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Lecture 13

BIO310H5 Lecture Notes - Lecture 13: Tunica Externa, Tunica Media, Stroke VolumePremium

3 pages98 viewsFall 2018

Department
Biology
Course Code
BIO310H5
Professor
Nagham Abdalahad
Lecture
13

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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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