ANP 1105 Lecture Notes - Lecture 11: Nephron, Vascular Smooth Muscle, Oncotic Pressure

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For a single blood vessel: (p -p )= f x r. P2= venous pressure (vena cava) (p -p ) = ap. Ap = sv x hr x pr. Blood pressure = cardiac output = peripheral resistance. Main factors that influence blood pressure include: Heart rate (hr: nervous and hormonal factors) Systolic volume (sv: venous return, nervous hormonal factors) The diameter of the vessels (nervous and hormonal factors) Affects the venous return (amount of blood returning to the heart) Increases in blood volume, increases venous return, increase preload, increases sv* Maintain an adequate map (mean arterial pressure) Altering blood vessel diameter on a moment to moment basis. Distribute blood in response to specific needs of the organs. Neural controls operate via reflex arcs that involve. Consists of the cardiac centers and the vasomotor centers (controls the diameters of the blood vessels) The vasomotor center transmits impulses at a very steady rate along sympathetic efferents called vasomotor fibers.

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