Regulation of heart, Biology

Regulation of Heart

The number of electrical impulses initiated by the SA node is primarily the result of its innervation by fibers from both sympathetic and parasympathetic branches of the autonomic nervous system. Sympathetic branch have a positive chronotropic effect (increase in rate) while parasympathetic branch have a negative chronotropic effect (decrease in rate). Parasympathetic innervations occurs by way of the vagus nerve. Sympathetic nerve fibers, when stimulated release norepinephrine at the nerve endings and comprise what is called the adrenergic system. 

The central nervous system regulate the heat through the cardiac center in medulla and the hypothalamous.

Posted Date: 10/30/2012 6:01:24 AM | Location : United States







Related Discussions:- Regulation of heart, Assignment Help, Ask Question on Regulation of heart, Get Answer, Expert's Help, Regulation of heart Discussions

Write discussion on Regulation of heart
Your posts are moderated
Related Questions
Define phases of the absorption of iron? The process of absorption is divided into three phases: i) Iron uptake by enterocytes (epithelial cell of the superficial layer of t

Q. Can you define termination of the stress Test? Test should be terminated when: 1) PVCS develop in pairs or with increasing frequency or when ventricular tachycardia devel

What is condition for the Mendel's second law to be valid? The Mendel's second law is only valid for genes located in various chromosomes. For genes situated in the similar chr

What is Carbohydrates? Carbohydrates : Carbohydrates function mainly as immediate sources of energy, stored energy such as starch, and structural components of cells. Carbohyd

Difference between rod and cone cells

Aldosterone mediates myocardial remodeling and fibrosis, as well as sodium retention and potassium loss at the distal tubules. The anti-aldosterone agent, spironolactone   has been

In an experiment, isolated chloroplast thylakoids were incubated at pH 4.0 with ADP and inorganic phosphate (Pi) added to the medium and then transferred to a medium having pH 8.0.

a) What is biological magnification? b) Describe how DDT as a water pollutant undergoes biological magnification?

Somatic Embryogenesis The process of embryo development is called embryogenesis. It is not the monopoly of the egg to form an embryo. Any cell of the female gametophyte (Embr

What category do pisces, mammalla, amphibia, reptilia and aves fall into