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Lecture 13
BIO310H5 Lecture Notes - Lecture 13: Tunica Externa, Tunica Media, Stroke VolumePremium
3 pages109 viewsFall 2018
Department
BiologyCourse Code
BIO310H5Professor
Nagham AbdalahadLecture
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BIO310 Lecture 13 - Part 2
●Contraction of right ventricle faces restriction by lung
●Diastolic is the relaxation of the ventricle
●Blood filling ventricle during diastolic is the EDV
which is ejected, but it wont be
emptying the ventricle, there will be some leftover blood in the system called the ESV
●To calculate cardiac output we need a value known as the stroke volume
○We started from EDV and ESV, the blood within ventricles
○Filled in diastolic volume, then left over
○The stroke volume is diff between EDV and ESV
●Stroke volume is ejected per heartbeat
○We will multiply stroke v by heart rate, which gives us the cardiac output
●Cardiac output is pumped per unit time
●Heart rate is the number of beats you feel, each contraction is one heart beat, giving
one stroke volume
●Capillaries of venus will form a venules
●Many venules will form a tributaries
●Large artery and vein are similar in diameter, however the wall of the large artery is
thicker compared to vein
○We have the tunica adventitia indica, tunica media (elastic fibers for stretch and
recoil), and endothelium
○Arteries under high bp, if not stretchable there will be damage to artery
●Vein
○The tunica media is thin
○No need for stretchy
●Medium sized artery
○Tunica media – many layers of smooth muscles (contraction/relaxation)
○Low bp they will contract to increase peripheral resistance
●Venule
○No smooth muscles
○Large veins have ability to contract and relax, but the not like the arteries
●Passing through capillaries there isn’t 0 pressure
●There is hydrostatic pressure that is in favour in filtration
●Filtration is opposed by colloide (osmotic) pressure
○Pressure developed by presence of proteins in blood
○If hydrostatic pressure win there will be filtration
●Bp (hydrostatic pressure) will decrease from arterial side to venous side
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