14-16 14) Compared to blood capillaries, lymphatic capillaries A) are much less
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14-16
14) Compared to blood capillaries, lymphatic capillaries A) are much less permeable B) are smaller in diameter C) have smaller gaps between endothelial cells D) are more permeable E) have a round, regular outline 15) Lymph is transported through a network of increasingly larger lymphatic vessels. What is the correct order of these, from smallest diameter to largest diameter? A) Capillaries - ducts - trunks - vessels B) Ducts - capillaries - vessels - trunks C) Vessels - capillaries - trunks - ducts D) Ducts - vessels - capillaries - trunks E) Capillaries - vessels - trunks_ducts 16) The right lymphatic duct A) carries lymph to the right brachiocephalic veirn C) carries lymph from tissues inferior to the diaphragm D) carries lymph from the head only E) empties into the axillary veinExplanation / Answer
14.D
The lymphatic network originates in tissue spaces as very thin, closed endothelial tubes (lymphatic capillaries). These are analogous to blood capillaries, but are much more permeable, with little resistance to passage. They have no basement membrane.
15. E
Lymphatic system begins with small lymphatic vessels, or lymph capillaries, in the body tissues, and continues with successively larger lymphatic vessels, or collectors and trunks, which ultimately connect to the venous part of the blood circulatory system.
16. B
The right duct drains lymph fluid from:
· the upper right section of the trunk, (right thoracic cavity, via the rightbronchomediastinal trunk),
· the right arm (via the right subclavian trunk),
· and right side of the head and neck (via the right jugular trunk),
· also, in some individuals, the lower lobe of the left lung.
All other sections of the human body are drained by the thoracic duct.
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