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28 Cards in this Set
- Front
- Back
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Describe Blood Vessels 3 Blood Vessel Functions List 3 major types of blood vessels How many miles do the blood vessels in the body make? |
Dynamic not rigid structures Pulsate, constrict and relax arteries, capillaries and veins 60,000 |
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What is the function of arteries? Do they merge or branch? |
carry blood away from the heart arterioles branch |
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What is the function of veins? What are small veins called? |
carry blood toward the heart venules |
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What are capillaries? What occurs here? |
microscopic blood vessels |
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Name the three layers that make up the walls of arteries and veins. What are lumen? |
tunica intima, tunica media, tunica externa central blood-filled space of a vessel capillaries valves
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Which layer of the artery and vein walls is soley composed of endothelium and is continuous with the heart's endocardium? |
tunica intima |
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Which layer of the artery and vein walls is soley connective tissue (collagen fibers) ? |
tunica externa |
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Which layer of the artery and vein walls is circularly arranged to form sheets of smooth muscle? What type of tissues make it up? |
tunica media |
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What two actions occur in the tunica media? |
Contraction – vasoconstriction Relaxation – vasodilation |
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Give 3 examples of MAJOR elastic arteries. Where are the largest arteries? List 3 functions of arteries. |
aorta, pulmonary trunk, and their branches |
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List 6 types of elastic arteries. |
L+R common iliacs |
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What are medium sized arteries referred as? Describe their tunica media. List 2 characteristics. |
distributing arteries contains less elastin, more smooth muscle medium Capable of greatervasoconstriction and vasodilation |
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What are the smallest arteries called? Describe their tunica media List 3 characteristics |
arterioles Has only 1 or 2 layers of smooth muscle cells Capable of the greatestvasoconstriction andvasodilation |
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What are capillaries? |
microscopic blood vessels cornea, lens, epidermis, cartilage |
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What are the most common type of capillaries? Where can they be found? |
Continuous capillaries No interruptions in their walls |
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What type of capillaries have pores in their walls? Where can this type of capillary be found? |
Fenestrated intestines, endocrine glands,kidneys (sites of great secretion orabsorption) |
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Describe sinusoid capillaries Where can this type of capillary be found? |
Discontinuous wall (has holes), larger in diameter in liver,spleen and bone marrow (production orrecycling of blood cells) |
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Capillary bed begin with precapillary sphincters |
to regulate the flow of bloodto tissues according toneed |
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Describe the pressure, lumen, and walls of veins. List 2 vein functions What do veins in the limbs contain? What are venules? What do they do? |
low blood pressure, large lumen, thin walls repository of blood (hold 65% of blood at any given time) valves |
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What is a difference between veins and arteries? |
Veins have larger lumens and thinner walls |
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What helps blood return to the heart through the vein? |
Pressure difference: low pressure between venules and no pressure in right ventricle |
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1. Superior Vena cava |
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Name the 9 arteries that are involved in the upper limb. |
Brachiocephalic trunk Common coratids axillary artery |
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Name the 5 major arteries that supply the brain. |
vertebral artery internal carotid artery common carotid artery subclavian artery Basillar artery |
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In the brain, where does vascular anastomosis occur? Where else in the body does it occur? |
"Circle of Willis" Cerebral Arterial Circle |
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Most veins run withcompanion arteries ofthe same name: What are some exceptions? |
Jugular veins– in theneck: |
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Name the MAJOR 8 veins in systematic circulation |
dural venous sinuses subclavian vein |
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What is the function of dural venous sinuses? |
drain most blood from brain |
