Virtual Cardiology Lab, EKG, Etc

Cow Heart

Over the past few weeks we have been learning about the heart and our cardiovascular system. This post is going to be combining several labs and a dissection. To start with we did a dissection of a cow, sheep, and pig heart. We cut down the middle of the heart and made it to where the ventricles and atrium's were visible on both sides. Then we started to take measurements of pretty much all of the main parts of the heart and found most of them to be relatively the same. The cow heart was pretty huge and dwarfed the sheep heart, which was mainly covered by fat. The heart to the left is a cow heart and was a really good example of how they showed all of the ventricles, atrium's, and the arteries and veins. So that is a pretty basic overview of what our lab was, the most consistent thing in our lab was that the left ventricle walls were the thickest in the heart. Here is a graph to show all 10 of the measurements we took on the three hearts.

Click on the Graph to Enlarge

Andrew

Andrew Reversed

The next lab we did was on our heart beat, pulse, and blood pressure. We experimented with the older equipment first to try and get this data, but found that neither of us were really good enough to listen for a heart beat with a stethoscope. So then we used the newer blood pressure cuffs that pretty much did all of the hard stuff for us and gave us our information. The graphs are our heart beat over a time span of 5 seconds. We found most of them to be relatively similar with the dips and jumps, also called (p,q,r,s,t). The graphs to the left are our data that we collected on a different pulse experiment. We actually didn't record any of our data on cuffs. But they probably would have showed the same relative heart beat as this graph does. To do this lab we hooked up to a machine with 3 wires going to us, red, green, and a black one that acted as a ground wire. When it says our name and then reversed at the end it is just when we switched the green and red wires around and gave us our heart beat upside down. The EKG, also known as an Electrocardiography machine gathers its data by monitoring the electrical activity of the heart over time. This is usually gathered by probes placed on the skin that picks up electrodes on the skin and amplifies them to a certain extent and thus gives us the EKG readings on the machine.

Daniel Reversed

Daniel

Brian

Brian Reversed

Lou Gehrig's Disease Research

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Leech Neurophysiology Lab

Purpose: The purpose of this lab was to attempt to identify the different types of cells that are located within the Ganglion of a leech.


Hypothesis: I predict that the different types of cells will have a larger reaction when stimulated by a harder object like the probe or forceps while having little reaction to a feather.


Materials: 

• Feather - Used to give the leech skin a very gentle touch stimulation.
• Probe - A blunt metal rod used to lift tissue, and to push the skin as a stimulus.
• Forceps - Used for very fine manipulations.
• Scissors - Angled dissecting scissors, used to cut the body wall open.
• Pins - Used for pinning tissue to a dissecting dish or board.
• Scalpel - For microsurgery, used to make incisions in the leech.
• Dissection Tray - The tray that the leech was pinned to.
• Leech Tank - Used to keep the leeches in a natural like environment.
• 20% Ethanol - Used to anesthetize the leech, more humane, it stops them from moving.
• Leech Tongs - Blunt tips so that the leech will not be harmed from picking it up.
• Dissection Microscope - Specifically designed for dissection and other micro-manipulations.
• Micro-manipulator - A device used to position the leech with sub-micrometer precision
• Oscilloscope - A sophisticated voltmeter.
• Leech - Medical leeches, 15-20cm long, 1-2cm wide

Procedure: First thing we had to do in this lab was to catch a leech from the tank and then anesthetize it and place it on the tray. Then we pinned it down, cut it down the middle, used forceps to tear the skin apart and then pinned the flaps to the tray. We then had to remove the innards with a probe so we could find the nerve cord which is encased in the ventral sinus. Then cut a window out of the ganglion under the dissection microscope, then cut a parallel section of the skin out and did the same with an ultra fine scalpel. Then used the micro-manipulator to stimulate the ganglion. Injected dye solutions into different spots and then used a UV switch to see where the dye had spread to. Then used an atlas to determine what type of cell we had stimulated.


Results: The results turned out pretty good overall. The atlas really helped to determine the types of cells we were probing, but some of them I still got wrong. The lab helped me understand the different types of cells a bit better.


Conclusions: The chart below shows that I was actually very wrong with my hypothesis. The 5 different types of cells found in the Ganglion all react differently to different types of stimulation.

