What is microcirculation? What is microcirculation

We know that the large arteries gradually branch into small arteries, which in turn branch through multiple levels and finally become microarterioles. The diameter of the arteriole is generally less than 300 microns (i.e. millimeters), and it branches step by step, successively divided into precapillary arterioles and intermediate arterioles, and the middle arterioles are divided into many true capillaries, which are actually commonly known as capillaries. As for the venules, the diameter of the tube is generally less than 200 microns, of which the capillaries immediately after the capillaries are called postcapillary venules, and the diameter of the postcapillary venules is generally 10 50 microns.

Microcirculation refers to the blood circulation in the microvessels between the arterioles and the veins, which is generally composed of seven parts: arterioles, intermediate arterioles, precapillary sphincter, true capillaries, direct pathways, arteriovenous anastomosis branches and venules. The blood vessels involved in the microcirculation are very small, and the thickest ones are less than 500 microns. Microcirculation is the basic functional unit of blood circulation, which can regulate blood flow and plays a very important role in the nutrition and excretion of metabolites from tissue cells.

Microcirculation refers to the circulation of blood between arterioles and venules.

The blood circulation between arterioles and veins is mainly carried out by nerve and body fluids to regulate the relaxation activity of vascular smooth muscle, and the most fundamental function is to exchange substances between blood and tissues, and ultimately affect the blood flow of microcirculation.

Microcirculation refers to the blood circulation between arterioles and venules, and is the place where blood and tissue cells exchange substances.

The 3 pathways of microcirculation and their functions:

1) Circuitous access (vegetative pathway): Composition: access of blood from arterioles, posterior arterioles, anterior capillary sphincter, true capillaries, and venules; Function: It is the main place for the exchange of substances between blood and tissue cells.

2) Direct and Rapid Access: Composition: Blood from the arterioles, posterior arterioles, blood capillaries, and venules; Function: Promote rapid blood return. It is more common in skeletal muscle of this pathway.

3) Arteriovenous short circuit: Composition: blood from the arteriole arteriole anastomosis branch of the microvenous vein pathway; Function: Regulates body temperature. This pathway** is more distributed.

Microcirculation refers to the blood circulation in the microvessels, which consists of arterioles, posterior arterioles, anterior capillary sphincter, capillaries, arteriovenous anastomoses and venules, and the fluids (blood, lymph, and interstitial fluid) flowing through them.

The microvessels are very thin, only one-twentieth of a human hair; The walls of microvessels are thin, only one hundredth the size of a piece of paper. Microvasculature is found throughout the human body and its main function is metabolism for material exchange.

During blood circulation, microcirculation transports oxygen and nutrients to tissues and cells, and excretes carbon dioxide and metabolic waste products out of the body.

1. Circuitous pathway (nutritional pathway):

Composition: Blood from arterioles, posterior arterioles, anterior capillary sphincter, true capillaries, access to venules;

Physiological significance: It is the main place for the exchange of substances between blood and tissue cells.

2. Direct access:

Composition: Blood from arterioles, posterior arterioles, capillaries, venules access;

Physiological significance: Promote rapid blood return. Slag sheds are more common in skeletal muscles of this pathway.

3. Arteriovenous short circuit:

Composition: Blood from the micro-arterial pulse-venous anastomosis branch of the microvenous access;

Physiological significance: used to regulate body temperature. This pathway** is more distributed.

Microcirculation refers to the blood circulation between arterioles and venules, and is the place where blood and tissues exchange substances.

The 3 pathways of microcirculation and their functions:

1) Circuitous pathway (vegetative pathway): Composition of the old posture: blood from the arteriolar filial nucleus, posterior arteriole, anterior capillary sphincter, true capillary, venulby access; Function: It is the main place for the exchange of substances between blood and tissue cells.

2) Direct and Rapid Access: Composition: Blood from the arterioles, posterior arterioles, blood capillaries, and venules; Function: Promote rapid blood return. It is more common in skeletal muscle of this pathway.

3) Arteriovenous short circuit: Composition: blood from the arteriole arteriole anastomosis branch of the microvenous vein pathway; Function: Regulates body temperature. This pathway** is more distributed.