What is the intrinsic control?

Intrinsic control system is the inherent property of an organ in order to maintain homeostasis within the organ. But, in the extrinsic control system, it is done with the help of the nervous and endocrine systems.

What is the extrinsic control?

Abstract. 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 an example of intrinsic control?

Intrinsic regulation is when organs are able to maintain homeostasis on their own. An example of this, is the heart being able to control its own…

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

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 intrinsic control of blood flow?

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 the difference between autoregulation and extrinsic regulation?

Autoregulation occurs when the activities of a cell, tissue, organ, or organ system change automatically (that is, without neural or endocrine input) when faced with some environmental change. Extrinsic regulation results from the activities of the nervous or endocrine systems.

What are arterioles?

An arteriole is a small-diameter blood vessel in the microcirculation that extends and branches out from an artery and leads to capillaries. Arterioles have muscular walls (usually only one to two layers of smooth muscle cells) and are the primary site of vascular resistance.

What does blood control mean?

Acute local blood flow regulation refers to intrinsic regulation, or control, of arterial vascular tone at a local level, meaning within a certain tissue type, organ, or organ system. … There are several mechanisms by which vascular tone, and therefore blood flow, is controlled.

Where are the baroreceptors?

Baroreceptors are spray-type nerve endings in the walls of blood vessels and the heart that are stimulated by the absolute level of, and changes in, arterial pressure. They are extremely abundant in the wall of the bifurcation of the internal carotid arteries (carotid sinus) and in the wall of the aortic arch.

What are Precapillary sphincters?

Medical Definition of precapillary sphincter

: a sphincter of smooth muscle tissue located at the arterial end of a capillary and serving to control the flow of blood to the tissues.

What is a vein?

Veins are blood vessels that carry blood low in oxygen from the body back to the heart for reoxygenation. … Arteries and veins are two of the body’s main type of blood vessels. These vessels are channels that distribute blood to the body. They’re part of two closed systems of tubes that begin and end at the heart.

What do venules do?

Venules are the smallest veins and receive blood from capillaries. They also play a role in the exchange of oxygen and nutrients for water products. There are post-capillary sphincters located between the capillaries and venules. The venule is very thin-walled and easily prone to rupture with excessive volume.

What is in the circle of Willis?

The Circle of Willis is the joining area of several arteries at the bottom (inferior) side of the brain. At the Circle of Willis, the internal carotid arteries branch into smaller arteries that supply oxygenated blood to over 80% of the cerebrum.

What arteries carry?

The arteries (red) carry oxygen and nutrients away from your heart, to your body’s tissues. The veins (blue) take oxygen-poor blood back to the heart. Arteries begin with the aorta, the large artery leaving the heart. They carry oxygen-rich blood away from the heart to all of the body’s tissues.

What valves are in veins?

One-Way Valves in the Veins

One-way valves consist of two flaps (cusps or leaflets) with edges that meet. These valves help veins return blood to the heart. As blood moves toward the heart, it pushes the cusps open like a pair of one-way swinging doors (shown on the left).