What causes your heart to increase speed when your scared?

Answer 1

When something frightens you(blanket term for frightening or stressful things being a "stressor"), your body reacts to the stressor to prepare your body to fight or run away from the problem. This is where the term Fight or Flight comes from.

The hypothalamus sends an electrical impulse down your nerves to your adrenal glands, which sit on top of your kidneys. These produce adrenaline and send it into your bloodstream. Adrenaline can cause: your breathing to speed up; your pupils to dilate; saliva production to slow down or stop; blood to drain away from non-critical organs like skin and stomach; decreased sensitivity to pain; and your heart rate to speed up. This is an evolved process to help us escape or neutralise dangerous situations.

Answer 2

The heart tissue itself contains receptors called Beta receptors. The Beta receptors bind to chemicals in your blood called beta-agonists, such as Norepinephrine and epinephrine. The binding of these agents to the beta receptors cause an increase in heart rate. The mechanism is much more complex, but, in short, this is why the heart rates increases since epinephrine is released when an individual is frightened, as part of the fight-or-flight response. This is all a natural part of the nervous system.

Answer 3

You you are scared, your sympathetic nervous system is stimulated. Adrenaline hormone is secreted. This hormone and direct stimulation of the heart is responsible for faster heart beats when you are scared.

Answer 4

It's known as the "flight or fight syndrome". When you are frightened you body is preparing to either fight off an attacker or run away from one. In either case your muscles require more oxygen and your brain needs to think clearly. Therefore your heart begins to race until the danger passes.

Answer 5

It is because of a sudden rush of the hormone adrenaline or epinephrine, from the adrenal glands located above the kidneys. This activates the fight-or-flight response, and increases the heart rate, breathing rate and metabolism to allow you to escape quicker or fight harder, thus giving you a better chance of survival.

Answer 6

Your brain knows something bad going to happen to you do it auto sent something to your nerve system to protect you by pumping more blood that can increase your REACTION TIMES

Answer 7

In general, an increase of adrenalin causes increased heart rate.

Answer 8

because of adrenalin rushing ( i don't know how to spell adrenalin)

Answer 9

when your excited