Bowel movement frequency
By: Pat Lunsford
Bowel function varies according to age, diet, exercise, and overall health but normal bowel movement frequency seems to be once a day for most people. It stands to reason that an elderly person who consumes less and gets very little exercise will not experience the...
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...
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...
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...
Understanding physiology
By: Erich Rosenberger M.D.
Physiology was one of the most interesting classes I took in Medical School. Derived from the ancient Greek words for "nature" or "origin" and "speech", physiology is the study of how living things function. Although there are many branches of physiology for many different types...
An introduction to the knee ligaments
By: Erich Rosenberger M.D.
An introduction to the ligaments of the kneeHave you ever found yourself watching a sporting event and seen an athlete lying on the ground with a damaged knee? Maybe you've wondered exactly what they mean byACL, PCL and meniscus? The knee joint is held together...
Biology: The human heart
By: Erich Rosenberger M.D.
The human heart is one of the most fascinating structures found within the human body. It serves as an extremely efficient pump, which never rests, never stops, and tirelessly pumps blood around your body every minute of every day for your entire life.The basic...
The largest blood type group
By: Jonte Rhodes
Human blood may appear to be all the same substance to the naked eye, however under a microscope it is quite a different story. Depending on the different sugars and antigens that are present in your own blood, there are several different types that your...

 

1 13 14 15 16 17 94