ZAEEM's BLOG

Introduction to the Circulatory System Introduction to the Circulatory System The circulatory system is a network that carries blood throughout the body. All animals except the simplest kinds have some type of circulatory system. The human circulatory system supplies the cells of the body with the food and oxygen needed to survive. At the same time, it carries carbon dioxide and other wastes away from the cells. The circulatory system also helps regulate body temperature and carries substances that protect the body from disease. In addition, the system transports chemical substances called hormones, which help regulate the activities of various parts of the body. The Heart The heart is a hollow, muscular organ that pumps blood. It consists of two pumps that lie side by side. These pumps relax when taking in blood and contract as they send out blood. The left side of the heart is a stronger pump than the right side. The stronger pump receives blood from the lungs and sends it to cells t

THE IMMUNE SYSTEM: INNATE AND ADAPTIVE BODY DEFENSES I. A variety of cells and structures work together to protect the human body from bacterial,    fungal and viral infection. This resistance to disease (also known as immunity ) allows the    body to maintain its health.             A. There are two primary defense systems in the body that work both independently and                  cooperatively to provide resistance to disease. Those two systems are :                         1. The Innate (Nonspecific) System                         2. The Adaptive (Specific) System             B. The immune system is considered to be a functional system instead of an organ                  system. It is composed of chemicals and trillions of immune cells that inhabit                  lymphoid tissue and circulate in body fluids.                         1. When functioning properly, this system protects the body from infectious                              microorganisms and cancer cells. II. INN