What is the difference between intrinsic and extrinsic control of the heartbeat?

The heart has both intrinsic (situated within the heart) and extrinsic (originating outside the heart) regulation. Many myocardial cells have unique potential for spontaneous electrical activity (intrinsic rhythm). In normal heart, spontaneous electrical activity is limited to special region.

What is intrinsic regulation of the heart?

Intrinsic regulation of the heart rate (HR) includes the myogenic sublevel and the sublevels of cell-to-cell communication, the cardiac nervous system, and humoral factors produced within the heart. Myogenic regulation is considered to be the first sublevel in control of the cardiac function.

What is extrinsic regulation of the heart?

Extrinsic controls of the cardiovascular system include neuronal, humoral, reflex, and chemical regulatory mechanisms. These extrinsic controls regulate heart rate, myocardial contractility, and vascular smooth muscle to maintain cardiac output, blood flow distribution, and arterial blood pressure.

What is intrinsic regulation?

Tissues and organs within the body are able to intrinsically regulate, to varying degree, their own blood supply in order to meet their metabolic and functional needs. This is termed local or intrinsic regulation of blood flow.

What are the intrinsic and extrinsic ways the body controls blood flow?

Extrinsic control involves mechanisms that act from outside an organ or tissue, through nerves or hormones, to alter arteriolar resistance. Intrinsic control is exerted by local mechanisms within an organ or tissue.

What is intrinsic control in VB?

Intrinsic Controls. Intrinsic controls – are the basic set of twenty controls in the Toolbox. Controls exist within the Visual Basic .exe file. do not have to add these to Toolbox.

How does intrinsic control affect heart rate?

This intrinsic automaticity, if left unmodified by neurohumoral factors, exhibits a spontaneous firing rate of 100-115 beats/min. This intrinsic firing rate decreases with age. Heart rate is decreased below the intrinsic rate primarily by activation of the vagus nerve innervating the SA node.

What is Autoregulated?

Autoregulation is a manifestation of local blood flow regulation. It is defined as the intrinsic ability of an organ to maintain a constant blood flow despite changes in perfusion pressure. As resistance decreases, blood flow increases despite the presence of reduced perfusion pressure.

What are the intrinsic and extrinsic controls of blood flow?

What is extrinsic control of blood flow?

Extrinsic control involves mechanisms that act from outside an organ or tissue, through nerves or hormones, to alter arteriolar resistance. Dilation of the arterioles decreases arteriolar resistance and therefore increases blood flow to the tissue.

What is blood flow regulation?

Regulation of blood flow is managed by adjusting the contraction or relaxation of smooth muscle fibers in the walls of arterioles and capillaries. This control can be systemic, affecting the whole circulatory system, or localized to specific tissues or organs.

What is intrinsic and ActiveX control?

2 Introduction Intrinsic Controls – the basic set of twenty controls in the toolbox. Are a part of the .exe VB program. ActiveX Controls – exists as separate files. Files have a . ocx extension.