Chapter 20: Blood Vessels Flashcards
3 layers of a blood vessels
Intima
Media
Externa
What feature distinguish an artery from a vein
Arteries carry oxygenated blood away from the heart to the body
Veins carry oxygen-poor blood back from the body to the heart.
What is a major determinant of the vascular resistance to blood flow and required blood pressure
Variable diameter of arterioles
- arteriole diameter is regulated by both local tissue metabolic signals and the sympathetic nervous system (vasoconstriction)
T or F: capillaries are only one endothelial cell thick but have a variety of site specific functions in the body
True
3 basic types of capillary
Continuous
Fenestrated
Sinusoidal
The capillary beds with _____ and _____ form the microcirculation
Metarterioles; precapillary sphincter
which 3 vessels directly branch off from the aortic arch
- Brachiocephalic trunk
- Left common carotid
- Left subclavian
Sequence of arteries that trace flow from the subclavian to the digital
Subclavian - axillary - brachial - radial - palmer arch
Anastomosis
a cross-connection between adjacent channels, tubes, fibers, or other parts of a network
- Both arteries and veins can demonstrate this connection
what are the main branches off the abdominal aorta
Celiac trunk
Superior mesenteric
Renal
Inferior mesenteric arteries
T or F: the names of veins tend to parallel the names for companion arteries
True
The _____ system: 2 capillary beds in series from intestinal absorption through the liver before blood returns to the inferior vena cava
hepatic
T or F: Deep vein of the lower limb is the source of blood clots, venous thrombosis that can detach and become emboli that can block the pulmonary artery
True
