Human Phys Lab 8: Vascular Resistance and Starling Forces

Tunica externa

Made up of loose fibrous connective tissue and is seen wrapping around the endothelial layer of the venule

Tunica media

Made up of smooth muscle and is seen wrapping around the endothelial layer of the arteriole

Vascular system

Heart—>Arteries—>Arterioles—>Capillaries—>Venules—>Veins

Vascular resistance

R=8Ln/pir4

Length

L in the vascular resistance equation stands for

Viscosity of the fluid blood

n in the vascular resistance equation stands for

Radius of the vessel

r4 in the vascular resistance equation stands for

Heart attack, stroke, pulmonary embolism

Viscosity of blood is affected by what pathologies

Dehydration and blood doping with erythropoietin

An increase in blood viscosity (n) is characterized by

Muscle, skin, lungs and CNS

Continuous capillaries are seen in

Intestines, kidneys, pancreas, endocrine glands

Fenestrated capillaries are seen in

Liver, spleen bone marrow

Sinusoidal capillaries are seen in

Capillary hydrostatic pressure

Pcap =

Capillary osmotic pressure

Picap =

Net filtration

Pcap > Picap =

Net reabsorption

Picap > Pcap =

(Pcap-Pif) - (Picap-Piif)

The Net Filtration Pressure equation is

35mmHg

HPc at arterial end is

17mmHg

HPc at venous end is

0mmHg

HPif is

26mmHg

OPc is

1mmHg

OPif is

Mathematical Model Tissue Edema

NFP=[(HPc – Hpif) – (Opc – Opif)] – [(HPc – Hpif) - (Opc – Opif)]