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
M A TERNIT Y AND CHILD HEALTH & FAMILY PLANNING - 1.       The health centers give necessary information, guidance & assistance to mother before & after delivery pregnant wo

Explain the Uses of ISP in meat products Meat products  The main application of ISP in connection with meat and related products is based on the use of texturized ISP, in

What are respectively some remarkable functions of myosin, CD4, albumin, keratin, immunoglobulin, reverse transcriptase, hemoglobin and insulin? Myosin is a protein that when a

What is the quaternary structure of a protein? Do all proteins have quaternary structure? The quaternary protein structure is the spatial conformation because of interactions b

Eyes We have a pair of eyes. They are held in socket of the skull by four rectus muscles and two oblique muscles. These muscles control the movements of the eyes. The wall of t

Name a few foods which are best blanched? Yes, green beans, carrots, okra, turnip and cabbage should always be blanched. On the other hand, blanching is not needed for onions,

What is d excretory organ of the agama lizard

Explain the Occurrence of vitamin B 6 Vitamin B 6 activity is attributed to the 3 compounds-pyridoxol (pyridoxine), pyridoxal and pyridoxamine, generally comprised in the vit

describe the path of nitrogen through its biogenochemicsal cycle

When the level of AMP is high, this shows the requirement for more ATP synthesis. AMP stimulates PFK increases the rate of glycolysis and inhibits fructose 1 and 6- bisphosphatase