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

How do lymphatic vessels and capillaries differ from other vessels and capillaries in the circulatory system?

a. Lymph capillaries are larger in diameter than bloodcapillaries.

b. Lymph capillary walls contain several layers of endothelialcells, which allows for efficient filtering of lymph.

c. Lymph vessels are only distributed in specific regions of thebody.

d. Movement of lymph does not require skeletal musclemovement.

e. The lymphatic system moves up to 8 L of fluid through thebloodstream daily.

Summary Introduction


Blood vessels and lymph vessels are important parts of the circulatory and lymphatic system. Blood vessels are responsible for carrying blood to different parts of the body. Lymphatic system in the body comprises of lymph vessels and lymph. Lymph vessel is a network of vessels that carry lymph, which is drained into the blood from tissues.


Justification/explanation for the correct answer:

Option (a) states that the diameter of the lymph capillaries is greater than the blood capillaries. Lymphatic capillaries are responsible for collecting the lymph fluid that comes from tissues. Lymph capillaries carry greater oncotic pressure. Oncotic pressure is a kind of osmotic pressure that is induced by proteins in the blood. This displaces the water molecule, creating a water molecule deficit with those water molecules that are moving back into the circulatory system within the capillaries, having low pressure at its end. Oncotic pressure is greater due to the high concentration of plasma proteins present in lymph as compared to the blood capillaries. Hence, option (a) is correct.

Explanation for the incorrect answer:

Option (b) states that the efficient filtration of a lymph is possible due to the presence of several layers of endothelial cells that are present in the walls of lymph capillaries. Lymph present inside the lymph capillaries is filtered due to the movement of fluid from high concentration to low concentration. The high osmotic pressure developed between the blood and the interstitial fluid results in the filtration of the blood.

Endothelial cells, which are present inside the walls of lymph capillaries help in the regulation of substances between the blood and the interstitial fluid continuously...

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