Blood vessel CS part 2 Flashcards
what are part of the cardio system & comprise the portion commonly referred to as the circulatory system
Blood vessels
What are the two sets of blood vessels?
pulmonary and systemic vessels
What. vessel transports blood from L ventricle through body and back to R atrium?
Systemic vessels
What vessel transport blood form R ventricle though lungs and back to L atrium?
Pulmonary Vessels
What are the three main type of vessels that form continuous passageway from heart, body, back to heart?
Arteries, capillaries, Veins.
In blood vessels, internal to outer walls consist of 3 tissue layers, what are they?
Tunica intima/inetrna (inner)
Tunica Media ( middle)
Tunica externa (outer)
The internal layer of Tunica Interna consist of 4 layers, what are they?
- Endothelium
- Basement membrane
- Lamina Propria
- Internal Elastic Membrane
What layer separates Tunica internal from tunica media?
Internal Elastic Membrane
An increase in blood vessel diameter resulting from smooth muscle relaxation
Vasodilation
A decrease in blood vessel diameter, resulting from contraction of these smooth muscles
Vasoconstriction
In tunica media, what increases blood flow through vessels?
Vasodilation
In tunica media, what decreases blood flow through vessels ?
Vasoconstriction
What is the tunica media consist of ?
Smooth muscle and External Elastic membrane.
In what specific muscle does vasoconstriction and vasodilation take place?
Smooth muscle
What tissue is the Tunica Externa made up of ?
Connective tissue
What are the type of arteries?
Elastic, muscular, and arterioles.
A blood leaves ventricles, what are the steps is takes to transition to other arteries?
first travels through elastic arteries, which transition to muscular arteries, then to arterioles.
Which arteries recoil when stretched to prevent blood pressure from falling rapidly?
Elastic arteries because it has a lot of elastic tissue.
which arteries is affected by fluctuations in blood pressure ?
Elastic Arteries.
Which two membranes merge in the elastic arteries?
Internal & external elastic membrane.
What artery wall has meshwork of elastic fibers & interspersed smooth muscle, some collagenous fiber?
Tunica Media
Where is the blood pressure relatively high due to closeness to ventricles ?
Elastic arteries (conduction arteries)
Where can all 3 layers of artery wall can be identified?
The arterioles arteries, smallest
What is the most common type of blood vessel?
Capillaries
Where do the RBCs flow through in single file & are frequently folded?
In smallest capillaries.
What arteries exchanges between blood & interstitial spaces ?
Across thin walls of capillaries.
Capillaries consist of internal layer of tunica intima made of simple squamous epithelial cells called
Endothelium
Scattered fibroblasts, macrophages, un differentiated smooth muscle fibers that are located between basement membrane & endothelial cells
Pericapillary cells
Where can you find pericapillary cells?
Capillaries
What are the 3 types of capillaries ?
Continuous, 7-9um in diamter
fenestrated , 70-100nnm diameter
Sinusoidal, larger than the other
Which capillary has no gaps in the walls between endothelial cells
Continuous Capillaries
What type of capillary is located in muscle nervous tissue & locations?
Continuous Capillaries
Found in tissues where capillaries are highly permeable.
Fenestrated Capillaries
Gaps can exist between endothelial cells in what capillaries?
Sinusoidal Capillaries
What capillary exist in places where large molecules & sometime whole cells move across the capillary wall. Ex) liver, endocrine gland
Sinusoidal Capillaries.
Capillary substances cross capillary walls by diffusing through
endothelial cells and fenestrae
Where does the lipid soluble substances (O2 & CO2) and small, water soluble molecules readily diffuse through the endothelial cells?
Capillary premeability
What must pass through fenestrae or gaps between endothelial cells in the capillary permeability?
Larger water soluble
What can be a possible transport mechanism in the capillary permeability?
Pinocytosis.
Where does capillaries form branching networks in?
Tissues.
What role do arterioles have in capillary nnetwork?
Supply blood
What are metarterioles?
short vessels between arterioles & capillary network
From where does blood flow through thoroughfare channel to a venule ?
From metarterioles
What forms precapillary sphincters?
Branches of capillary bed that have isolated sections of circular smooth muscle.
What regulates the blood in capillary branches ?
Constriction of precapillary sphincters.
What capillaries is closer to arterioles?
Arterial capillaries
What capillary is closer to venules?
Venous Capillaries.
Blood flows into venules, the smallest veins from where?
Capillary network.
In what kind of tissues are capillary networks are more extensive ?
Highly metabolic.
Capillaries in skin assist with what ?
thermoregulation
What allows for exchange of nutrients & waste products ?
Capillaries.
From Capillaries, where does blood flow to next?
Viens