what type of cells secrete norepinephrine and epinephrine? State whether the fol
ID: 3518277 • Letter: W
Question
what type of cells secrete norepinephrine and epinephrine?
State whether the following will INCREASE, DECREASE or has NO EFFECT if
triggered by parasympathetic or sympathetic in the heart.
Condition Parasympathetic Tone Sympathetic Tone
1. Heart Rate
2. Force of contractility
(in the atria)
3. Force of contractility
(in the ventricles)
4. Influx of Na+
5. Influx of Ca2+
6. Efflux of K+
Explanation / Answer
1. The cells of adrenal medulla secrete norepinephrine and epinephrine as they act as primary site for converting amino acids to these hormones.
Condition parasympathetic tone sympthetic tone Heart rate decreases(rest and digest situation) increses (due to hormone release in fight or flight situation) Force of contraction in atria decreases (since only less blood is required at rest) increases(since more blood is required in fight or flight) Force of contraction in ventricles decreases(less blood requirement) increases(more blood requirement to transport oxygen) Influx of Na+ no effect increses( hormones act on beta receptors and causes influx of Na+ which increses heart rate) Influx of Ca2+ increases increases Efflux of K+ increases(to cause hyperpolarization) no effectRelated Questions
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