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Arteries and Veins

What is the job of the heart?

serves a pump

What is the job of arteries and vein?

delivery system

What is the job of capillaries?

exchange of substances

Which allow blood to leave the heart?
arteries or veins

arteries

Which allow blood to return to the heart?
arteries or veins

veins

Which have higher BP?
arteries or veins

arteries

1. Which store/carry more of the body's total blood volume?
(arteries or veins)
2. About how much more?

1. veins
2. 5x

which have valves? arteries or veins

veins (one way valves)

which tend to have bigger lumens?
arteries or veins

veins

which has more muscle in its wall?
arteries or veins

arteries

Name the layers of a blood vessel?

1. Tunica- cell layer of cells
2. Tunica Media- a layer of muscle
3. Tunica externa- a fibrous covering

large blood vessels have their own blood vessels to supply their thick tunica media. what are they called?

vaso vasorum

vasospasm

blood vessels spasm which leads to vasoconstriction

describe the pathogenesis(series of events) which occurs in a heart attack.

1. physical presence of soft plaque which get larger + larger
2. presence rough scratchy plaque that may cause a blood clot to form which blocks a coronary artery
3. irritating substance in the plaque may result in vasoconstriction

ischemia

lack of oxygen

infarction

tissue death

what is a stroke?

cerebrovascular accident(CVA)-sudden death of brain tissue caused by ischemia

what two types of pathology my produce a stroke?

1. thrombus/embolus
2. aneurism

what is an aneurism?

a weak area in the blood vessel which can ballon and rupture

how does the configuration of the Circle of Willis help protect against Stokes?

because of collateral circulation-take a detour

if a stroke can be caused by the occlusion of a vessel or aneurism, in which of these situations would you treat the patient with anticoagulants and clot dissolving drugs

1. occlusion of a vessel- clot dissolving drugs
2. aneurism-anticoagulants

1.In which situation would it be a life threatening mistake to give anticoagulants? occlusion of a vessel or aneurism. 2. Why?

1. occlusion of a artery
2. the vessel is calcified and probably formed a clot, so to give a patient an aticoagulant which help to clot your blood will be deadly

name the structures in the circulatory system body which are responsible for virtually all exchange.

capillaries

when blood sits, blood

clots

name the tiny arteries that supply the capillaries

arterioles

what structures control blood flow into capillaries

pre-capillary sphincters

at rest, approximately what percentage of capillaries are being used?

10 %

terms for spaces in the body

1. intervascular
2. intracellular
3. interstital

intravascular

the space inside a vessel. anything lying within a blood vessel...ex: water inside an artery, vein or capillary

intracellular

anything which dwells inside the cell....ex: Hgb inside a red blood cell, water inside a cell

interstital

anything lying between a cell and a blood vessel..ex: when fluid leaves a capilllary and flows into surrounding tisue it is said to flow from an intravascular space into the interstital space or tissue

what is blood pressure

pressure exerted by the flowing of blood

if a blood pressure is 140/65, what is the systolic pressure?

140

what is hypertension

high BP resting systolic above 140

what is hypotension

low BP systolicpressure below 60

blood pressure is influence by

1. force of the heart- strength of your hear...ex: obesity
2. volume of blood-how much blood in your heart..ex: low BP decrease blood flow to the heart

define shock

extremely low BP/life threatening

cardiogenic shock

heart failure, heart too weak to maintain pressure

What is hypovolemic shock

blood loss and severe dehydration, no enough blood in the veins

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