within the nephron, filtration, reabsorption, and secretion are the three primary functions essential for the formation of urine. The physiology of urine formation ensures homeostatic balance, and proper functioning of renal tasks, including control over blood pressure, red blood cell production, and calcium absorption.