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Hondros Bio 254 Exam 1 - Questions & Solutions
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Hondros Bio 254 Exam 1 - Questions & Solutions(Chapter 31) lymphatic system Correct Ans - Jan 2021
What does the lymphatic system do? Correct Ans - Maintains fluid
balance in the internal environment.
-interstitial fluid is absorbed by tissue cells and reabsorbed by the blood
-absorbs fat in the intestine with special lymph structures called lacteals
edema Correct Ans - puffy swelling of tissue from the accumulation of
fluid that can cause tissue distruction
the lymph vessels act as "drains " thats- Correct Ans - collect excess
tissue fluid and > venous blood
lymph Correct Ans - clear, water- appearing fluid found in the
lymphatic vessels.
-This fluid is isotonic
Interstitial Fluid Correct Ans - -fills space between cells
-has a lower protein concentration
lymphatic capillaries Correct Ans - -microscopic
-blind end vessel that are the origin of lymphatic vessels
-lymphatic and blood capillary network work side by side
-lymphatic capillaries merge from the lymphatic vessels and drain into the
lymphatic trunk
what type of cells are lymphatic capillaries made up of? Correct Ans -
flattened endothelial cells (simple Squamous)
lymphatic vessel contains Correct Ans - -thin walls
-valves (these valves are one way)
-lymph nodes
as the lymph flows from thin walled capillaries into vessels with a larger
diameter.. the walls become THINER or Thicker? Correct Ans - thicker-
similar to arteries and veins
,Lymphatic vessel functions Correct Ans - -high molecular weight
substance and even particulate matter from interstitial space
-lacteals absorb fat and other nutrician from the small intestine
-PROTIENS THAT ACCUMULATE IN THE Tissue can only return to the blood
through lymphatics
chyle Correct Ans - milky lymph found in lacteals after digestion
contain 1-2% fat.
Lymph from the upper right quadrant drains into the_______ _______ _________ and
empties into the _____________ vein Correct Ans - right lymphatic duct,
subclavian vein
Lymph for the rest of the body drain into the __________ _________ Correct
Ans - thoracic duct
thoracic duct originates in the Correct Ans - cisterna chyli
where is the cisterna chyli located? Correct Ans - Anterior to the first
two lumbar vertebrae.
How is lymph circulated through the body Correct Ans - through
muscles contraction and relaxation
lymphatic pump Correct Ans - Lymph moves in the right direction due
to the large number of valves
The flow of lymph can be visualized in a ______________ Correct Ans -
Lymphangiogram
lymphatic pump Correct Ans - -inspiration establishes fluid pressure
gradient
-skeletal muscles contractions increase flow
-total volume of lymph depends on depth on inspiration
-lymph enter and return rates very
- depends on the amount of physical activity and other factors
What is the shape of a lymph node? Correct Ans - oval shaped
structure
, where does lymph enter the lymph node. Correct Ans - afferent vessels
-moves slowly through a sinus drain into efferent lymphatic vessel
Lymph nodes act as a biological ___________? Correct Ans - filter
Lymph emerges by one or more ______________ vessles Correct Ans -
efferent
Trabeculae Correct Ans - extend from the capsule toward the center
node
Cortical Nodules Correct Ans - composed of packed lymphocytes
-surrounded by a less dense area
Medullary sinus- Correct Ans - capable of phagocytosis
-lined with cells
Most lymph nodes occur in __________________ Correct Ans - groups
preauricular nodes drain Correct Ans - superficial tissue and skin on
the lateral side of the head and face
mechanical filtration Correct Ans - stops particles form processing
further into the body
Biological filtration Correct Ans - -focuses on biological processes of
cells
-Phagocytosis destroys and removes particles
WBC maturation Correct Ans - lymphoid tissue is the final stage of
maturation
adentitis Correct Ans - infection of the node
tonsils Correct Ans - protect against bacteria that may invade tissues
around the nasal and oral cavities
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