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The Lymphatic System
lymph, system
47
Anatomy
Undergraduate 1
03/20/2014

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Term
What are the Lymphatic system's two main roles?
Definition
Maintaining blood volume, and housing defensive cells
Term
The Lymphatic system consists of what 2 semi-independent parts?
Definition
Lymph- the fluid
Network of Lymphatic Vessels
Lymph Nodes (and lymphoid tissues/organs)
Term
Lymph
Definition
Interstitial fluid once its entered lymphatic vessels
Term
Lymph flows toward where?
Definition
The heart nigga
Term
How many liters of fluid a day does the lymphatic system move?
Definition
3 Liters
Term
Fluid is filtered by..
Definition
Lymph nodes
Term
what type of system
Definition
One way
Term
What type of valves?
Definition
Flap like mini valve, fluid can't leak back out, has a "blind end"
Term
Lymphatic capillaries are similar to
Definition
blood capillaries
Term
Are Lymphatic capillaries permeable?
Definition
Yes, they are highly permeable
Term
What do lymphatic capillaries pick up?
Definition
Liquid and Proteins
Term
Minivalves
Definition
Loosely joined endothelium, serves as one way "gates" or "flaps"
Term
Lacteals serve what purpose?
Definition
They absorb Chyle
Have fenestrated blood capillaries
Pick up lipids and water, which has a milky appearance
Term
What is Chyle?
Definition
Interstitial fluid mixed with lipids
Term
Lymphatic Trunks, Ducts drain into veins neaar
Definition
The heart NIGGA
Term
Fluid returns to the circulatory system just before where nigga?
Definition
The superior venae cavae NIGQQQKKAAAHHH
Term
Does lymph transport have a pump?
Definition
NO PUMP NIQQKKAAHH
Term
Lymph Transport:
Low or high Pressure
Fast or slow flow?
Definition
Low Pressure, slow flow
Term
What helps lymph move?
4 Mechanisms
Definition
Pulsations of nearby arteries
Contractions of smooth muscle in the walls of the vessels
one way valves
Repertory pump
Term
What are lymphocytes?
Definition
The main cells involved in the immune response
Term
What do T and B cells do?
Definition
anything the body perceives as non self
4 example:
bacteria and their toxins
viruses
mismatched RBCS or cancer cells
Term
what do T cells do?
Definition
Attack and destroy foreign cells
Term
What do B cells do?
Definition
Produce Plasma cells (which secrete antibodies)

Antibodies immobilize antigens
Term
Lymphoid Cells: Macrophages
Definition
Begin life in bone marrow as monocytes
Term
Lymphoid Cells:
Phagocytic
Definition
engulf invaders (whole cells, toxins, ect)
Term
Lymphoid cells: Reticular Cells:
Definition
Produce the fibrous network that supports other cell types in lymphoid organs
Term
Lymphoid cells: Dendritic Cells:
Definition
Antigen Capturing cells
This is a special type of phagocytes
Engulf and digest pathogens
Present Pathogen on surface, so immune cells know what to attack
Term
Lymphoid Tissue:
Scattered diffuse Lymphoid tissue is found..
Definition
In every body organ -- in some its condensed into lymphoid follicles

Usually in connective tissue packed around organs
Term
What are Lymphoid organs?
Definition
Organized lymphoid tissue composed of reticular connective tissue
Term
What are the main roles of lymphoid tissue?
Definition
Houses and provides site of proliferation for lymphocytes

Provides location where lymphocytes and macrophages can "scan" and "filter" the lymph

Provides location for immune surveillance
Term
The principle lymphoid organs of the body are the
Definition
Lymph nodes
Term
Where are the lymph nodes located?
Definition
clustered along lymphatic vessels
Term
what channels flow into the nodes and what channels leave through the nodes
Definition
Afferent, efferent
Term
Slower velocity
Definition
through Lymph
Term
Function of Lymph Nodes
Definition
Filtration - Macrophages destroy microorganisms and debris

Immune system activation - monitor for antigens and mount an attack against them
Term
Characteristics of the spleen
Definition
Highly vascularized
largest lymphoid organ
Sinusoid capillaries work with the spleen
Term
Functions of Spleen
Definition
Cleans blood - gets rid of old blood cells and platelets

storage and recycling of raw materials

Site of lymphocyte proliferation

Immune surveillance and response
Term
What category of organs does the Thymus fall under?
Definition
A lymphoid organ
Term
The thymus is most active at what point of life?
Definition
Adolescence
Term
When does the thymus atrophye?
Definition
As you get older
Term
The thymus secretes hormones that cause
Definition
T cells to become immune competent ( able to attack specific antigens
Term
T cells are primed to identify targets when they pass through the..
Definition
Thymus
Term
The Thymus helps in the maturation of what cells?
Definition
T cells
Term
Lymphoid Organs

Tonsils: what do they do?
Definition
Gather and remove many pathogens entering via food or inhaled air
Term
Lymphoid Organs:

Peyer's patches
Definition
Scan for antigens trying to enter the body across the intestinal mucosa
Term
Infectious disorders of the Lymphatic system?
Definition
Tonsillitis
Lymphangitis
Bubonic plague
Lymphedema
Term
Another disorder of the lymphatic that is not of the infectious nature..
Definition
Lymphatic Filariasis (elephantiasis)
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