The difference between arterial blood and venous blood

Blood is an important component of the human body and an important fluid that ensures the normal functioning of various body functions. Blood is generally divided into venous blood and arterial blood. These two types of blood have their own characteristics, are located in different positions in the human body, and have different functions and effects. Next, I will introduce to you arterial blood and venous blood and the differences between the two types of blood.

1. Introduction to arterial blood

Arterial blood is the blood that flows in the arteries of the systemic circulation (macrocirculation) and the blood in the pulmonary veins that returns from the lungs to the left atrium in the pulmonary circulation (macrocirculation). Arterial blood contains more oxygen and less carbon dioxide and is bright red. Because blood has just been sent from the heart, the arterial walls are subjected to higher blood pressure. Arterial blood is the carrier that transports oxygen from the alveoli to other tissues of the body (to be precise, the hemoglobin in the red blood cells in the arterial blood is the carrier). Arterial blood becomes venous blood as it passes through other tissues, where oxygen is taken up and carbon dioxide is released.

2. Introduction to venous blood

Venous blood is the blood that flows in the veins of the systemic circulation (macrocirculation) and the blood that flows from the right ventricle to the pulmonary artery in the pulmonary circulation (macrocirculation). Blood that contains more metabolic waste is dark red. Such as carbon dioxide, urea and other substances.

Please note that the blood flowing in the veins is not necessarily venous blood, and the blood flowing in the arteries is not necessarily arterial blood, because the blood flowing in the pulmonary artery is venous blood, and the blood flowing in the pulmonary veins is arterial blood.

3. The difference between arterial blood and venous blood

Arterial blood and venous blood are determined according to the oxygen content in the blood. Hemoglobin combines with oxygen, and the blood at this time is arterial blood. Hemoglobin separates from oxygen, and the blood now contains less oxygen and is dark red in color. This type of blood is called venous blood. The judgment of arterial blood and venous blood has nothing to do with blood vessels and the nutrients in the blood. The blood flowing in the arteries is not necessarily arterial blood (such as venous blood flowing in the pulmonary artery), and the blood flowing in the veins is not necessarily venous blood (such as arterial blood flowing in the pulmonary veins). The nutrient content in arterial blood is not necessarily higher than that in venous blood. For example, the venous blood flowing through the small intestine contains more nutrients than that in arterial blood.