2007-02-07 23:56:28 · 5 answers · asked by Anonymous in Health ➔ Diseases & Conditions ➔ Heart Diseases
It's a sympatomimatic reflex which is initiated from the brain, which results in secretion of adrenaline glands, this gland in response secreates adrenaline, which has direct effect on the heart. The adrenergic receptors in the heart respond by increase of heart and peripheral vasoconstriction, this in turn forces the heart to beat at higher speed in order to expel the large volume of blood to beat faster.
2007-02-10 07:44:08 · answer #1 · answered by Dr.Qutub 7 · 0⤊ 0⤋
When you become nervous or to be more precise to get nervous adrenalin secretion should increase & that also causes increased heart rate may be up to techycardia stage.
2007-02-08 08:01:07 · answer #2 · answered by Dr. Arun 3 · 0⤊ 0⤋
When your nervous your blood pumps really fast so it makes your heart beat fast.
2007-02-08 19:29:35 · answer #3 · answered by wetcat2009 4 · 0⤊ 0⤋
Its because your heart wants u to feel the thrill of nervousness
2007-02-08 08:00:42 · answer #4 · answered by Lancelot 3 · 0⤊ 0⤋
Adrenaline. It makes you prepared for flight or fight
2007-02-08 07:59:13 · answer #5 · answered by Joe T 1 · 0⤊ 0⤋