Chapter 11: Blood Vessels Flashcards
Large, elastic, muscular vessels; carry blood away from heart and toward tissues
Arteries
Largest artery
Aorta
Small subdivisions of arteries; vessels have muscular
walls that control flow from large arteries into capillaries and regulate blood pressure
Arterioles
How thick of a layer of endothelia lines capillaries?
1 cell thick
Tiny, thin-walled endothelium-lined (one cell thick)
vessels that deliver nutrients, remove waste products, allow
exchanges between blood and body cells (in tissues) or between blood and air (in lungs); connect the arterioles with venules
Capillaries
Small vessels that receive blood from capillaries and
begin to transport it back to heart; join/merge into veins
Venules
What prevents back-flow of blood in veins?
Valves
Which vessels carry 70% of the bodies blood and act as a reservoir in hemorrhaging?
Veins
What interweaves with capillaries and aids in tissue drainage?
lymphatic capillaries
What helps maintain blood flow in the body between heart contractions?
Arteries distend with contraction and snap back during diastole to provide an extra push for blood between contractions.
Compare/contrast arteries and veins.
1) Arteries muscular; veins less so.
2) Arteries under a lot of pressure and distend with systole; veins low pressure, have valves to prevent backflow.
3) Arteries carry O2 rich blood; veins O2 poor (reversed in pulmonary arteries and veins)
What do capillaries exchange with tissues?
1) O2/Co2
2) amino acids
3) glucose
4) water
5) metabolic waste products
What do lymphatic vessels pick up from tissues?
1) ~10% of residual fluids
2) plasma proteins
3) wastes, fats, or insoluble materials
4) debris/pathogens/foreign material
What is the shortest circulatory route in the body?
Coronary Circulation
What is the path of coronary circulation?
1) Aorta
2) R coronary artery and L coronary artery (L splits into the circumflex and anterior descending branches).
3) Heart capillary beds
4) Cardiac veins
5) Coronary sinus
6) R atrium
