Answer:
Afferent arteriole
Explanation:
A glomerulus is formed from the afferent blood vessels, a branch from the renal artery. The afferent arteriole collects blood from the glomerulus and extends to the renal tubule where it divides into capillaries that ramify the tubule. The afferent arteriole is wider than the efferent arteriole.
Cancerous cells go through interphase so fast, that they are constantly multiplying in mitosis.
A constant variable would be an element that remains unchanged and constant throughout the course of the experiment / investigation.