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A&P II - Lymphatic System & Immunity questions with correct answers
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A&P II - Lymphatic System & Immunity questions with correct answers
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A&P II - Lymphatic System & Immunity questionswith correct answers
Lymphatic System Correct Answer-Consists of a fluid called lymph,
vessels called lymphatic vessels that transport the lymph, a number of
structures and organs containing lymphatic tissue, and red bone marrow.
Assist in circulating body fluids and helps defend the body against
disease-causing agents
Distinguish between interstitial fluid and lymph Correct Answer-
INTERSTITIAL FLUID: The fluid that surrounds the cells of body
tissues.
LYMPH: Once interstitial fluid passes into lymphatic vessels, it is now
called lymph.
Describe the composition of lymphatic tissue Correct Answer-A
specialized form of reticular connective tissue that contains large
numbers of lymphocytes.
Lymphatic vessels Correct Answer-Lymphatic capillaries unite to form
larger lymphatic vessels
Lymph nodes Correct Answer-At intervals along the lymphatic vessels,
lymph flows through lymph nodes: encapsulated bean-shaped organs
consisting of masses of B cells and T cells.
,Functions of the lymphatic system Correct Answer-1) 85% of the
plasma filtered into the interstitial fluid during capillary exchange is
reabsorbed into capillaries. The remaining 15% in the INTERSTITIAL
FLUID IS DRAINED BY THE LYMPHATIC SYSTEM AND
RETURNED TO THE BLOOD.
• Lymph also returns leaked plasma proteins to blood.
2) The lymphatic system contains lymphatic tissue that PARTICIPATES
IN IMMUNE RESPONSES.
3) The lymphatic system TRANSPORTS DIETARY LIPIDS and lipid-
soluble vitamins absorbed in the gastrointestinal tract.
Structure of the lymphatic system Correct Answer-FLUID: Lymph
• Location is the difference between interstitial fluid and lymph
VESSELS: Lymphatic capillaries and vessels
• Lymphatic vessels resemble veins but have many more valves
TISSUE: Lymphatic tissue
• Specialized form of reticular loose CT with many lymphocytes
ORGANS: Red bone marrow, thymus, spleen, lymph nodes, lymphatic
follicles
,Lymphatic Structure [Image] Correct Answer-
Lymphatic Drainage [image] Correct Answer-
Describe lymphatic capillaries Correct Answer-High permeability
(greater than blood capillaries) allows them to absorb large molecules,
including proteins and lipids.
Overlapping edges of endothelial cells permits flow of interstitial fluid
into, but not out, of them:
• Pressure interstitial fluid > lymphatic caps
= edges of endothelial cells separate slightly
• Pressure lymphatic caps > interstitial fluid
= edges of endothelial cells adhere more closely
In other words:
When pressure is greater in the interstitial fluid than in lymph, the cells
separate slightly, and interstitial fluid enters the lymphatic capillary.
When pressure is greater inside the lymphatic capillary, the cells adhere
more closely, and lymph cannot escape back into interstitial fluid.
, LACTEALS: Located in the small intestine; Specialized lymphatic
capillaries that absorb dietary lipids, transfer them to lymphatic vessels,
and into the blood.
Lymphatic Capillaries [image] Correct Answer-
Flow of lymph Correct Answer-Leaked fluid and proteins are returned to
the blood through the lymphatic system
Valves in lymphatic vessels ensure one-way movement of lymph
Lymph drains back into venous blood (brachiocephalic veins) through
either the:
• THORACIC DUCT
-Main pathway, and begins at the cisterna chyli.
-Receives lymph from left upper limb, left side of the head, neck +
chest, + entire body inferior to the ribs
• RIGHT LYMPHATIC DUCTS:
-Receives lymph from the right upper limb + right side of the head, neck
and chest
Describe the sequence of lymphatic structures a drop of lymph
encounters from the time it leaves the interstitial spaces until it reaches
venous blood Correct Answer-Right Side:
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