Umara Ayub M.D., M.B.A

Categories Authors and Contributors (4) Cardiovascular System (16) Clinical/Cardiology (3) CVS Embryology (3) CVS Pathology (1) CVS Physiology (1) CVS Questions (1) EKG (3) Hemodynamics (5) Drbeen's Favorite Books (1) USMLE Step 1 Books (1) Gastrointestinal Tract...

Immunity and Immune System

IMMUNITY Immunity is the capability of our body to defend against the microorganisms including bacteria, viruses, fungi, and parasites. IMMUNE SYSTEM All cells, chemicals, and tissues acting together to offer immunity make up the immune system. Examples of the cells...

Introduction to Immunology (Part 1)

Accompanying video lecture on Drbeen.com: https://members.drbeen.com/view/overview-innate-and-acquired-arm-1/rkhSjfCd2lW Our immune system is a major organ system in our body that helps defend against the microorganisms trying to invade us. A majority of the patients...

Pharyngeal Arch Arteries

The aorta arises from the left ventricle as its outflow tract. Aorta forms an arch before  descending downwards as the thoracic/descending aorta. This arch of aorta gives rise to three arteries; from right to left these arteries are the brachiocephalic trunk, left...