Chapter 20 Flashcards
Which of the following blood vessels has the thickest tunica media to withstand higher pressures?
Arteries
What type of capillaries are most common and have a complete endothelial lining?
Continuous capillaries
What is the main role of valves in veins?
Prevent back flow in veins
Which pressure drives the movement of fluid out of capillaries into tissues during bulk flow?
Blood hydrostatic pressure
Which type of artery contains a higher percentage of smooth muscle and controls blood distribution?
Muscular arteries
What mechanism allows low-pressure veins to return blood to the heart effectively?
Valves, skeletal muscle pump, and respiratory pump
What type of alternative blood flow pathway connects two capillary beds?
Portal system
What is the primary driving force behind blood flow in the circulatory system?
Pressure gradients
Which of the following factors most significantly affects vascular resistance?
Vessel radius
Mean arterial pressure (MAP) is calculated by:
Diastolic pressure + one-third of pulse pressure
Where are control centers for nervous system regulation of the vascular system located?
Medulla oblongata
