So, i am guessing we've all registered for our classes for next semester...i wanted to start a thread where everyone taking the course can come together to ask questions they need help with or just vent or LOL....watever the case may be...so if you are taking A&P 1 in the spring...introduce your self...
a. How many credits you are taking next semester
b. What part of A&P 1 you are looking forward to, are you nervous?
c. How long you have to apply?
d. Some random thing about you?
Lets gooooooo................
Check this thread for some amazing notes by a member.... Polka-dot.(You Rock!!)...for notes on A&P....and welcome to anatomy heaven...:)
Lab Practicals in AP I were HARD. Seventy (70) stations set up...microscopes, models, etc.)...a bell rang every minute and you moved to a new station and answered the question (identify, name function, etc). At the end you had 5 minutes to look at anything you weren't sure of. I studied and studied and studied; went to open labs; worked with classmates and it was still hard. I did get a B in the class; I really don't think I could of done anything else to get a higher grade...much to my dismay. I have AP II now (a MUCH better instructor) so I'm hoping things will be a bit easier???? since I understand what is expected. Oh yes, I forgot to add, everything had to be spelled correctly or points were taken off.
I have my first exam this week on wed and my first lab exam on friday. I am having a hard time understanding osmosis. Why would it be bad to practice intramuscular injections on yourself using distilled water? Is this a hypertonic or hypotonic solution? what would happen if you injected it into a vein?
I have my first exam this week on wed and my first lab exam on friday. I am having a hard time understanding osmosis. Why would it be bad to practice intramuscular injections on yourself using distilled water? Is this a hypertonic or hypotonic solution? what would happen if you injected it into a vein?
In order to understand osmosis you need to understand diffusion. Osmosis is the diffusion of water across a semi permeable membrane. Molecules (Solutes) within the cell are intracellular and molecules outside the cell are solutes in the extracelluar membrane. Certain solutes can not pass the semi permeable plasma membrane but water (H2O) can so then we are talking osmosis. Do to chemistry there is a tendency for molecules to seek an equilibrium between membranes. If a solution outside the cell has many many molecules compared to what is in the cell, the water in the cell being a giver that it is will give up some of it's water i attempt to dilute the solution outside the cell or the ECF. This is a good time to address your second part of your question.
Knowing the above. Distilled water has very little solutes in it, that is extra molecules aside from H2O. Now Hypo or Hyper, lets look at the latin root of these two words. Hyper means more Hypo means less and this refers to solute. So injecting Distilled water in your blood would dilute you blood making water to solute higher. This is a hypotonic solution and thinking about what I said above, the hypotonic solution will try to enter the cell causing it to swell and possibly burst. Of course homeostatic measures would be taken by the body to protect the cells.
Did that make sense, harder to explain without drawing diagrams.
In the muscle, the capillaries would take in the water, I suppose they might swell, the plasma would then be diluted a bit, but other physiological processes in the body would compensate through homeostatic conditions-see hypothalamus. Not sure why it would hurt other than edema. I am just a pre-nurse student as well, so I can be wrong from time to time :) Hope that helps.
Just a quick post. My professor gave me the following link to help us study for our 1st practical. I have it first thing in the morning! Hope this site helps!
oh, that is awesome. We had our first practical today and our lab is so mysterious. Ofcoorifice we had no idea what to expect. They had us look at pictures of different cells and asked us questions. Some of the pics were really bad.(looked like copies run off) I cant believe how lazy they are to not take the time to give us a good picture to look at. They could have used the same pictures as in our histology book.
fairynerdmom, like michaelxy wrote, distilled water is hypotonic compared to cell cytoplasm, so when injected into muscle, muscle cells in the immediate vicinity of the injection site will burst = tissue damage = ouch! likewise, in the vein, rbcs nearby will burst. i was kind of curious to find out how bad it would hurt to inject distilled water into your muscle and came across this cool paper about pain associated with injecting hyper- and hypotonic fluids into muscle: http://jap.physiology.org/cgi/content/abstract/17/5/841.
One trick I found to help me with lab practicals was to find images similar to those shown in the lab and I would make power point slides with just the images, with answers on a key or such. Then before the exam I would just play the slides over and over until I could get them all correct, I always did well with this technique. One problem is when my image looked nothing like on the exam. Well, that is just how I did it.
Sart45
149 Posts
Lab Practicals in AP I were HARD. Seventy (70) stations set up...microscopes, models, etc.)...a bell rang every minute and you moved to a new station and answered the question (identify, name function, etc). At the end you had 5 minutes to look at anything you weren't sure of. I studied and studied and studied; went to open labs; worked with classmates and it was still hard. I did get a B in the class; I really don't think I could of done anything else to get a higher grade...much to my dismay. I have AP II now (a MUCH better instructor) so I'm hoping things will be a bit easier???? since I understand what is expected. Oh yes, I forgot to add, everything had to be spelled correctly or points were taken off.