29 terms

Lymphatic System

BISC 228 Lab Report 42
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Lymphatic pathways begin as ____ that merge to form lymphatic vessels.
lymphatic capillaries
The wall of a lymphatic capillary consists of a single layer of ____.
squamous epithelial
Once tissue (interstitial) fluid is inside a lymphatic capillary, the fluid is called ____.
lymph
Lymphatic vessels have walls similar to those of ____ but thinner.
veins
Lymphatic vessels contain ____ that help prevent the backflow of lymph.
semilunar valves
Lymphatic vessels usually lead to lymph ____ that filter the fluid being transported.
nodes
The lymphatic trunk that drains the abdominal viscera is called the ____ trunk.
intestinal
The lymphatic trunk that drains the head and neck is called the ____ trunk.
jugular
The ____ is the larger and longer of the two lymphatic collecting ducts.
thoracic duct
Lymph nodes contain large numbers of white blood cells called ____ and macrophages that fight invading microorganisms.
lymphocytes
The intended region where blood vessels and nerves join a lymph node is called the ____.
hilum
____ that contain germinal centers the structural units of a lymph node.
Lymph nodules
The spaces within a lymph node are called ____ through which lymph circulates.
lymphsinuses
Lymph enters a node through an ____ lymphatic vessel.
afferent
The partially encapsulated lymph nodes in the pharynx are called ____.
tonsils
The aggregations of lymph nodules found within the mucosal lining of the small intestine are called ____.
Peyer's patches
The lymph nodes in the cervical region are associated with the lymphatic vessels that drain the ____.
skin, face, nasal cavity, and pharynx
The lymph nodes associated with the lymphatic vessels that drain the lower limbs are located in the ____ region.
inguinal
The thymus is located in the ____, anterior to the aortic arch.
mediastinum
The thymus reaches its greatest size during infancy and early childhood and tens to decrease in size following ____.
puberty
As a person ages, the thymus tissue is often replaced by ____.
adipose and connective tissues
The lymphocytes of the thymus develop from precursor cells that originated in the ____.
bone marrow
The hormones secreted by the thymus are called ____.
thymosins
The ____ is the largest of the lymphatic organs.
spleen
Blood vessels enter the spleen through the region called the ____.
hilum
The sinuses within the spleen contain ____.
blood
The tiny islands (nodules) of tissue within the spleen that contain many lymphocytes constitute the ____ pulp.
white
The ____ pulp of the spleen contains large numbers of red blood cells, lymphocytes, and macrophages.
red
____ within the spleen engulf and destroy foreign particles and cellular debris.
Macrophages
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