Site of increased resistance in isometric muscle contraction.
D000792:Angiography; D000818:Animals; D002196:Capillaries / Q000033:anatomy & histology* / Q000502:physiology; D004285:Dogs; D006940:Hyperemia; D009119:Muscle Contraction / Q000502:physiology*; D009132:Muscles / Q000098:blood supply*; D051381:Rats; D012039:Regional Blood Flow / Q000502:physiology*; D014655:Vascular Resistance / Q000502:physiology*