Why does your heart rate change with emotions?

Question

Like when you're scared or excited, your heart starts beating faster.

Answer 1

There are 2 things you must know:
1) The sympathetic system
2) The parasympathetic system.
At the normal state, Our body is controlled by the Parasympathetic system because we are at rest.
Therefore, everything is normal. In other words, there is salivation,urination, myosis of the eyes(Narrowing of eyes), the heart beat is normal and everything is good.
WHILE AT THE SYMPATHETIC STATE (UNDER STRESS EITHER EXCITED OR SCARED), the opposite occurs.
You will find the following:
1) Less-no urination.
2) Less-no salivation.
3) Increased heart beats.
4)Mydriasis of the eye (Wideneing of the eye similar to the effect caused by Atropa belladonna{It is aplant} )
5)Less digestion due to the decreased secretions.

All these things happened due to the release of Epinephrine (Adrenaline) and Nor epinephrine (Nor adrenaline)..
As these neurotransmmitors cause vasoconstriction to all blood vessels.
Absolutely, this is due to the interaction occured between the neurotransmittor and the receptor first which then will act by causing the vasoconstriction.
This mechanism is so complex but so wonderful as your body is accompanying your mood.
You have to know that the receptors have the major role in that as there are
1)Alpha1 receptors.
2) alpha 2 receptors.
3) Beta 1 receptors.
4) Beta 2 receptors.
Concerning Alpha1 Actions:
a) Vasoconstriction
b) Increased blood pressure due to the decreased blood flow.
c) Mydriasis.
d) Increased closure of the Sphincter of the bladder.
Concerning the Alpha2 actions:
a) Inhibition of the norepinephrine release.
b) Inhibition of Insulin release.
Concerning the Beta 1 Actions:
a) Tachycardia (Increased in the heart beats)
b) Increased Lipolysis.
c) Increased myocardial contractility (Increased heart contraction)
d) Increased release of renin.
Concerning Beta2 Actions:
a) Vasodilatation.
b) Relaxed uterine smooth muscle.
c) Increased release of glucagon.
d) Increased muscle and liver glycogenolysis.
e) Bronchodilatation.
f) Slightly decreased peripheral resistance.
All the previous were the Adrenoreceptors (Adrenergic receptors which the adrenaline and noradrenaline can act on)
I wish you read more about it within the library and you can search for any pharmacology book and the simplest book you can find these information within it is the "Lippincott's pharmacology book " the third edition
I wish you understand and sorry for any elongation
If you want to know the synthesis and the release of the norepinephrine and epinephrine, I can say it to you in more details.

Answer 2

The reason why your heart rate changes with emotions is mainly regulated in two ways:
1. By Chemical Hormones
2. Autonomic Nervous System
1.In case of anxiety or fear excesss of adrenalin (also known as "fight and flight hormone" ) is released from adrenal medulla of adrenal glands which works in increasing the amount of oxygen supply to cardiac muscles thus increasing the speed of heart beat........

2. Nervous system also plays a role in comntrolling heart rate.....The cardiac centre in medulla oblongata regulates beat rate... which work by stimulating sinu-atrial node3 and thus increasing the beating rate..!!!!!!
tis it in breif.... I hope you understand

Answer 3

Emotional or physical stressors such as being frightened activate the sympathetic nervous system (or SNS), which controls your body's "fight or flight" response during emergency situations. The SNS causes your body to release a hormone called norepinephrine at your body's nerve synapses (the point at which nerves "connect" to each other). This hormone binds to receptors in the heart, causing the heart's pacemaker to fire more rapidly with less relaxation time in between firings, which makes the heart beat faster.

Answer 4

the one who wrote the long reply is right...and it has nothing to do with pressur eon the brain. Concisely, when you have emotions such as fear, your body releases a chemical called epinephrine (aka adrenaline). This chemical tells your heart to go faster.

When my friends and I were trying to learn about this is the beginning of med school, we used to think about being chased by a bear. When you are scared (because you are being chased by a bear) then you want your whole body to gear up to get away from said bear: heart go faster so more blood gets to your running muscles, eyes get wider to see, stop peeing and pooping (no time for a pit stop in running from the bear), lungs get more open for more oxygen for the run...etc.

Answer 5

Because the same hormone, adrenaline, is released when you are excited or scared, as preparation, as bafler answered, for fight or flight.
But really, it is your body's early warning that, if a girl is getting you excited, be afraid, be very afraid, and run for it.

Answer 6

yes it does sweetie!!well the logic behind it is very simple indeed,when ur heart is excited there is immense pressure on the brain..u see wen we r excited our activities increase..same fr scared too,so this means if its workin hard it need blood for oxygen,so in order to fulfill the demand created by the brain (for excess blood) our heart tends to beat faster!!..there are many other detailed reason like the hormonal secretion becomes fast so in order to provide the correct hormones to brain the blood is need to run faster and more in amount..so it beats faster..

i guess u got wht i wanted to convey;)
take care
bye!

Answer 7

Because the chemicals in ur body change as ur reactions change.

Answer 8

chemicals,your body releases them upon different stimuli-love ,anxiety,danger even death

Answer 9

In preparation for fight or flight.