Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892



Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Characteristics of veins and venules are:

a. thick walls.

b. large muscle mass in the walls.

c. a large quantity of elastin in the walls.

d. low blood volume compared with arteries.

e. one-way valves to prevent backflow of blood.

Summary Introduction


The circulatory system consists of a heart, blood vessels, and blood. Blood vessels are important in order to send blood pumped by the heart to different part of the body. These blood vessels comprise arteries and veins that are responsible for carrying oxygenated and deoxygenated blood, respectively.


Justification/explanation for the correct answer:

Option (e) states, to prevent backflow of blood with one-way valves. Veins are the blood vessels that carry deoxygenated blood to the heart. Venules are the small blood vessels that allow blood in the capillaries to drain into a larger blood vessel called veins. Veins run through the muscles and the backflow of blood to the heart is prevented with the help of a skeletal-muscle pump. Muscles when squeezed also squeeze veins that contain one-way valves along with them which results in the flow of blood through these valves. The flow of blood through these valves prevents the backflow of blood. Hence, option (e) is correct.

The explanation for the incorrect answer:

Option (a) states, thick walls. Veins play an important role in carrying the deoxygenated blood back to the heart from the body. The pressure of blood is less in veins because it carries oxygen-deficient blood to the heart and this is the reason behind the thin walls of veins. So, it is an incorrect option.

Option (b) states, large mass of muscles in the walls. Veins are the thin blood vessels that are responsible for carrying deoxygenated blood to the heart for purification...

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