http://www.valuemd.com/ en Sat, 21 Nov 2009 16:11:09 GMT vBulletin 60 http://static.valuemd.com:81/images/misc/rss.jpg http://www.valuemd.com/ http://www.valuemd.com/physiology-forum/187209-two-questions-about-physiology-lab.html Wed, 18 Nov 2009 17:54:07 GMT Hi In frog muscle tetanization experiment: 1.Why do we see incomplete tetanization then the complete tetanization?:confused: 2. What will happen if we continue stimulating the frog muscle while it is in a complete tetanization?:confused: Thanks in advance

Hi
In frog muscle tetanization experiment:
1.Why do we see incomplete tetanization then the complete tetanization?:confused:
2. What will happen if we continue stimulating the frog muscle while it is in a complete tetanization?:confused:
Thanks in advance ]]> Physiology Forum nafas http://www.valuemd.com/physiology-forum/187209-two-questions-about-physiology-lab.html http://www.valuemd.com/physiology-forum/186774-placebo-effect.html Thu, 12 Nov 2009 02:31:13 GMT

Please put this in the right forum, if this is the wrong one. I'm a skeptical man, not religious nor spiritual. Now, I've heard of the placebo effect. I hear that painful emotions (such as being dumped) that cause 'heart-ache' can actually weaken a heart. Now for example, I have a small cut on my arm. Will it heal faster if I have positive feelings and feel strong of mind and body? And slower if I feel very down, negative and weak? ]]> Physiology Forum kappa http://www.valuemd.com/physiology-forum/186774-placebo-effect.html http://www.valuemd.com/physiology-forum/186345-partial-pressure-gases-various-parts-respiratory-system.html Wed, 04 Nov 2009 17:58:38 GMT

Hello everyone,

Ok to understand the respiratory system, proper understanding of this diagram is essential. Something I don't have, so if anyone can help me with these questions I would be very greatful. Thanks :)

img515@imageshack@us/img515/8923/rightbv@jpg

(replace @ with . )

The colour of blood for arteries and veins is mixed up in the diagram. So excuse that.

1. Anatomic dead space and residual volume?
I know what anatomic dead space is but residual volume is confusing me. Is it in the conducting zone as well and non technically isn't it like some kind of anatomic dead space.

2. Why does the alveoli have less partial pressure of oxygen than inspired air? I can understand how addition of water vapour can reduce it but residual volume just confused me. Does oxygen from residual volume get mixed with this as well increasing P02.

3. Why does the expired air have higher P02 of oxygen than alveoli?
I can understand how mixing with dead space would archieve it. Does the residual volume affect it as well. Residual volume is confusing me.

4. What creates the P02 in arterial blood and why it is 95?
So it is basically oxygen dissolved in blood right that causes the partial pressure of oxygen.We consider the haemoglobin bind oxygen as part of dissolved blood right? 95 is due to shunting right?

5. Why is PC02 in alveoli 40 and what creates PC02 in arterial blood?
Is it 40 in alveoli because CO2 diffuses into it from the capillaries. So C02 from tissues goes to capillarie-->veins--->capillaries---->alveoli so from where does arterial PC02 come from.

Your help would be greatly appreciated. Thanks :) ]]> Physiology Forum sam16231 http://www.valuemd.com/physiology-forum/186345-partial-pressure-gases-various-parts-respiratory-system.html http://www.valuemd.com/physiology-forum/185697-countercurrent-multiplication.html Sat, 24 Oct 2009 09:33:34 GMT 1. Why does less osmolarity in the medulla exist when ADH is decreased in contrast to high ADH? 2. What is the role of urea to maintain the osmolarity in the medulla? 3. What is the role of vasa recta in countercurrent multiplication? THX.:oops:

1. Why does less osmolarity in the medulla exist when ADH is decreased in contrast to high ADH?
2. What is the role of urea to maintain the osmolarity in the medulla?
3. What is the role of vasa recta in countercurrent multiplication?
THX.:oops: ]]> Physiology Forum Obzidan http://www.valuemd.com/physiology-forum/185697-countercurrent-multiplication.html