How does the body make electricity — and how does it use it?

Without electricity, you wouldn’t be reading this article right now. And it’s not because your computer wouldn’t work. It’s because your brain wouldn’t work.

Everything we do is controlled and enabled by electrical signals running through our bodies. As we learned in intro physics, everything is made up of atoms, and atoms are made up of protons, neutrons and electrons. Protons have a positive charge, neutrons have a neutral charge, and electrons have a negative charge. When these charges are out of balance, an atom becomes either positively or negatively charged. The switch between one type of charge and the other allows electrons to flow from one atom to another. This flow of electrons, or a negative charge, is what we call electricity. Since our bodies are huge masses of atoms, we can generate electricity

When we talk about the nervous system sending “signals” to the brain, or synapses “firing,” or the brain telling our hands to contract around a door handle, what we’re talking about is electricity carrying messages between point A and point B. It’s sort of like the digital cable signal carrying 1s and 0s that deliver “Law & Order.” Except in our bodies, electrons aren’t flowing along a wire; instead, an electrical charge is jumping from one cell to the next until it reaches its destination.

Electricity is a key to survival. Electrical signals are fast. They allow for a nearly instantaneous response to control messages. If our bodies relied entirely on, say, the movement of chemicals to tell our hearts to speed up when something is chasing us, we probably would’ve died out a long time ago.

Those crucial signals that tell our hearts to speed up when we’re in danger come from a mass of cells in our heart called the sinoatrial node, or SA node. It’s located in the right atrium, and it controls the rhythm of our heartbeat and the movement of blood from the heart to every other part of our body. It’s our body’s natural pacemaker, and it uses electrical signals to set the pace (see what determines the rhythm of your heart?). But our pulse isn’t the only thing that relies on electrical impulses generated by our cells. Almost all of our cells are capable of generating electricity.

In this article, we’ll look at the role of electricity in the body and find out how we generate it in the first place.

The starting point is simple: Right now, any cells in your body that aren’t actively sending messages are slightly negatively charged. It gets interesting from there.

Read more:

http://science.howstuffworks.com/life/human-biology/human-body-make-electricity.htm

 

How Sitting Too Long Affects your Body

Muscle Weakness:

Sitting for developed times of time without substituting the figure’s position can influence the muscles in the torso, neck and bears. On account of the muscles in the proposed parts of the form must be kept in a slightly settled position while sitting, the gore vessels are crushed and gore stream is diminished to these places, creating exhaustion. This muscle weakness likewise can donate to for the most part weariness and firmness.

Lowered Blood Circulation:
Moreover expanding muscle weariness, the let down gore course that goes with sitting moreover can accelerate an assemblage of different situations. Gore frequently pools in the easier legs, bringing about numbness and varicose veins.

Obesity and Risk of Fatality:
Obesity has a direct link to elevated blood fats known as triglycerides, which are the main fats in the body. Studies have shown that sitting for extensive periods is directly related to elevated blood fats resulting in obesity. After only an hour and half of sitting down, your metabolism starts to slow down. The enzyme lipase becomes ineffective, and you are unable to metabolize fat properly. This usually increases cholesterol levels. Making a conscious choice to stand more and move a little reduces higher levels of triglycerides.

Bad Posture Increases the Risk of Chronic Back and Neck Injuries:
You might not notice your improper posture when you are too busy with your work. Flipping back and forth of your uncomfortable chair is just one way to refresh yourself and your body of that stressful work so changing your sitting positions once in a while might help stimulate good blood flow but it might not be helpful in your posture. You might find yourself slouching without noticing it.

Sitting for a long time places a high amount of stress on the spine, specifically in the lower back and neck regions. Over time, sitting can result in compression of the spinal discs that leads to compromised spinal nutrition and lowered back health. Additionally, because muscles in the back and neck become tightened from pressure, sudden movements in these areas can lead to injury.

Increased Risk of Diabetes:
Although sitting for too long is not a sure indicator of diabetes, it does make the sitter 26 percent more likely to develop metabolic syndrome, a condition that often leads to diabetes, according to a 2010 article published in the British Journal of Sports Medicine.

Heart problem:
This is because sitting hampers smooth blood circulation in your body. If the blood does not flow properly, it will result to leap of blood pressure and it will be tougher work for the heart plus the fact that sitting promotes cholesterol in the body.

Weaken immune system:
The body needs ample amount of exercise to be healthy. The nutrients cannot smoothly flow in all parts of the body if the body is not at work. Thus resulting to weaken immune system, sickness and ailments.

Blood clots:
As what we’ve stated earlier, it requires movement for the blood to flow smoothly in the body. Sitting might cause blood clots in the lower parts of the body which is dangerous when these blood clots reach the heart and lungs.

To know more:

http://www.ehow.com/info_7823912_side-effects-sitting-long-time.html

http://www.healthmango.com/fitness/serious-effects-of-prolonged-sitting/

http://everythingheated.typepad.com/blog/2011/02/list-of-harmful-effects-due-to-excessive-sitting-and-its-remedy.html

http://www.makeuseof.com/tag/4-health-issues-sitting-long-avoid/