General Knowledge - Biology - Discussion

Discussion :: Biology - Section 1 (Q.No.52)


Norepinephrine increases

[A]. respiration
[B]. urine production
[C]. saliva production
[D]. blood pressure

Answer: Option D


No answer description available for this question.

Shikha said: (Apr 25, 2012)  
How norepinephrine increases blood pressure?

Mr.D said: (Jun 10, 2012)  
Norepinephrine [or] Noradrenalin is a stress harmone.It increases blood pressure by increasing "vascular tone"[Tension in vascular smooth muscle].

Kiruthi said: (Jun 28, 2012)  
Norepinephrine is a hormone secreted by certain nerve endings of the sympathetic nervous system, and by the medulla (center) of the adrenal glands.

Its primary function is to help maintain a constant blood pressure by stimulating certain blood vessels to constrict when the blood pressure falls below normal.

Anchal Jadiya said: (Apr 2, 2013)  
Norepinephrin acts saa drug increases blood pressure by vascular tone.

Samay Sah said: (Apr 4, 2013)  
When norepinephrine acts as a drug, it increases blood pressure.

By increasing vascular tone (tension of vascular smooth muscle) through α-adrenergic receptor activation; a reflex bradycardia homeostatic baroreflex is overcome by a compensatory reflex preventing an otherwise inevitable drop in heart rate to maintain blood pressure.

Norepinephrine is synthesized from dopamine by dopamine β-hydroxylase in the secretory granules of the medullary chromaffin cells. It is released from the adrenal medulla into the blood as a hormone, and is also a neurotransmitter in the central nervous system and sympathetic nervous system, where it is released from noradrenergic neurons in the locus coeruleus. The actions of norepinephrine are carried out via the binding to adrenergic receptors.

Lokanath Mohanta said: (Jun 13, 2017)  
Norepinephrine is an emergency hormone. It increases blood pressure by increasing heartbeat.

Sentayehu Abebe said: (Sep 28, 2017)  
Which hormone is responsible for the unwanted urination?

Mchuddlestone said: (Mar 19, 2018)  
C and D both are correct according to me.

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