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 it is important to study about soil, Why does one need to study about s...

Why does one need to study about soil and what is  its importance? You would be aware that, from the dawn of agriculture, cultivators were attracted to fertile soils of river

Why is it not correct to assert that the dna, Q. Why is it not correct to a...

Q. Why is it not correct to assert that the DNA self- replicates? The DNA is not completely self-sufficient in its duplication process because the replication does not occur wi

Fats requirement in diabetes, Q. Fats requirement in diabetes? Fats: Th...

Q. Fats requirement in diabetes? Fats: The total fat recommended by WHO is less than 30% of the total calories. However in view of the widely prevalent Asian paradox in India,

Explain acidic stains (anionic) - types of stains, Explain Acidic Stains (a...

Explain Acidic Stains (anionic) - Types of Stains? These are sodium, potassium, calcium or ammonium salts of coloured acids, which on ionization give negatively charged chromog

Define the objectives in the biochemistry of the eye, Define the objectives...

Define the objectives in the biochemistry of the eye. After going by this section, you should be familiar with: a. Dynamic of vascular supply of eye; b. The cornea metabo

List out points about the traditional food preservation, List out Points ab...

List out Points about the Traditional Food Preservation? 1. The traditional food preservation methods like drying, pickling, salting, smoking, canning and freezing have been wi

What are the elements that form the middle ear, Q. What are the elements th...

Q. What are the elements that form the middle ear? What are the names of the three middle ear ossicles that participate in the phonosensitivity? The middle ear is formed by the

Define immediate preoperative period during surgery, Define Immediate Preop...

Define Immediate Preoperative Period during Surgery? Nothing should be given by mouth for at least 8 hours before a general surgery so that the stomach has no leftover food at

Explain the carrying capacity in ecology, Explain the carrying capacity in ...

Explain the carrying capacity in ecology? Carrying Capacity :  We have seen that natural populations do not normally achieve the maximum intrinsic rate of natural increase, o

Pattern of cleavage, define the pattern of cleavage i all aspects

define the pattern of cleavage i all aspects

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