Blood pressure is the force per unit area exerted by the blood against a vessel wall and is expressed in millimeters of mercury (mm Hg). Resistance is a measure of the friction between blood and the vessel wall, and arises from three sources: blood viscosity, blood vessel length, and blood vessel diameter.apillaries are the smallest vessels and allow for exchange of substances between the blood and interstitial fluid. Continuous capillaries are most common and allow passage of fluids and small solutes. Fenestrated capillaries are more permeable to fluids and solutes than continuous capillaries.
A House Divided Against Itself Cannot Stand Abraham Lincoln June 1858. Lincoln delivered this famous speech, noted for the phrase a house divided against itself cannot stand, when accepting the Republican nomination for U.S. Senate from Illinois in June of 1858.
Lincoln's House Divided Speech. June 16, 1858, at the Illinois Republican convention. Mr. President and Gentlemen of the Convention: If we could first know where we are and whither we are tending, we could better judge what to do and how to do it. We are now far into the fifth year since a policy was initiated with the avowed object and confident promise of putting an end to slavery agitation.