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Norepinephrine : [NEET Kar. 2013]
(1) Is released by sympathetic fibres
(2) Is released by parasympathetic fibres
(3) Increases the heart rate
(4) Decreases blood pressure
Which of the above said statements are correct?
(1) Is released by sympathetic fibres
(2) Is released by parasympathetic fibres
(3) Increases the heart rate
(4) Decreases blood pressure
Which of the above said statements are correct?
- a)(1) and (4)
- b)(1) and (3)
- c)(2) and (3)
- d)(2) and (4)
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
Norepinephrine : [NEET Kar. 2013](1) Is released by sympathetic fibres...
Norepinephrine is released by sympathetic fibres i.e, rapidly secreted in response to stress of any kind and during emergency situations. It increases the heart beat, the strength of heart contraction and the rate of respiration.
Most Upvoted Answer
Norepinephrine : [NEET Kar. 2013](1) Is released by sympathetic fibres...
Norepinephrine is a neurotransmitter and hormone that is released by the sympathetic nervous system. It plays an important role in the body's response to stress and is involved in the fight or flight response.
Statements about Norepinephrine:
1. Is released by sympathetic fibres: True.
- Norepinephrine is released by sympathetic nerve fibres in response to stress or other stimuli.
2. Is released by parasympathetic fibres: False.
- Norepinephrine is not released by parasympathetic nerve fibres. Acetylcholine is the primary neurotransmitter released by the parasympathetic nervous system.
3. Increases the heart rate: True.
- Norepinephrine acts on the heart to increase heart rate and contractility. This helps to increase blood flow and oxygen delivery to the body during times of stress.
4. Decreases blood pressure: False.
- Norepinephrine actually increases blood pressure by constricting blood vessels. This helps to redirect blood flow to the most critical organs during times of stress.
Therefore, the correct statements about Norepinephrine are (1) and (3).
Statements about Norepinephrine:
1. Is released by sympathetic fibres: True.
- Norepinephrine is released by sympathetic nerve fibres in response to stress or other stimuli.
2. Is released by parasympathetic fibres: False.
- Norepinephrine is not released by parasympathetic nerve fibres. Acetylcholine is the primary neurotransmitter released by the parasympathetic nervous system.
3. Increases the heart rate: True.
- Norepinephrine acts on the heart to increase heart rate and contractility. This helps to increase blood flow and oxygen delivery to the body during times of stress.
4. Decreases blood pressure: False.
- Norepinephrine actually increases blood pressure by constricting blood vessels. This helps to redirect blood flow to the most critical organs during times of stress.
Therefore, the correct statements about Norepinephrine are (1) and (3).
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Community Answer
Norepinephrine : [NEET Kar. 2013](1) Is released by sympathetic fibres...
Together with adrenaline, norepinephrine increases heart rate and blood pumping from the heart. It also increases blood pressure and helps break down fat and increase blood sugar levels to provide more energy to the body.
In the brain, norepinephrine plays a role in the sleep-wake cycle, helping you to wake up, in increasing attention and focusing on performing a task ,and in memory storage. It is also important for emotions. Problems with norepinephrine levels are associated with depression, anxiety, post-traumatic stress disorder and substance abuse. Bursts of norepinephrine can lead to euphoria (very happy) feelings but are also linked to panic attacks, elevated blood pressure, and hyperactivity. Low levels can cause lethargy (lack of energy), lack of concentration, attention deficit hyperactivity disorder (ADHD), and possibly depression. Some anti-depressant medications affect norepinephrine levels in the brain.
In stressful situations, norepinephrine increases as part of the fight or flight response to mobilize the brain and body for action.
Norepinephrine can be used to treat low blood pressure (hypotension) that can occur during certain medical procedures or life-threatening situations where cardiopulmonary resuscitation (CPR) is needed.
In the brain, norepinephrine plays a role in the sleep-wake cycle, helping you to wake up, in increasing attention and focusing on performing a task ,and in memory storage. It is also important for emotions. Problems with norepinephrine levels are associated with depression, anxiety, post-traumatic stress disorder and substance abuse. Bursts of norepinephrine can lead to euphoria (very happy) feelings but are also linked to panic attacks, elevated blood pressure, and hyperactivity. Low levels can cause lethargy (lack of energy), lack of concentration, attention deficit hyperactivity disorder (ADHD), and possibly depression. Some anti-depressant medications affect norepinephrine levels in the brain.
In stressful situations, norepinephrine increases as part of the fight or flight response to mobilize the brain and body for action.
Norepinephrine can be used to treat low blood pressure (hypotension) that can occur during certain medical procedures or life-threatening situations where cardiopulmonary resuscitation (CPR) is needed.
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