Nothing, blood vessels are nothing because they wont harm you or anything like that.
No, oxygen does not dilate blood vessels. In fact, oxygen has a vasoconstrictive effect, which means it causes blood vessels to constrict or narrow. This helps regulate blood flow and pressure in the body.
dilate
The term Elastic Arteries usually refers to the ability of blood vessels to dilate and constrict freely.
When body temperature drops below normal, dermal vessels are likely to constrict to maintain core body temperature, limiting heat loss through the skin. In contrast, when body temperature is elevated, the vessels in the dermis are likely to dilate to help the body release excess heat.
Almost all the veins and arteries constrict and dilate during heavy exercise. Even capillaries bring a flush to the face and skin by dilation.
Quite the contrary actually. Smoking will raise blood pressure and dilate vessels. Hope this helps!
dilates them
Blood vessels are surrounded by very small circular muscles which contract and relax to allow blood vessels to constrict and dilate. The vessels also contain elastin which allows them to stretch.
blood vessels. doppus
Changes in barometric pressure can affect blood pressure, especially in individuals who have cardiovascular conditions. When barometric pressure drops, it can cause blood vessels to dilate, leading to lower blood pressure. Conversely, when barometric pressure rises, it can cause blood vessels to constrict, resulting in higher blood pressure.
They don't, narcotics make your pupils dilate.