Describe the difference between intrinsic and extrinsic control of the heart.

Expert Solution

*INTRINSIC CONTROL OF HEART

-Intrinsic control is due to specialized cells that initiate and distribute. electrical impulses in an orderly manner through out 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.

-It modifies Stroke Volume through functional charecteristics of Cardiac muscle Cells.

-Intrinsic Control---Increased Venous Return-End Diastolic Volume Increases--Strength of Cardiac contraction increases-Stroke Volume Increases.

-It include-

a)Local Myogenic Control

b)Local Reflexes

c)Local vaso Active Substances

EXTRINSIC CONTROL

-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

-It involves Nueral and hormonal Control

-a)Parasympathetic Stimulation-Supplied by Vagus nerve-Reduce Heart rate through neurotransmitter acetyl choline

b)Sympathetic stimulation-Increases heart rate and force of contraction through Epinephrine and nor epinephrine

Sydney Mullin answered 2 years ago

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