Blood circulations

Blood circulations

There are three types of circulation :

1. Pulmonary circulation :

   - Venous blood passes from the right ventricle through the pulmonary trunk to the lungs to be oxygenated.
   -Oxygenated blood returns from the lungs through 4 pulmonary veins to the left atrium.
   
   
   






2. Systemic circulation :

   - Oxygenated blood passes from the left ventricle through the aorta and its branches to supply the different tissues of the body.
   - Venous blood returns from the tissues of the body along small veins which unites to form superior vena cava, inferior vena cava and coronary sinus which open into the right atrium.
   
   
   
   
   
   
   

3. Portal circulation :

   - The portal vein drains the venous blood from stomach, intestines, spleen and pancreas and passes into the liver.
   - This blood carries the products of digestion to the liver.
   - The portal vein divides repeatedly inside the liver to end in the liver sinusoids.
   - The liver sinusoids lead to hepatic vein which join inferior vena cava.
   - Thereafter, blood in the inferior vena cava enters the right atrium.