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

Forebrain - olfactory lobes, Forebrain 1 .       OLFACTORY LOBES - ...

Forebrain 1 .       OLFACTORY LOBES - 1 pair, very small, solid, club shaped, separated from each other. Fully covered by cerebral hemispheres on dorsal side, clear on

Fats requirement in pectic ulcer, Q. Fats requirement in pectic ulcer? ...

Q. Fats requirement in pectic ulcer? Fats: These delay the gastric emptying. The products of fat digestion in the small intestine stimulate entrogastrone, which inhibits gastri

Apical ectodermal ridge or aer, Apical Ectodermal Ridge (AER) We have ...

Apical Ectodermal Ridge (AER) We have described earlier that the AER persists at the tip until the last phalangeal cartilage begins differentiation. The following experiments

Explain about the salting - methods of food processing, Explain about the S...

Explain about the Salting - Methods of Food Processing? Salting: Salting, especially of meat, is an ancient preservation technique. Food is treated with salt or a strong salt s

Neurofilaments and microtubules - nervous system, Normal 0 fals...

Normal 0 false false false EN-IN X-NONE X-NONE

Diaphragmatic hernia, Diaphragmatic Hernia: In this condition there  i...

Diaphragmatic Hernia: In this condition there  is a slight herniation ofabdominal organs  (stomach intestine and liver) or extreme protrusion of abdominal contents into the th

Approximate composition of human tissue, Approximate Composition of Human T...

Approximate Composition of Human Tissue Table gives the approximate composition of human tissue. We all know that carbon, oxygen, hydrogen are present in water and other organ

Enzymes, Biological catalysts à speed up chemical reactions in the body wit...

Biological catalysts à speed up chemical reactions in the body without being consumed in the process Reduce the activation energy needed for reactants to reach the transit

What is peri-implantitis, Peri-Implantitis (Infective Process- Bacterial Or...

Peri-Implantitis (Infective Process- Bacterial Origin) Bacterial invasion of the peri-implant soft tissue results in its inflammation followed by rapid bone loss. Peri-Implanti

Biologists established that new cells, Biologists established that new cell...

Biologists established that new cells Consequent to this doctrine, biologists established that new cells are formed by cell division and by the end of the nineteenth century, t

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