Circulatory System Part II Flashcards
conducts blood away from the organs and tissues to the heart
VEINS
Types of Veins:
A. LARGE VEINS
B. SMALL AND MEDIUM VEINS
C. VENULES
Large Veins:
Vena Cava
Pulmonary Veins
Mesenteric Vein
SMALL AND MEDIUM VEINS:
External Jugular Vein
Unnamed and Involved the exchanged of metabolites and diapedesis
VENULES
Three basic layers of veins:
Tunica Intima
Tunica Media
Tunica Adventitia
Three basic layers of veins:
simple squamous (endothelium)
Tunica Intima
Three basic layers of veins:
no internal elastic layer
Tunica Intima
Three basic layers of veins:
subendothelium is lacking
Tunica Intima
Three basic layers of veins:
composed of smooth muscles
Tunica Media
Three basic layers of veins:
thinnest coat
Tunica Media
Three basic layers of veins:
thickest coat
Tunica Adventitia
Three basic layers of veins:
no external elastic layer
Tunica Adventitia
Three basic layers of veins:
Fibroelastic connective tissue and fibers
Tunica Adventitia
Three basic layers of veins:
has vasa vasorum
Tunica Adventitia
What type of endothelial layer is there in capillaries?
single layer of endothelial cells (simple squamous)
exhibits selective permeability by permitting exchange of oxygen and carbon dioxide, nutrients, and waste products between blood and tissues
CAPILLARIES
does not exhibit tunica media and adventitia
CAPILLARIES
diameter ranges from 7-9 um
CAPILLARIES
branch without a change in their diameter
CAPILLARIES
are variable in length, but in general they are approximately 1mm long.
CAPILLARIES
Red blood cells flow through most capillaries in a single pile & are frequently folded as they pass through the smaller-diameter capillaries.
CAPILLARIES
The ______ consists primarily of endothelial cells which rest on a basement membrane. Outside the basement membrane is a delicate layer of loose connective tissue that merges with the connective tissue surrounding the capillary.
capillary wall
Along the length of the capillary are some scattered cells that are closely associated with the endothelial cells. These scattered cells lie between the basement membrane and the endothelial cells and are called _____
pericapillary cells
They are apparently fibroblasts, macrophages, or undifferentiated smooth muscle cells.
pericapillary cells
Types of Capillaries:
A. CONTINUOS (SOMATIC) CAPILLARIES
B. FENESTRATED (VISCERAL) CAPILLARIES
C. SINUSOIDAL CAPILLARIES
Types of Capillaries:
most common
CONTINUOS (SOMATIC) CAPILLARIES
Types of Capillaries:
contains numerous pinocytic vesicles, except in the Central Nervous System
CONTINUOS (SOMATIC) CAPILLARIES
Types of Capillaries:
lack fenestra and have continuous basal lamina
CONTINUOS (SOMATIC) CAPILLARIES
Types of Capillaries:
their walls exhibit no gaps between endothelial cells
CONTINUOS (SOMATIC) CAPILLARIES
Types of Capillaries:
endothelial cells are joined and form an uninterrupted solid lining
CONTINUOS (SOMATIC) CAPILLARIES
Continuous (Somatic) Capillaries is located at:
- nervous tissue
- muscles
- connective tissue
- exocrine glands
- respiratory and skin
Continuous (Somatic) Capillaries is present in:
- tight junctions
- desmosomes
- gap junctions
Types of Capillaries:
characterized by openings or fenestrations (pores)
FENESTRATED (VISCERAL) CAPILLARIES
Types of Capillaries:
Function of this is the rapid exchange of molecules between blood and the tissue
FENESTRATED (VISCERAL) CAPILLARIES
FENESTRATED (VISCERAL) CAPILLARIES is located at:
- choroid plexus
- endocrine
- small intestines
- kidney glomeruli
Types of Capillaries:
are blood vessels that exhibit irregular, tortuous path
SINUSOIDAL CAPILLARIES
Types of Capillaries:
their much wider diameters slow down the flow of blood.
SINUSOIDAL CAPILLARIES
Types of Capillaries:
endothelial cell junctions are rare in _____ and wide gaps exist between individual endothelial cells
SINUSOIDAL CAPILLARIES
Types of Capillaries:
basement membrane underlying the endothelium is either incomplete or absent (so a direct exchange of molecules occurs between blood contents and cells)
SINUSOIDAL CAPILLARIES
SINUSOIDAL CAPILLARIES is located at:
- Liver
- Spleen
- Bone marrow
LYMPHATIC VASCULAR SYSTEM is Consists of:
- Lymph Capillaries
- Lymph Vessels
To allow greater permeability, the endothelium in ________ is extremely thin.
lymph capillaries and vessels
The structure of _______is similar to that of veins except that their walls are much thinner.
larger lymphatic vessels
_____ contain more valves to prevent a backflow of collected lymph.
Lymph vessels
________ in the lymphatic vessels is similar to that of blood movement; that is, the contractions of surrounding skeletal muscles force the lymph to move forward
Lymph movement
found in all tissues except the CNS, cartilage, bone and bone marrow, thymus, placenta, and teeth
LYMPHATIC VASCULAR SYSTEM
