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Subject: stress response Author: bronwyn [ Next Thread | Previous Thread | Next Message | Previous Message ] Date Posted: 15:37:36 08/22/01 Wed Do you know why the heart races during the stress response? we need to think about the Sympathetic nervous system (SNS) stimulation of heart rate & the adrenal glands. SNS neurotransmitter - what is it and what does it bind to to increase heart rate? the same neurotransmitter binds to receptors on bronchioles - What is the effect? How does this improve the flight response? same neurotransmitter stimulates adrenals----> Glucocorticoids are released from the adrenals during the stress response to ensure sufficient glucose is available for flight. Which other hormones are released from the adrenals & how do they complement the nervous system response?? post your thoughts & if you don't know we can nut it out until we do. [ Next Thread | Previous Thread | Next Message | Previous Message ]

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[> Subject: Re: stress response Author: Debbie [ Edit | View ] Date Posted: 15:30:13 08/25/01 Sat Ok, I'll have a go at answering this Bronwyn. Norepinephrine binds with beta receptors in the heart to strengthen contractions. Dilates the bronchioles for more air intake, stimulates the adrenals to release more epinephrine to sustain and prolong the effects. [ Post a Reply to This Message ]

[> [> Subject: Re: stress response Author: bronwyn [ Edit | View ] Date Posted: 15:25:48 09/02/01 Sun quite correct debbie a bit more detail is required. Norepinephrine binds with beta-1 receptors on heart muscle to strengthen contractions. Also binds with same receptors on sinoatrial node to increase heart rate. Dilation of the bronchioles occurs due to Norepinephrine binding with beta-2 receptors stimulates the adrenals to release more epinephrine and norepinephrine. Any ideas about the glucocorticoids??? [ Post a Reply to This Message ]