Arterioles.
Capillary beds
Exchange
No
capillary beds
Infants have a higher density of capillary beds in their tissues, which supports their rapid growth and metabolic demands. This extensive capillary network facilitates efficient oxygen and nutrient delivery while also aiding in thermoregulation. As infants grow, the distribution and density of these capillary beds change to adapt to their developing body and physiological needs.
arterioles
everywhere throughout the body
An arteriole transports oxygenated blood from the arteries to the capillary beds and a venule transports de-oxygenated blood from the capillary beds to the veins.
Im not sure what supplies them but im positive there drained by venules. Capillary beds are drained by small veins called venules, and are supplied by small arteries called arterioles.
Capillary beds of the muscles
Capillary beds of the muscle
portal veins