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rida
Forum Guru

Topics: 109
Posts: 721

05/02/04 - 03:17 PM

#1

Which would have highest blood pressure?
A) Aorta
B) R atrium
C) Pulmonary vein
D) Renal vein

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Malaysian
Forum Guru

Topics: 28
Posts: 778

05/02/04 - 03:37 PM

#2

Aorta

rida
Forum Guru

Topics: 109
Posts: 721

05/02/04 - 03:43 PM

#3

Thats what i thought too, but thats not the answer.

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Malaysian
Forum Guru

Topics: 28
Posts: 778

05/02/04 - 03:49 PM

#4

Whoever gets the answer right kindly explain.

rida
Forum Guru

Topics: 109
Posts: 721

05/02/04 - 03:51 PM

#5

This concept is questioned in BRS physio, and the answer they gave didn't make any sense. I won't give out the answer yet because i'll let someone get it and explain to us please.

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Malaysian
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Topics: 28
Posts: 778

05/02/04 - 03:56 PM

#6

Rida my answer is right according to your question.If you are referring to the question given in BRS Physiology the correct answer there was Renal Artery which unfortunately you had not given as an option.

Malaysian
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Topics: 28
Posts: 778

05/02/04 - 03:58 PM

#7

By the way Rida since you're online at the moment could do you knopw how to calculate heart rate on EKG??Could breifly explain on how to calculate it.

rida
Forum Guru

Topics: 109
Posts: 721

05/02/04 - 04:07 PM

#8

Oh your rite, I thought that the whole time when i typed renal vein, i had typed renal artery, sorry malaysian and thanx for pointing it out. Neways, my question therefore will be, why is it renal artery and not aorta? About the heart rate, I did'nt know we had to know that for the boards, but if we do, the only way i can explain it is by visuals, so the best way is this website, does a very good job. Hoe it helps!
http://sprojects.mmi.mcgill.ca/cardiophysio/ekghe...

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"If He takes you to it, He'll take you through it."

Malaysian
Forum Guru

Topics: 28
Posts: 778

05/02/04 - 04:31 PM

#9

Thankx rida.......to those who are lazy in checking the site.....basically the formula is HR=1500/no.of small boxes between R-R waves

Apparently the Renal Artery or for that matter the other systemic arteries branching from below the aorta all have an increased BP above the aorta
because of some wave at their branching point from the aorta causing an increased BP.

Also can anyone eplain this statement 'ACh causes a decrease in the rate of phase-4 depolarization in the SA node by Vagal stimulation'

Idiopathic
Forum Guru

Topics: 19
Posts: 641

05/02/04 - 04:43 PM

#10

"Malaysian" wrote:
Also can anyone eplain this statement 'ACh causes a decrease in the rate of phase-4 depolarization in the SA node by Vagal stimulation'

It decreases the slope of phase 4 depolarization, effectively slowing the heart rate, since it takes longer to reach threshold.

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