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What are the intrinsic and extrinsic controls of the heart?

What are the intrinsic and extrinsic controls of the heart?

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?

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. Several mechanisms are responsible for local blood flow regulation.

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 are the intrinsic factors that affect the heartbeat?

Heart rate is determined by four factors:

  • Intrinsic rate: The natural rate of discharge of cardiac tissue in the absence of other factors.
  • Sympathetic activity: Increases heart rate.
  • Parasympathetic activity: Decreases heart rate.
  • Pharmacologic: Increases or decreases heart rate depending on the drug.

What is the difference between intrinsic and extrinsic factors?

While intrinsic factors act from within an individual, extrinsic factors wield their influence from the outside (i.e., they are environmental, cultural, or related to lifestyle). Extrinsic factors can have a sizeable impact on a person’s health and can affect medical decision-making.

What is the difference between intrinsic and extrinsic regulation?

An intrinsic controlled system is inherent in an organ; the organ is capable of maintaining homeostasis within itself. Extrinsic control systems (nervous and endocrine systems) exist outside of the organs they control; these systems can override intrinsic systems.

What is the difference between intrinsic and extrinsic control?

Both extrinsic and intrinsic mechanisms regulate blood flow; extrinsic mechanisms regulate blood flow throughout the body, while intrinsic mechanisms regulate blood flow to specific target tissues.

What are the intrinsic factors?

Intrinsic factor is a protein that helps your intestines absorb vitamin B12. It is made by cells in the stomach lining.

What are examples of intrinsic factors?

The intrinsic factors include 1) attention, 2) memory, 3) motivation, and 4) psychomotor learning stage13. These factors are less tangible and more difficult to measure than the extrinsic factors.

What is intrinsic punishment?

Intrinsic motivation involves doing something because it’s personally rewarding to you. Extrinsic motivation involves doing something because you want to earn a reward or avoid punishment.

What is intrinsic cardiac regulation?

There are two primary modes by which the blood volume pumped by the heart, at any given moment, is regulated: 1) intrinsic cardiac regulation, in response to changes in the volume of blood flowing into the heart; and 2) control of heart rate and cardiac contractility by the autonomic nervous system.

Why is homeostasis extrinsic?

Extrinsic. Most homeostatic systems are extrinsic: they are controlled from outside the body. Endocrine and nervous systems are the major control systems in higher animals. The nervous system depends on sensors in the skin or sensory organs to receive stimuli and transmit a message to the spinal cord or brain.