Hey, everyone! Sorry for my absence. Too much going on past few weeks. Now in the middle of prepping for a GI exam and realized how much I abandoned this blog! I have more interesting diseases/conditions to post, but lack of time is getting to me. For now, just thought I'd stop by and throw in a little medical school humor. I admit, the above sketches show what it's like in med school, at least most of the time...
Thursday, March 22, 2012
Baby holding breath under water
Man experiencing cold water shock
Hey guys! I learned something very interesting today called the diving reflex. Basically, exposure to cold water around your nose and facial region triggers apnea (cessation of breathing) and bradycardia (slow heart rate). This is a reflex meant to protect us from aspiration of water during the initial stages of drowning. During this time, most of the blood flow is diverted to the brain, heart, and lungs until we resume breathing again.
This phenomenon is what makes babies hold their breaths and open their eyes when they are submerged in water. These babies above look like they know what they're doing under water but I'm sorry to say that it's a natural protective reflex! But they still look cute either way. Ciao until next time.
Pictures courtesy of: enquetemaken.be and Reuters
Tuesday, March 13, 2012
Up until today, I had thought that if I accidentally inhaled or chocked on a small pea or a loose tooth, it would go down my trachea and by chance, it would either end up lodged in my left or right bronchus- with 50-50 chance of its final destination.
Well I was wrong! It turns out, as the left and right bronchi branch into the lungs from the trachea, one is more vertical than the other, and therefore would be the more likely one to receive these unwanted objects... would you like to guess which one?
Hope you had the right answer - The right bronchus descends more vertically and the left bronchus has a more horizontal structure- which means, if you inhale something by accident, it would go down your trachea and have a much greater chance of going straight down into the right bronchi rather than taking that horizontal turn to the left! Gravity is on it's side on its way to the right.
picture courtesy of: healthhype.com
Friday, March 9, 2012
This flower is called digitalis. It's pretty, colorful, looks feminine, and it may save your life if you have heart failure and various other heart conditions. This pretty little thing is used to prepare a drug called digoxin. This medication increases the calcium concentration inside your heart cells (myocytes). Increasing the calcium in your myocytes leads to a greater force of contraction. This can be beneficial in situations where the heart can not produce enough force to pump blood to the rest of your body. And we all know the dangers of not getting enough blood supply to our body, which is also known as ischemia - it leads to tissue death. This can be life threatening.
So my conclusion, for a hurting or failing heart, in reality or figuratively speaking, pink flowers can literally and metaphorically make things feel better.
Picture courtesy of landscapia.info
Friday, March 2, 2012
In split brain syndrome, a callosotomy is performed. In the previous post, I discussed the corpus callosum and how it is the bridge between our two hemispheres. This is a great thing because our two brains can communicate and work together. But in patients with epilepsy, it could be a bad thing because it facilitates the spread of the seizures from one hemisphere to the other. The callosotomy, which is a last resort procedure, interrupts or reduces these spreads of brain activity and therefore, the symptoms of the seizures.
Even though split brain patients are able to lead normal lives, the side effects of this procedure are very interesting because you essentially have two brains not talking to each other or partially ignoring each other. Sometimes, patients speak out loud what they want to communicate to the other side of the brain. Patients are unable to use just the right eye and read something because the speech center is located in the left hemisphere. These are just a couple of examples but each patient is unique and may manifest different side effects.
Picture courtesy of psych.ndsu.nodak.edu
Saturday, February 25, 2012
So I touched on this topic a little on the previous post but I thought I'd expand on it. Our two lovely brain hemispheres are like twins with completely different personalities - this is commonly known as lateralization of brain function. Much research has been done to localize certain behaviors or actions in our brains so I'm not making this up, I promise.
So before I start distinguishing between the two hemis, I want to introduce you to the corpus callosum. It is basically a collection of axons which connect the two different sides of the brain. That's why we can function smoothly and in coordination - because the two sides are in constant communication with each other. If the corpus callosum is dissected, people will have what is called "split-brain" syndrome (I'll post on that next time).
So your left side/hemisphere is the mathematician, statistician, lawyer, linguist, etc. It deals with reasoning, logic, critical thinking, and numbers. Furthermore, it houses Broca's and Wernicke's areas which are our language centers. Wernicke's area is where we interpret and understand what people are saying to us, what we are reading etc. Basically any language input has to go through the wernicke's area for us to understand it. On the other hand, Broca's area is our motor or output center for language. Our language production, whether it be in the form of speech, writing, sign language etc is processed by the Broca's area.
The right side of your Brain is the musician, the artist, the chef, the photographer etc. It houses our imaginative, creative, and expressive side. Colors, images, recognizing faces, intuition, etc are governed by the right side of the brain. I like thinking of our right hemisphere as our wild side because your interpretation of the abstract world or understanding of art can not be defined by formulas or equations.
So there you have it folks. I hope this post was not too long. Believe me, this is as brief as I could be! But I'll leave you with one question: Which one of your hemispheres is dominant?
Picture courtesy of Mercedes
Wednesday, February 22, 2012
So guess what guys? We breath one nostril at a time. Take a minute now to close one nostril and breath through the other and vice-versa. You will notice how one side is much more open than the other. So our body incredibly has a 3-4 hour cycle of switching between the two nostrils. Our tissues on either side will swell up periodically and allow the other side to be the main breather.
It is really interesting because research has shown that depending on which side you are breathing, your brain activity differs as well. Breathing through the right nostril will make the left side of the brain more active. The left side of the brains is the more logical, analytic, calculative, reasoning side. And breathing through the left nostril will make the right side of your brain more active. The right side of your brain is the more creative and imaginative side.
So I learned this a couple of weeks ago and found it so interesting and wanted to share.
And it's kind of crazy because I've also found about about people who purposely block one nostril depending on what side of the brain they want to get more active. I wouldn't recommend that. I think our body knows when to use what side and it will probably facilitate the use of either side when you need it. Well, at least I hope it does.
Ciao till later!
Picture courtesy of yogitobye.com