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

What are the functions of the spleen, Q. What are the functions of the sple...

Q. What are the functions of the spleen? Why is a total splenectomy (surgical removal of the spleen) compatible with life? The spleen has many functions: it participates in the

How you would dispose off sharps and needles, Q. How you would dispose off ...

Q. How you would dispose off sharps and needles? Used needles should not be bent or broken prior to disposal. Unsheathed needles are placed directly into the designated, punctu

Ornithine-urea cycle, Normal 0 false false false EN-IN ...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

What do you mean by wound closure, Q. What do you mean by Wound closure? ...

Q. What do you mean by Wound closure? Generally the incisions designed for minimal exposure such as the H - shaped incision, do not require suturing, as the abutment and the tr

Blood pressure, An adequate level of pressure is needed in the arteries to ...

An adequate level of pressure is needed in the arteries to keep the blood flowing through the cardiovascular system. The chief determinant of arterial pressure is the volume of blo

What is the effect of increase temperature, 1) What is the effect of increa...

1) What is the effect of increase temperature on a non enzyme catalyzed reaction? 2) What are the effects of increased temperature on an enzyme catalyzed reaction?

Guidelines for the family members for healthy coping, Q. Guidelines for the...

Q. Guidelines for the Family Members for Healthy Coping? - Patient and the family members should discuss the situation, change in role,time distribution, share of money and oth

Define principle for iodine number estimation - lipids, Define Principle fo...

Define Principle for Iodine Number Estimation - Lipids? Iodine number is defined as the number of grams of iodine absorbed by 100 grams of fat, it gives an idea of the relative

Water absorption and transpiration, Water Absorption and Transpiration ...

Water Absorption and Transpiration The rate of water absorption is controlled by the rate of transpiration. A high water potential in the atmosphere would reduce water loss fr

List the five functions controlled by hypothalamus, List the five functions...

List the five functions controlled by hypothalamus. Hypothalamus controls many important functions which are as follows: a) Blood pressure control b) Hunger and thirst

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