What is vasodilation Vasodilation is the widening of blood vessels or an increase in blood vessel diameter. Vasodilation increases blood flow in the body to

What is a hymen Hymen is a very thin piece of skin-like tissue with a small, circular opening in the center that partly covers the

Urachus Urachus is a tube-like structure that connects the umbilical cord (belly button) to the urinary bladder that is present before birth, which goes away

What is upper motor neuron Upper motor neurons originate in the gray matter of the brain and send long axons which carry the impulses for

What is uterine rupture Uterine rupture is a rare but very dangerous complication in which your uterus tears open along the scar line from a

Urinary urgency Urinary urgency is a symptom of the inability to postpone urination once the sudden, strong need to urinate has been felt. This causes

Tumor suppressor genes Tumor suppressor genes are normal genes that slow down cell division, repair DNA mistakes or tell cells when to die (a process

What is ureaplasma The human Ureaplasma species were first discovered in 1954 in agar cultures of urethral exudates from male patients with nongonococcal urethritis ((The

What is uremia Uremia is a serious clinical condition associated with worsening kidney function and it is characterized by fluid, electrolyte, and hormone imbalances in addition

Upper respiratory infection Upper respiratory tract infection also called "URTI", upper respiratory infection (URI) or “the common cold” is an infection of the nose, sinuses (sinusitis),