Ambient temperature is the term used to identify the surrounding or environmental temperature. It is the nature and tendency of all things to approach ambient temperature. If you are in a room, then the ambient temperature is the room temperature.
An arteriole is a small-diameter blood vessel in the microcirculation that extends and branches out from an artery and leads to capillaries. Arterioles have muscular walls and are the primary site of vascular resistance. The greatest change in blood pressure and velocity of blood flow occurs at the transition of arterioles to capillaries.
Composed of a thick muscular wall, arterioles actively constrict and relax by means of myogenic, hormonal, and pharmacological mechanisms (19, 21). As the major vascular component that controls peripheral resistance, the arterioles are distinct from conduit arteries. The composition of arterioles is not dominated by collagen but by smooth muscle (7, 9), which makes up two thirds of arteriolar wall volume and determines the overall mechanical behavior. Collagen, which typically composes half of the volume of large arteries, has a negligible volume density in arteriolar composition (37). The composition of arteriolar walls has hardly been reported with the exception of the composition of rat cerebral pial arterioles, which have been extensively studied by