Ch. 20 Review Flashcards
Labe the following structure
What are the three layers of blood vessel walls?
Tunica intima, Tunica media, Tunica externa
What is the smallest of the arteries, thin-walled?
Arterioles
What are the smallest of the blood vessels, and the site of gas exchange between blood and tissue cells?
Capillaries
What are large, thick-walled arteries found near the heart that contain sheets of elastic fibers?
Elastic arteries
Small, thinned walls, porous veins
Venules
Arteries which deliver blood to specific organs: contain the most smooth muscles of the vessels
Muscular arteries
Larger vessels returning blood to the heart
Veins
What is the site where resistance to blood flow is greatest?
Arterioles
What is the site where exchanges of food and gases are made?
Capillaries
What is the site where blood pressure is lowest?
Large veins
What is the site where the velocity of blood flow is fastest?
Large arteries
Site where the resistance to blood flow is greatest
Arterioles
Site where exchanges of food and gases are made
Capillaries
Site where the velocity of blood flow is the slowest
Capillaries
Site where the blood volume is greatest
Large veins
Site where the blood volume is greatest
Large arteries
Site that is the major determinant of peripheral resistance
Arterioles
Label the diagram and answer the questions
Label the capillary bed
The mechanism that during inhalation abdominal pressure increases, squeezing local veins and forcing blood towards the heart and at the same time pressure in the chest decreases and thoracic veins expand speeding blood entry speeding blood entry to the right atrium
Respiratory Pump
What is the mechanism that helps return blood to the heart via the veins that involves skeletal muscle?
Muscular pump
What is the mechanism that helps return blood to the heart that involves pressure changes during breathing?
Respiratory pump
What prevents the backflow of blood in veins?
Venous valves