Skeletal Muscle Tissue

This is a picture of a typical but very complicated skeletal muscle tissue. This picture is a very basic view, there are actually a lot more to go with this, but for now I will discuss the basics to this muscle. This tissue is key to being move, when it contracts or expands it allows us to move. Skeletal muscles are often called voluntary muscle since its the only type you can control subconsciously, and is responsible for your overall body mobility. It is also the main component in keeping our body warm. As it contracts rapidly it produces heat, and we store this heat to keep us warm. There are hundreds of tiny parts to this muscle that result in our movement, here are a few of the important ones and what they actually do.

The Fascicle - The fascicle is part of the muscle that is a discrete bundle of muscle cells, it is actually segregated from the rest of the muscle by a connective tissue sheath. It is surrounded by a perimysium.
Muscle Fiber - It is an elongated multi nucleate cell, which has striations, which is basically just a series of color changes in bands. It is surrounded by the endomysium.
Myofibril - It is a complex organelle composed of bundles of myofilaments, they occupy most of the muscle cell volume, and appear banded, like striations. It is composed of sarcomeres arranged from end to end.
Sarcomere - It is a segment of a Myofibril. The contractile unit, composed of myofilaments.
Myofilament - It is an extended macromlecular structure that has thick and thin filament that contain bundled myosin molecules. The thin filaments contain actin molecules as well as proteins.

This is basically the larger and more detailed version of the picture above, but shows a lot more of the tissue that I have no idea what they do. But they all contribute to our body movement in one way or another.

EKG Food Lab

Bone Fractures



Comminuted Fracture

 Comminuted fractures tend to be fractures that broke into three or more peices, the one above is more like 6 peices. It is common in the elderly since their bones are often brittle and weak.

Complete Fracture

 Complete fractures are fractures where the bone is broken all the way through rather then ones like greenstick that are still connected.

Compound Fracture

Compund fractures are the nastier of the bunch, compund meaning that the bone breaks through the surface of the skin. Common when there is an extreme force on a section of the bone and it snaps quickly and sends one end up.

Compression Fracture

A compression fracture is when the bone is crushed rather then broken. It is common in people who have osteoporotic bones, or those that have been subjected to to extreme trauma in a fall.

Depression Fracture

A depression fracture is typically in the skull. Its when a broken bone is pressed inward. The inward press on a skull also has a good chance to leave a compound fracture too.

Displaced Fracture

A displaced fracture is when bone ends are out of normal alignment and usually have to be set again.

Epiphyseal Fracture

Epiphyseal fractures is when the Epiphsis seperates from the diaphysis along the epiphyseal plate. Tends to occur when cartilage cells are dying and calcifaication of the matrix is occuring.

Greenstick Fracture

Greenstick is a very common type of fracture in children since thier bones are not fully developed and still bend a bit. The bone breaks incompletely, only one side of the shaft breaks;the other side bends.

Incomplete Fracture

Incomplete fracture is when the bone is not broken all the way through, this is basically the same as a greenstick fracture.

Linear Fracture

Linear fractures is when a fracture occurs along or parallel to the long axis of the bone.

Non-Displaced Fracture

Non-Displaced Fracture is like a hairline fracture, the bone doesnt completely break and it remains in its normal position.

Simple Fracture

Simple fractures are very common, its just when a fracture occurs and the bone doesn't penetrate the skin.

Spiral Fracture

Spiral fractures are very common with sports injury's. A break occurs in a twisting motion and ragged ends are made.

Transverse Fracture

Transverse fractures are fractures that are through the bone. Unlike Linear fractures they occur perpendicular to the long axis of the bone rather then parallel to it.

Article on Tissue Engineering Research

http://www.pbs.org/saf/1107/features/body.htm

The link above is to a site where it talks about all the recent research that has been going on in tissue engineering. Reseachers and engineers from all over the world have came together for the common goal of offering a solution to the everyday diseases and problems our bodies may run into. They have began to engineer ears on specially bred mice. They do this by impanting a scaffling of young cartilage on the back of a mouse that is hairless and has no immune system so it wont reject the ear. The mouse then nourishes the ear and when it is fully grown and molded the ear can be removed with little harm to the mouse. This is just a small step, in the future researchers hope to be able to make virtually anything. Ultimately their goal is to improve human life expectancy by engineering organs, cartilage, and bone.

I was very surprised when i read the article, I didn't have any idea that this was going on in the world. I think it is a great way to help people with terminal diseases. Surprisingly to me this research has been allowed by the vatican, which has denied many things like this in the past because they saw it is an ethical issue.