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181

A small change in vessel diameter causes enormous change in:

conductance

182

Conductance of a vessel increases in proportion to the _________________________________.

4th power of the diameter

183

What is Poiseuille's law?

F = pie (change) P r^4/ 8nl

184

Poiseuille's law is related to :

laminar flow

185

In Poiseuille's law, diameter plays the greatest role in determining rate of

blood flow

186

In systemic circulation: 2/3 of resistance to flow is ___________________ resistance

arteriole

187

Strong mm walls of arteriole so can change ____________________________. Which can increase blood flow up to __________-fold

diameter up to fourfold
256-fold

188

Viscosity has an inverse relationship to ____________________.

blood flow.

189

Hematocrit =

% of blood that consists of cells

(hematocrit = 40)

190

polycythemia =

many cells in the blood

191

Who has more hematocrit, males or females??

males

192

The theory of circulatory function addresses the needs of tissues that tightly controls blood flow; small-tissue specific vessel dilate or constrict locally to control:

flow in addition to change in cardiac output

193

Cardiac output primarily controlled by:

some of all local tissue flows

194

In general, arterial pressure is controlled independently of:

local blood flow or cardiac output

195

MAP =

DBP + (pp/3)

196

PP (partial pressure) =

SBP - DBP

197

Mean arterial pressure (MAP) =

pressure that propels blood to tissues

198

Pulse pressure (pp) =

affected by SV and compliance of "arterial tree"
(arteriosclerosis affects????)
Difference between SBP and DBP. Normally about 1/3 of SBP.

199

MAP and PP decrease with:

increasing distance from heart

200

Mean pressure ~0mmHg at:

venae CAVAE

201

mean pressure at capillaries =

~17mmHg

202

mean pressure of pulmonary circulation =

~16mmHg

203

What is the difference b/n MAP and Mean pressure?

???

204

What are 3 effects of pressure on blood flow?

1. increases force on blood flowing through vessels
2. distends vessel
3. what are the effects of vessel distension

205

Distension linty: veins ____ arteries

veins > arteries

206

Compliance = capacitance =

total quantity of blood that can be stored in a given portion of the circulation for each mmHg pressure rise

207

compliance = distensibility X :

volume

208

Central venous pressure =

right atrial pressure ~0mmHg

209

venous pressure influences on ____________________

R atrial pressure

210

venous pressure increase or decrease in _______________

R atrial pressure (potential pathology)