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Hondros Bio 254 Exam 1 - Questions & Solutions

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Hondros Bio 254 Exam 1 - Questions & Solutions

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  • March 15, 2024
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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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