Blood pressure

The force with which the blood leaves the arteries causes a pressure that is greater in systole movements, when the heart contracts and expels blood, than in diastole, with the heart relaxed and filling with blood. Therefore, when we measure blood pressure we have a maximum and a minimum blood pressure.

The arteries branch into arterioles that, with their muscular layers, regulate the amount of blood that has to reach each organ according to its needs.

When the blood reaches the capillaries, the pressure is low enough for the exchange of substances with the cells to develop correctly, leaving the nutrients and oxygen from the capillaries, and entering the waste substances, including CO₂.

The decrease in blood pressure in arterioles and capillaries is due to two reasons:

Any fluid flowing through a circuit loses pressure as it moves away from the driving organ (the heart).
The pressure of a fluid is lower the greater the volume of the enclosure through which it circulates. Although the diameter of the capillaries is very small, as they are very numerous, the total volume through which the blood circulates is greater.

The blood passes from the capillaries to the venules, and from these, to the veins that will carry it to the heart. But what force causes the blood to be propelled to the heart?:

In diastole, the heart has less pressure, which causes the suction of blood from the veins that causes it to flow towards it .
The contraction of the muscles that surround the veins causes the expulsion of the blood towards the heart, since the semilunar valves prevent its backward movement.

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Skip navigation Biology and Geology 3rd compulsory secondary education Biology and Geology 3rd ESO 01. General organization of the human body 1.1. Levels of organization of the human body 1.2. The cell 1.2.1. The prokaryotic cell 1.2.2. The eukaryotic cell 1.2.2.1. The eukaryotic animal cell 1.2.2.2. The eukaryotic plant cell 1.3. Tissues 1.4. Organs, systems and apparatus 1.5. Bibliography and student work 02. Food and health 2.1. Feeding and nutrition 2.2. Nutrients 2.2.1. Types of nutrients 2.2.2. The energy of nutrients 2.3. The food 2.4. Diets 2.5. Food consumption 2.5.1. Labelled 2.5.2. How to shop and cook 2.6. Food preservation and hygiene 2.7. Food production 2.7.1. Intensive agriculture 2.7.2. Intensive livestock 2.7.3. Aquaculture 2.7.4. Transgenic foods 2.7.5. Organic food 2.8. Eating-related illnesses 2.9. Bibliography and student work 03. The digestive system and digestion 3.1. Nutrition function 3.2. Digestive system 3.2.1. Ingestion 3.2.1.1. Chewing 3.2.1.2. 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Factors influencing the ecosystem 13.4. Balance in ecosystems 13.5. The soil as an ecosystem 13.6. Bibliography and student work 14. The external geological activity of the Earth 14.1. Solar energy on Earth 14.2. External geological processes 14.2.1. Weathering 14.2.2. Erosion, transport and sedimentation 14.3. Factors that condition the modeling of the relief 14.4. Forms of relief modeling 14.4.1. Wild or stream waters 14.4.2. Torrential modeling 14.4.3. River modeling 14.4.4. Karst modeling. Groundwater 14.4.5. Littoral modeling 14.4.6. Glacier modeling 14.4.7. Wind or desert modeling 14.5. Geological action of living beings 14.6. Geological action of the human being 14.7. Bibliography and student work 15. The internal geological activity of the Earth 15.1. The internal energy of the Earth 15.2. Volcanoes 15.2.1. Types of volcanoes 15.2.2. Volcanic risk 15.3. Earthquakes 15.3.1. Seismic risk 15.4. Bibliography and student work « Previous \| Next » 5.6. Blood pressure Blood pressure The force with which the blood leaves the arteries causes a pressure that is greater in systole movements, when the heart contracts and expels blood, than in diastole, with the heart relaxed and filling with blood. Therefore, when we measure blood pressure we have a maximum and a minimum blood pressure. The arteries branch into arterioles that, with their muscular layers, regulate the amount of blood that has to reach each organ according to its needs. When the blood reaches the capillaries, the pressure is low enough for the exchange of substances with the cells to develop correctly, leaving the nutrients and oxygen from the capillaries, and entering the waste substances, including CO₂. The decrease in blood pressure in arterioles and capillaries is due to two reasons: Any fluid flowing through a circuit loses pressure as it moves away from the driving organ (the heart). The pressure of a fluid is lower the greater the volume of the enclosure through which it circulates. Although the diameter of the capillaries is very small, as they are very numerous, the total volume through which the blood circulates is greater. The blood passes from the capillaries to the venules, and from these, to the veins that will carry it to the heart. But what force causes the blood to be propelled to the heart?: In diastole, the heart has less pressure, which causes the suction of blood from the veins that causes it to flow towards it . The contraction of the muscles that surround the veins causes the expulsion of the blood towards the heart, since the semilunar valves prevent its backward movement. Licensed under the Creative Commons Attribution Share Alike License 4.0 « Previous \| Next » You can ask, comment, contribute, get in touch with other users in the forum of this course. This course is translated from https://biologia-geologia.com/BG3/
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Blood pressure