chpt 15. lymphatic vessels Flashcards
immunity def
ability to ward off the disease/ damage
pathogens def
disease producing microbes
susceptibility def
lack of resistance
lymphatic system function
- drain excess isf
- transport dietary proteins and isf
- immune response in lymph nodes
lymph def
isf in lymph vessels
lymphatic sys components
- lymph
- lymph nodes
- lymphatic vessels
- structures + organs containing lymphocytes
- red bone marrow
immune response components
- t cells
- antibodies produced by B cells
- plasma cells
- antigens
which wbc are 15-30%
b-cells
which wbc are 70-85%
T cells
types of T cells
- t-helped
- t-cytotoxin
- t-regulatory/ suppressor
lacteals function
pick up fats, lipids, triglycerides, vitamins (A, D, K, E)
lacteal location
intestines
chyle def
lymph in lacteals
avascular tissue lacks
lymph capillaires
which tissues lack lymph capillaries
- cartilage
- epidermis
- cornea
- CNS
- portion of speel
- red bone marrow
lymph capillaries structure
- closed at one
- larger diameter than blood capillaries
- greater permeability
lymph capillaries function
- unite to form lymph vessels
- isf can come in
lymph capillaries location
-b/w cells
flow of isf from lymph capillary to venous system
afferent lymphatic vessel lymph node efferent lymphatic vessel lymphatic vessel trunk ducts venous system
trunks
- lumbar trunk
- intestinal trunk
- bronchomediastinal trunk
- subclavian trunk
- jugular trunk
ALL trunks dump into
left thoracic duct
subclavian, bronchomediastinal, juglar trunk dump into
-right lymphatic trunk
what does the right lymphatic trunk dump into?
juglar and subclavian veins
do lymphatic vessels have thinner walls than veins?
yes
what type of vessels have more valves
lymphatic vessels
how much isf turns into lymph per day
3L
thymus location
mediastinum
between sternum and aorta
what structure is the thymus inferior to
cervical region
what structure is the thymus leveled to
4th costal cartilage
size of thymus in children
70g, bigger, since they need more protection
size of thymus in adults
3g, smaller, cuz immune sys is developing
what surrounds the thymus in children
adipose tissue and connection
components of the thymus
- cortex
- medualla
- trabecula
- thymic (hassalls) corpuscle
- capsule
cortex in thymus cells
- immature t-cells
- scattered dendritic cells
- epithelial cells
- macrophages
scattered dendritic cell function
-aid in maturation of t -cells
epithelial cell function
-releases thymosin and aids with maturation of t cells
trabecula function in thymus
-divides thymus into 2 fucntional zone
what is the extension of the capsule in thymus
trabecula
medulla of thymus cells
- mature t cells
- epithelial cells
- macrophages
medulla of thymus function
-clean out any missed lymph
thymic (hassall) corpuscle function and cell
-cause of t cell death
40-50 epithelial kertanized cells
