Mechanisms that affect the heart rate, Biology

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.

Posted Date: 1/15/2013 11:43:36 PM | Location : United States







Related Discussions:- Mechanisms that affect the heart rate, Assignment Help, Ask Question on Mechanisms that affect the heart rate, Get Answer, Expert's Help, Mechanisms that affect the heart rate Discussions

Write discussion on Mechanisms that affect the heart rate
Your posts are moderated
Related Questions
Define Importance of Nutrition in Human Body? Nutrition is increasingly being recognized as an important determinant, which modulates the biological process of ageing. Poor nut

Q. Major objectives of diarrhoea? The major objectives in the management of diarrhoea include: 1. Fluid and electrolyte replacement 2. Removal of cause (especially if inf

Q. Of what substance is the plant cell wall made? Of which monomer is it made? The plant cell wall is made of cellulose. Cellulose is a polymer whose monomer is glucose. There

differnce between protonephridia and metanephridia

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

Q. List various type of insulin? Types of insulin: a) Rapid or Short acting b) Intermediate c) Combination d) Long acting

Q. Which is better-scrubbing the instruments or ultrasonic bath to clean the instruments? Ultrasonic bath to clean the instruments is better than hand scrubbing the instruments

Dyslipidemia is an important correctable factor for Coronary Artery Disease. There is a strong, independent, continuous, and graded relation between total cholesterol (TC) or low-

Q. Can you show the Systems of classification plants? The development of angiosperm classification has been one of the most fascinating subject. A study of sequential events le

Q. What Treatment should be used for cardiac tamponade? Percutaneous Pericardiocentesis Cardiac tamponade is an acute emergency and percutaneous pericardiocentesis must b