- Reference information
- Medicines for the treatment of diseases of the cardiovascular system
- Blood and bleeding
- Articles on other topics related to the cardiovascular system
- Treatment of diseases of the heart and cardiovascular system
- Diagnosis of diseases of the heart and cardiovascular system
- Blood diseases: what are the disease symptoms in children and adults
- Heart disease: what are heart disease
- Directory of clinics of St. Petersburg
- Cardiologists in Saint Petersburg
- Thrombocytopenia: the extent and types, treatment, symptoms, and consequences
- Hypertension: causes, extent and stage, complications
- Thrombosis: symptoms and causes, diagnosis, treatment and consequences
- Pericarditis of the heart: causes, treatment, types and symptoms
- Leukopenia: extent, types, symptoms, causes and treatment, nutrition
- Embolism of the arteries and blood vessels, types, symptoms, causes, consequences
- Cardiac arrythmia: classification, types, treatment and prevention
- Thrombophlebitis: causes, symptoms, diagnosis, classification, treatment
- Heart failure: stages, functional classes, degrees, forms
- Heart defects: classification, causes, types, symptoms and treatment
- Leukemia blood: types and classification, reasons, symptoms, treatment
- Cardio heart: treatment, causes, types, symptoms and signs
- Cardiomyopathy: classification, symptoms, treatment, causes and prevention
- Ischemia: causes, treatment, consequences, extent, and symptoms
- Hypertension: types, causes, stages, symptoms and treatment
- Vegetative-vascular dystonia (VSD): causes, symptoms, treatment and prevention
- Varices (varicose veins): causes, symptoms and treatment
- Atherosclerosis: causes, types, stages, prevention and treatment
- Angiopathy of blood vessels: types, symptoms, treatment and prevention
- Bradycardia heart: symptoms, treatment and first aid for seizure
- Heart attack (myocardial): classification, forms, symptoms, diagnosis and treatment
- List of diseases of the heart and cardiovascular system
- Aneurysm of vessels: causes and symptoms, diagnosis, types and treatments
- Mitral valve: extent, causes, signs and contraindications
- A stroke of the brain: types, causes and treatment
- Arrhythmias: symptoms, treatment, causes, types, forms and prevention
- Angina heart: classification, forms, stages, causes, symptoms and treatment
- Heart tachycardia: symptoms, causes, treatment, classification
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Venous blood
The blood in the human body circulates in a closed system. The main function of a bodily fluid – providing cells with nutrients and oxygen and output of carbon dioxide and products of metabolism.
A little about the circulatory system
Human circulatory system is a complex device, the biological fluid circulates in both the small and big circle of blood circulation.
- Many people know what color it is. Due to the amount of carbon dioxide the color is dark, with a bluish tinge.
- She is poor in oxygen and nutrients, while there is a lot of metabolic products.
- Its viscosity is higher than that of blood, rich in oxygen. This is due to the increase in size of red blood cells in connection with the receipt in them of carbon dioxide.
- It has higher temperature and lower pH.
- Through the veins the blood flows slowly. This is due to the presence of valves, which slow down its speed.
- Veins in the human body more than arteries, and venous blood in General is about two-thirds of the total.
- In connection with the location of the veins, it flows close to the surface.
Composition
Laboratory studies make it easy to distinguish venous blood from arterial blood in composition.
- In venous oxygen tension in the norm is equal to 38-42 mm Hg (arterial – from 80 to 100).
- Carbon dioxide – about 60 mm Hg. article (in blood of about 35).
- A pH level of 7.35 leaves (blood is 7.4).
Function
Veins is blood flow, which carries metabolic products and carbon dioxide. It is possible to get nutrients that are absorbed by the walls of the digestive tract, and produced by glands of internal secretion hormones.
Movement through the veins
Venous blood with its movement overcomes the force of gravity and hydrostatic pressure tests, so if the damage to the veins she calmly flowing stream, and when damaged arteries abounds.
Its speed is much less than the arterial. The heart ejects blood blood pressure of 120 mm Hg, and after it passes through the capillaries and becomes venous pressure gradually decreases and reaches 10 mm Hg. post.
Why the analysis takes material from Vienna
In the venous blood contains the decomposition products produced in the metabolism process. When diseases fall into substances, which in normal condition should not be. Their presence allows to suspect the development of pathological processes.
How to determine the type of bleeding
Visually it is quite easy: blood from a vein is dark, thick and flowing as a steady stream, whileblood more liquid, has a bright scarlet hue and flowing as a fountain.