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44 terms

2.2 Blood Vessels

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pulmonary
1 Blood vessels from R heart to lungs to L heart form the __________ circulation
systemic
2 Blood vessels from L heart to body to R heart form the __________ circulation
arteries
Blood vessels that carry blood away from the heart are ________
Pulse
When you can feel the wall of an artery stretch and rebound as blood goes through it you are feeling your ____.
arterioles
When an artery branches into smaller vessels we call them ____,
capillaries
Blood makes a U-turn in tiny vessels found between arterioles & venules. These vessels are called _________
thin
Capillaries walls are extremely _____ to allow materials enter or leave the bloodstream.
exchange
This makes capillaries the _______ sites for the blood
venules
Capillaries combine into small vessels called _______ (little vein) that start blood on its way back to the heart.
veins
Blood vessels that carry blood into the heart are_________________
valves
Flaps inside a tube carrying liquid which keep the liquid moving in one direction are called ______________
backflow
The purpose of valves in the veins is to prevent _______ of blood
tunica externa
This is the outermost layer of blood vessel walls. It is mostly dense collagenous connective tissue and contains the vasa vasorum. It is usually between half and a third as thick as the tunica media in arteries. TOUGH, for support.
tunica media
This is the name for the third layer from the lumen of blood vessels. It is primarily smooth muscle cells and is much thicker in arteries (about 40 cells in most arteries) than in veins (about 2 to 3 cells in most veins). The veins can have thinner walls because they typically experience less pressure. Contracting, ACTIVE.
Tunica Interna
-simple squamous epithelium (endothelium) LINING inside of vessels
-provides a smooth surface (prevents blood clotting)
-secretes substances (inhibit platelet aggregation and dilate or contract bv)
Tunica Interna
The one layer occurring in all Blood Vessels
Tunica Interna
Forms Capillaries
Pressure from heart
reason why arteries are usually larger and more layered than Vein
Elasticity
quality of artery that helps blood pressure and flow through body
Athlerosclerosis
A slow, progressive condition where arteries narrow from fat and cholesterol

The deposits HARDEN ,causing plaque

Plaque can break off and clog an artery leading to heart attack or stroke
Tunica Media
layer of arteries that are thicker in areas/organs that are more active or need regulation of activity, like the brain.
tension
blood pressure is maintained by _____ in the arteries.
gates
arterioles are also known as capillary ______for their control of blood flow into the capillaries
Fenestrated
____________ capillaries are found in endocrine glands and sites of fluid and metabolite absorption, like the gall bladder and intestinal tract. Smaller LEAK spaces.
Continuous
typical capillary with some paracellular transport between cells, but not enough space to allow blood cells or plasma proteins to exit the vessel; specialized continuous capillaries in the brain are characterized by tight juntions which prevent paracellular transport into the interstitial fluid of the brain. (blood/brain barrier) and also complete tubes
venules
contains little tunica media, smallest veins
Valves
One way openings in veins that allow movement towards the heart.
blood-brain
Continuous capillaries act as a boundary known as the ____-____ barrier
16-20
The heart and pulmonary circuit contain approximately __-
__% of the blood
5
The capillaries contain about __% of the blood
pressure
The lack of ________ in veins is made up for by the large quantity of venous blood.
4
(both blanks are the same number) The enormity of the amount of venous blood provides a huge pool for the arteries to draw on. Blood can return ___ times more slowly in the veins as compared to the arteries since there is ___ times as much volume in the veins.
backwards
The valves make any gain in venous blood flow permanent. Blood cannot flow _______ . Every pressure from skeletal muscles and other tissues forces the blood closer to the heart.
semilunar
The valves in the veins are like the _______ valves of the heart. They are pocket style valves that point in the
direction of expected flow.
flex
The ____-ibility of the vein's walls and the valves of the veins are structures that naturally aid blood flow in the veins.
Veins
______ are loose, flexible vessels purposefully. Their relaxed structure is capable of being squeezed by the skeletal muscles of the body and the pressure of tissues around them generates excess pressure to force the blood along.
breathing
(all blanks are the same one word)

The physical act of ________ aids in venous return The contraction of the _______ muscles enlarges the thoracic cavity lowering the pressure within and drawing
air into the bronchial passages. Not only does the pressure drop draw air into the _________ passages, it also draws blood into the large veins near the heart. The very act
of ______, coupled with the reservoir of venous blood, the valves, and flexible tubes aids in venous circulation back to the heart
Breathing, Reservoir, Valves, Flexible
The very act of ______,
coupled with the _______ of venous blood,
the ______, and _______ tubes aids in venous circulation back to the heart.
smooth
(all blanks are the same one word)

More elastic tissue will give the blood vessel more flexibility. More ______ muscle will influence the internal diameter of the tube. The brain can control blood flow to certain tissues by opening or closing the blood vessels using the contraction of the _____ muscle in the tunica media.
tunica media
In larger blood vessels, the _____ _____ can be so thick that it is necessary for the blood vessel to have its own blood vessels providing for the needs of these deep layers.
Trouble
The body gets in ____ if more than one tissue needs large amounts of blood.
Veins
(both blanks are same one word!)

Venules are the smallest ______. _____ contain very little TUNICA MEDIA
Elastic, Muscular and Arterioles
The 3 types of arteries are: E____, M____, A____
tension
Blood pressure is maintained by ______ in the arteries

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