Mechanisms that affect the heart rate, Biology

Assignment Help:

Mechanisms that Affect the Heart Rate

Two different mechanisms affect the heart rate. Nerve impulse to the pacemaker region and hormonal influences. A branch of the vagues nerve of parasympathetic origin slows the heartbeat by releasing acetylcholine while another nerve of sympathetic origin releases epinepherine and norepinepherine at the pacemaker end to increase the heartbeat. Epinepherine is also a hormone that is released from the adrenal medulla into the blood. It accelerates heartbeat.

This you know is a well documented part of the fight-or-flight reaction. Apart from the vagus and sympathetic nerves, the pacemaker can be affected by temperature. This is observable when we have fever. Increased temperature increases the heart rate and fall in body temperature slows the heart rate.


Related Discussions:- Mechanisms that affect the heart rate

Why is quarrantine introduction of a plant species, Why is quarrantine a mu...

Why is quarrantine a must before introduction of a plant species from a dissimilar country? a) What is meant by apoplast pathway? Why does it occur in cortex and not in endoder

Etiological factor of diverticular disease, Q. Etiological factor of divert...

Q. Etiological factor of diverticular disease? The causes of diverticular disease are not certain, but several factors may contribute to changes in the wall of the colon. These

Define measuring body composition- total body potassium, Define measuring b...

Define measuring body composition- Total body potassium? It applies the' concept that body cells contain a constant amount of potassium and that its measurement is theref

Explain fibre and cardiovascular disease (cvd), Explain Fibre and Cardiovas...

Explain Fibre and Cardiovascular Disease (CVD)? The role-of dietary fibre in modulation of blood lipids was demonstrated by Keys and his co-workers in a series of experiments c

Define surgery, Define Surgery? Surgery ! Does the word itself not crea...

Define Surgery? Surgery ! Does the word itself not create a feeling of anxiety and bring our thoughts towards a debilitating state of health which would be accompanied by pain,

How sugar play a major role in preservation, How sugar play a major role in...

How sugar play a major role in preservation? In so many products, sugars play a major role in preservation. The addition of monosaccharides, like glucose or fructose, to jams a

Forebrain - cerebrum, CEREBRU M - Largest part of brain. 2/3 of bra...

CEREBRU M - Largest part of brain. 2/3 of brain. 4/5 of brain's weight. Cerebrum is devided into 2 cerebral hemispheres by longitudinal cerebral fissure. Gyri and sul

Composition of cell membrane, COMPOSITION Proteins = 44-76%,  Lipids...

COMPOSITION Proteins = 44-76%,  Lipids = 20-53%,      Carbohydrates = 1-8%,  (Protein-Lipid ratio = 0.8 : 1 to 4 : 1) Most of lipid are "Phospholipids" which are amphipat

Psychoactive plants of the old world, Archaeological data provide valuable ...

Archaeological data provide valuable information about the uses of plants in the past. Information comes from a number of sources, including fossil plant and human remains as well

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd