In mathematics, a coefficient is a multiplicative factor in some term of a polynomial, a series or any expression; it is usually a number, but may be any expression. In the latter case, the variables appearing in the coefficients are often called parameters, and must be clearly distinguished from the other variables. For example, in.
Vasovagal syncope is a common cause of fainting. The vagus nerve is overstimulated and causes the body's blood vessels to dilate and the heart to slow down. This anti-adrenaline effect decreases the ability of the heart to pump blood upward to the brain against gravity. Without blood flow, the brain turns off.
The most common cause of fainting is a sudden loss of blood flowing to the brain. 1  This may be a result of any, or a combination of, the following: 2  A reduction in the amount of blood being pumped out of the heart. 3  Certain drugs such as digitalis, calcium channel blockers and others.