Flashcards in Exam 2 Deck (166)
What circulatory structures acts as a control valve to regulate flow?
Arterioles and pre capillary sphincters
T/F: Pulmonary blood flow=venous return=cardiac output
What 4 histologic materials are vessels made of?
What tissue is most prominant in the aorta?
Elastic, (then fibrous, then smooth muscle)
In a typical artery, what tissue type dominates?
Smooth muscle (then elastic, then fibrous)
What structure is only made of endothelium?
The volume of blood that passes a certain point per unit time is what?
At a given flow, the velocity is ________ to the cross-sectional area of a vessel.
What is the only organ to have flow in excess to the cardiac output (CO)?
Flow is ___ to change in pressure but ____ to resistance.
Proportional to chg P, but inversely proportional to resistance
What is considered the driving force of blood movement.?
Systemic circulation is predominantly a ____circuit? Series, parallel, or series¶llel?
3 advantages of a parallel circuitry?
1. Incr/decr flow to tissues independently
2. Lowers total peripheral resistance (TPR)
3. Oxygen rich blood to every tissue
Slower blood flow is associated with an increase or decrease in blood viscosity?
What increases the flexibility of RBC's?
What is the normal range for hematocrit?
What disorder is associated with less than 38% hematocrit?
T/F: Both EPO and exercise stimulate RBC production
What part of a vessel has the fastest velocity?
The center of the vessel
What is the normal, silent, and efficient type of flow called?
How does Turbulent flow differ from Laminar flow?
Turbulent is less efficient, creates vibrational noise, and is associated with vessel dz
What location in the circulatory system is most likely to have turbulent flow?
If the Reynold's # (R#) is less than 2000 flow is ____, and if the R# is greater than 3000 flow is ___.
What is the only factor that is inversely proportional to Reynold's #: velocity, viscosity, diameter, density
Viscosity, (all others are proportional)
T/F: Broad band Doppler reading is associated with laminar flow
T/F: Fick principal is associated with determination of cardiac output
What is distensibility?
the ability of a vessel to stretch
How is compliance different from distensibility?
Compliance is the ability of a vessel to stretch AND hold volume
Which is more compliant: arteries or veins?
Veins...arteries can't store much blood