Podcast
Questions and Answers
What is the main function of arteries in the circulatory system?
What is the main function of arteries in the circulatory system?
- To filter out impurities from the blood
- To regulate blood pressure
- To carry blood away from the heart to the body's cells (correct)
- To carry blood back into the heart
The walls of veins have thicker muscle layers than those of arteries.
The walls of veins have thicker muscle layers than those of arteries.
False (B)
What is the name of the cavity within a blood vessel?
What is the name of the cavity within a blood vessel?
Lumen
The transport system in mammals consists of the heart, blood vessels, and ____________________ vessels.
The transport system in mammals consists of the heart, blood vessels, and ____________________ vessels.
Which type of blood vessel has a wall that is only one cell thick?
Which type of blood vessel has a wall that is only one cell thick?
All transport vessels have some structural features in common.
All transport vessels have some structural features in common.
Match the following blood vessels with their characteristics.
Match the following blood vessels with their characteristics.
The blood in arteries is pumped out of the heart under ____________________ pressure.
The blood in arteries is pumped out of the heart under ____________________ pressure.
What happens when the smooth muscle in the arteries contracts?
What happens when the smooth muscle in the arteries contracts?
The walls of veins have thicker muscle and elastic layers than those of arteries.
The walls of veins have thicker muscle and elastic layers than those of arteries.
What is the main function of valves in veins?
What is the main function of valves in veins?
The walls of capillaries are extremely _________ to allow for efficient diffusion of substances.
The walls of capillaries are extremely _________ to allow for efficient diffusion of substances.
Match the following components of blood vessels with their functions:
Match the following components of blood vessels with their functions:
What happens to the lumen diameter when the smooth muscle in the arteries relaxes?
What happens to the lumen diameter when the smooth muscle in the arteries relaxes?
The lumen diameter of veins is narrower than that of arteries.
The lumen diameter of veins is narrower than that of arteries.
What is the main function of the elastic fibers in the walls of arteries?
What is the main function of the elastic fibers in the walls of arteries?
Study Notes
Blood vessels, with a lumen and wall, are found in the circulatory and lymphatic systems. There are three main types: arteries, capillaries, and veins. Arteries carry blood away from the heart, with thick walls that withstand high blood pressure and elastic fibres that allow them to expand and recoil. Veins carry blood back to the heart with thin walls and valves that prevent backflow. Capillaries are thin vessels that exchange substances between blood and cells, with thin walls and a small lumen that forces red blood cells to pass through in single file.
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Description
Compare the structure and function of arteries, capillaries, and veins in the transport system of mammals, including their role in blood and lymph circulation.
