Biology: The human heart
By: Henk Woei
The human heart is a muscular organ that is composed of four compartments; two small upper compartments called the left and right atria, and two large lower compartments called the left and right ventricles. The heart is essentially a pumping station that permits blood to...
By: Erich Rosenberger M.D.
Red blood cells, known also as RBCs, have several important roles to play in our bodies. The primary function of red blood cells is to carry oxygen from the lungs to the tissues around your body. As a secondary function, they are also a key...
By: Jonte Rhodes
Helium or He to give it its periodical name is a noble gas that has many uses in modern society and many people might encounter it every day. It is lighter then oxygen or the air we breathe (which is a mixture of chemicals) and...
By: Furious Lee
Medical errors in the United States cost an estimated 37.6 billion dollars annually in extra healthcare expenses, lost income and disability insurance. And to families, no amount of money can compensate the lost of a loved one to a preventable mistake. A 1999 study...
By: Mika
Peutz-Jegher's SyndromePeutz-Jegher's Syndrome (PJS) is a rare autosomal dominant disorder. Thus, it is not a sex-related disorder and can instead be inherited from either parent. PJS affects an estimated 1 in 25,000 people. It is caused by mutations in the STK11 gene located on...
How blood flows through the heart
By: Erich Rosenberger M.D.
The human heart is a marvel of efficiency and function. It beats on average about 70 times per minute, every second of every day of your life. It never needs a rest and never pauses for a break - at least not if you are...
How do pheromones work?
By: Daniel K Dean
The standard definition of a pheromone is "a form of chemical communication between members of the same species." How pheromones work depends on what the end result of the communication is supposed to be, and what's doing the communicating. The most research on pheromone...
By: Pamela Sosnowski
A couple of years ago, I tried something new: I donated blood. I'm not sure what held me back for so long, unless it was the one distinct discouraging memory that goes back to my high school days, where I remember witnessing several of my...
By: Makeisha Lee
Let's face it, today's society dictates how we should look, what we should have, what we should do to make ourselves look better, and ultimately feel better about who we are. We turn on the T.V, ride down the freeway and see billboards of...
The heart: An overview
By: Alicia M Prater PhD
The human heart consists of 4 chambers which rhythmically pump blood between the lungs and the extremities to gather and distribute oxygen. The heart itself is a muscle made of cardiac fibers and specialized fibers that conduct electrical impulses for the involuntary contraction and relaxation...

 

1 51 52 53 54 55 296