Learn the difference between Arteriosclerosis, Arteriolosclerosis, and Atherosclerosis. [9:17]

See how hyperplastic arteriolosclerosis (Protein in the arterial wall) makes it difficult for blood to go through blood vessels. Rishi is a pediatric infectious disease physician and works at Khan Academy. [5:10]

See how hyaline arteriolosclerosis (Protein in the arterial wall) causes hardening of the blood vessels. [11:13]

An atrial septal defect is a hole between the two atriums of the heart. Normally this hole is present at birth but closes within a few days of life. Failure of this hole to close is called an atrial septal defect, and usually is...

Learn about cardiac disease, atrial flutter. [3:55]