Shared Flashcard Set

Details

anatomy 226
mmyy sseett
21
Anatomy
2nd Grade
08/22/2012

Additional Anatomy Flashcards

 


 

Cards

Term
Conducting Arteries
Definition

many elastic fibers;  incl:  aorta and its branches;  keeps BP constant

 

The biggest arteries.

Term
Distributing Arteries
Definition

 many muscular fibers;  incl:  majority of arteries;  delivers blood to rest of body

 

Delivers blood to specific organs.

Term
Resistance Arteries
Definition
smaller distributing arteries
Term
Arterioles
Definition
contains mostly smooth muscle;  regulates blood delivery and BP;  brings blood to capillaries
Term
Metarterioles
Definition
Link arterioles to capillaries.
Term
Veins
Definition

contain 1-way valves to prevent backflow of blood;capacitance” vessels--blood reservoirs (54% of blood at rest);  irregularly shaped;  thicker tunica externa and thinner tunica media than arteries;  rely on “skeletal muscle pump” for venous return

 

Term
Venule
Definition
smaller, thin-walled vein that connects to a capillary;  very leaky
Term
Varicosity
Definition
Valves become stretched after being dilated for long periods of time
Term
Capillaries
Definition

Simple sqamous epi and basement membrane. "exchange" vessels--brings blood to tissues to exchange O2/CO2 ; Small diameter, scarce in ligaments,tendons, epithelium, cornea, lens of eye, and most cartilage.

 

 

Usually connect arteries (arterioles) to veins (venules)

 

     

 

 

Term
Continuous Capillaries
Definition

 

§epithelial cells are held together with tight junctions with intercellular clefts to allow fluid passage;  abundant in the skin and muscles;  form blood-brain barrier.
Term
Fenestrated Capillaries
Definition

 

epithelium riddled with filtration pores (fenestrations) which increases vessel permeability to solutes and fluid;  found wherever active capillary absorption or filtrate formation occurs (e.g., small intestines, endocrine glands, and kidneys).
Term
Sinusoidal Capillaries (discontinuous capillaries)
Definition
Highly modified, leaky, capillaries with large diameters; found in the liver, bone marrow, lymphoid tissue, and in some endocrine organs
Term
Vascular shunts
Definition

 

metarteriole–thoroughfare channel connecting an arteriole directly with a  postcapillaryvenulebypasses true capillaries.
Term
True capillaries
Definition
10 to 100 per capillary bed, capillaries branch off the metarteriole and return to the thoroughfare channel at the distal end of the bed;  regulated by precapillary sphincter;  blood flow is slow to allow for gas exchange in tissues
Term
Arterial anastomoses
Definition

 

provide alternate pathways (collateral
channels) for blood to reach a given
body region

thoroughfare channels are examples of
arteriovenous anastomoses
 
Term
Laminar Flow
Definition

 

smooth blood flow;  flow is faster in center and slower along vessel wall (encounters friction);  seen in smaller vessels (arterioles).
Term
Turbulent Flow
Definition

 

 

Flow is disrupted due to constriction or vessel curve, "audible"; seen in larger vessels.

 

 

Term
Angiogenesis
Definition
growth of new blood vessels overtime.
Term
Chemoreceptors
Definition
receptors in cartoid arteris & aortic arch detect low oxygen levels to release nitric oxide which dilates vessels to increase blood flow
Term
Vasomotor Tone
Definition

Medulla Oblongata sends SNS impulses to increase vasoconstriction of vessels.

 

Low SNS results in vasodilation

Term
Vasoconstriction
Definition

The narrowing of a vessel.


A rise in epi/norepi, renin, angiotensin II and ADH increase vasoconstriction of vessels.

Supporting users have an ad free experience!