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Anatomy
Vessels and circulation
22
Anatomy
Undergraduate 2
12/09/2009

Additional Anatomy Flashcards

 


 

Cards

Term

 

Capillary Beds


 

Definition

Branch into smaller & smaller 2 b arteriels

            Hve capillary sphincter = wherether

            If vasodilation takes place

            If vasoconstriction takes place

Term

Capillaries dont hve _______

b/c it would get in the way of diffusion

Definition
tunics
Term

 

Walls of arteries & veins hve three layers called tunics.  From outer to inner:

 

Tunics surround the _____ of the vessel

 

Definition

Tunica externa

Tunica media

Tunica intima

 

 

"Lumen" or inside space

Term
Tunica externa 
Definition

AKA(adventitia)

outer layer

 

Aerolar CT ~ Elastic & Collagen fibers anchor it 2 other organs

 

Vasa vasorum =filtrates wall of large vessels, runs thru this tunic

 

♥Requires its own supply of oxygen♥

 

Term
Tunica media
Definition

"Circularly arranged smooth muscles"

 

Deals w/ thermoregulation

Muscles dilate or constrict when warm or cold

Term
Tunica intima
Definition

(interna)

 

Composed of an endothelium

specifically:

 

Simple squamous epi

Underlying layer of Aeriolar CT (basement memb)

 

[image]Extensions of it forms the valves we see in veins[image]

Term
Vasoconstriction
Definition

Takes place in arterioles

Decreases blood flow into the capillaries

Increase Blood Pressure

 

Blood vessels move closer to interior

Reduces heat loss thru the skin

[image]

b/c person is COLD

Term
Vasodilation
Definition

Takes place in arterioles

Increases blood flow into the capillaries

Decreases Blood Pressure

b/c more space 4 Blood flow

 

 

Blood vessels move closer to exterior

Gets rid of excess heat

[image]

to cool u off

Term
Vein _______ tunica media, than Arteries.
Definition
thinner
Term
Vein ________ tunica intima than arteries
Definition
thicker
Term
Arteries have ____ tunic intima than Veins.
Definition
Thinner
Term
Arteries hve _______ tunica media than Veins
Definition
Thicker
Term
Lumen in Arteries is _____ than in Veins
Definition

Narrower than vein lumen

 

b/c of thicker artery walls

Term
Lumen in veins is _____ than in arteries
Definition

Wider than artery lumen

 

b/c of Thinner vein walls

 

Has collapsed appearance when cut in cross section

Term

????

Valves of heart r extensions of _______ layer

Definition
pericardial layer
Term
Capillaries
Definition

Not soo many tunics

would get in way of diffusion

thin wall & narrow vessel diameter good 4 Diffusion

 

has a

Basement membrane

Tunica intima

 

Term

Tunica intima

CPS

question

Definition

Only layer in capillaries

Continous w/ valves in veins

 

Continous w/ endocardium b/c it slides right on into the heart

Term

Tunica media

CPS question

 

Definition
Responsible 4 vasoconstriction /vasodilation
Term

Fetal circulation

 

list steps

Definition

No functioning lungs or liver soo has bypasses thru these organs

 

Ductus arteriosus

 

Aorta

 

Left ventricle

 

Left atrium

 

Foramen ovale

2 bypass lungs

 

Enters Right atrium

 

Empties into IVC (mix of oxy rich/poor B) 

[b/c IVC carries oxy poor B]

 

Ductus venosus

2 bypass liver

 

Umbilicus

 

Umbilical vein (oxy rich blood)

Vessel that carries blood from the Placenta

 

Term
Umbilical vein becomes ___ in baby
Definition

Round ligament of liver

(ligamentum teres hepatis)

Term
Umbilical arteries becomes ___ in baby
Definition
Medial umbilical ligaments
Term
Review Systematic & Pulmonary Circulation
Definition
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