1) Through the veins of a large circle of blood circulation, the medicine will enter the right atrium, and then into the right ventricle.
2) From the right ventricle in a small circle (pulmonary arteries and pulmonary veins) will enter the left atrium.
3) Then, from the left atrium to the left ventricle, further along the aorta and carotid artery, a large circle will enter the brain.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.