It's Beyond the Text
Wednesday, March 2, 2011
You Have a Heart Disease... Well, Which One?
Monday, February 28, 2011
The Cardiovascular System: Processes, Experiments, and Results
After the heart dissection, I was able to use the microscope the view cardiac muscle from the heart as well as compare and contrast arteries and veins. Arteries had a thicker membrane than the veins. This is because arteries are the exit source of blood from the heart. The aorta is the largest artery in the entire body because this is where all the blood from the heart is being released and carried throughout the rest of the body. The membrane has to be thicker to be able to withstand all the the pressure that is forced upon its walls. Veins on the other hand are smaller do to the fact that blood is being returned to the heart through them. They do not take on as much force as arteries do.
Above: To the left is an artery and to the right is a vein
------------------------------------
In this experiement, we recorded the normal electrical acvtivity of the heart and then switched the red and green EKG sensors to record the electrical activity of the heart that can occur when a heart undergoes myocardial infarcation (Heat Attack).
After recording the heart beats and anaylzing the data, I found it incredibly difficult to read EKG recordings of various hearts and try to find abnormalties or disorders. With time and practice it would become habit and instinct to recognize any abnormalty. Every heart beat is different, but some hearts miss the QRS complex which means that the electrical impulse sent from the P wave was blocked before it could reach the ventricles. This blockage could be caused by tissue injury from previous injuries or myocardial infarction. Recording the intervals between the contractions within the five step process allows us to detect the heart rate and allows us to see how long the heart is taking to react to the electrical impulses.
-----------------------------
A final activity that was presented in class was the use of stethoscopes and sphygmomanometers (blood pressure measuring device) to listen to the heart beat and record blood pressure. The normal blood pressure rate is 120 / 80. The blood pressure that is being recorded is the force of the blood on the walls of blood vessels, both when the heart is beating (systolic 120) and when the heart is at rest (diastolic 80). Since the normal blood pressure is at 120, the sphygmomanometer is pumped to a pressure of 140. Here the pressure valve will "tick" as the pressure of the blood vessels change with the beating of the heart. Over the years technology has advanced sphygmomanometers making it a fast and efficient process. The first place I have personally witnessed a sphygmomanometer was in the vet clinic when an animal was undergoing surgery and under anesthesia. The blood pressure was kept on a constant watch and the anesthesia was turned up or down according to the blood pressure readings. Such a simple contraption has made huge progress!
Above: Stethoscope and Sphygmomanometer!
Monday, February 7, 2011
Friday, January 14, 2011
Leech Neurophysiology Lab
Hypothesis: With knowledge of the leeches nervous system and small brain, it will be fairly easy to identify the electrical activity of the leech because the ganglia is large and they all will respond to the same stimuli.
Materials: Leech tank, dissection tray, 20% ethanol, dissecting microscope, mircomanipulator probe, forceps, scissors, dissection pins, leech tongs, Oscilloscope
Procedure: Anesthetize and dissect the leech, Remove the innards and observe the ganglion, Cut out the ganglion window, Isolate one ganglion from the others, Cut the ganglion sinus, Probe and identify the ganglion sensory cells using different stimuli (Feather, Probe, and Forceps), fluorescent dye, and UV light.
Results/Conclusions: One ganglion consists of many cells that are stimulated by different or similar stimuli. Since the leech has such a small system, there are five manageable cell types that can be found. (Cell Types N, T, P, R, and X) Each cell or neuron was found by responding to the feather (weak probing), probe (medium probing), and forceps (strong probing). Some of the cell types responded to all three of the stimuli, but some only responded to a couple stimuli and remained unresponsive. The many responses to a single ganglia portrays the immense amount of stimulation that the entire nervous system of the leech undergoes. Although it is a simple nervous system to work with, it is very complex.
Monday, December 13, 2010
Electrical Potential Lab
Monday, November 1, 2010
Bone Fractures
~CLICK ON THE PICTURE TO VIEW THE SHOW~