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

Are protozoans presenting pulsatile, Q. Are protozoans presenting pulsatile...

Q. Are protozoans presenting pulsatile or contractile vacuoles easily found in fresh or in salt water? Fresh water is the less concentrated of solutes than sea water and it fre

Mouth bacteria and tooth decay, What is the connection among this substance...

What is the connection among this substance, mouth bacteria and tooth decay? Mouth bacteria use sugar for their metabolism and produce acids as a waste-product. The acids diss

Zoonoses disease-salmonellosis, Salmonellosis Salmonellosis is an infe...

Salmonellosis Salmonellosis is an infection caused by bacterial species belonging to the genus Salmonella and usually associated with the ingestion of food containing salmonel

Define microscopy and physiological analysis, Dr. Herbert discovers a cell ...

Dr. Herbert discovers a cell and he is convinced it is a plant cell. However, as a student of his genetics class, you do not agree with him. You do not believe in microscopy and ph

What are imago and nymph, Q. What are imago and nymph? Nymphs are larva...

Q. What are imago and nymph? Nymphs are larvae of hemimetabolic insects (like grasshoppers). They are very similar to the adult insect although smaller, In holometabolic insect

Standard titration - estimation of vitamin c in lemon juice, Explain Standa...

Explain Standard titration - Estimation of Vitamin C in Lemon Juice? Pipette 5 ml of standard ascorbic acid solution into a 100 ml conical flask. Fill the burette with the dye s

Why the diluent is distilled water, A drug has a molec. weight of 200. How ...

A drug has a molec. weight of 200. How many grams would you use to make 100 ml of a solution that is isotonic (for man)? Assume that the diluent is distilled water and that the dru

Anomalies related to oesophagus and stomach, Anomalies Related to Oesophagu...

Anomalies Related to Oesophagus and Stomach   Let us discuss briefly the anomalies of oesophagus and stomach. These are summarised as  follows: Associated Problems  1)  P

In what form nitrogenous wastes excreted in birds, In what forms are nitrog...

In what forms are nitrogenous wastes excreted in birds, humans and aquatic turtles respectively ? Why so, describe?

Explain genital herpes, Explain Genital herpes Acyclovir  (Zovirax,  a...

Explain Genital herpes Acyclovir  (Zovirax,  and others), famciclovir (Famvir) or valacyclovir (Valtrex) taken orally for 7-10 days shortens the duration of pain, viral sheddi

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