By Faith Hickman Brynie
Asks and solutions questions on center, blood, and circulatory procedure. applicable for heart tuition, highschool, and non-physician adults. comprises details on center motion, palpitations, middle assaults, leeches, transplants, blood chemistry, and the significance of nutrition, workout, and never smoking in hold cardiovascular wellbeing and fitness.
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Extra resources for 101 Questions About Blood and Circulation: With Answers Straight From the Heart
Doctors say the heart makes two sounds when it beats. ” These are not the sounds of contraction, but the sounds made by the valves as they close between the chambers of the heart. During systole, the valves close between the atria and the ventricles. They prevent backflow from ventricles to the atria. At the same time, the valves to the arteries—both pulmonary and aorta—open. This makes the first “lub” sound. During diastole, the opposite occurs. The valves between the ventricles and the arteries shut, while those between the atria and ventricles open.
What Is Anemia, and How Is It Treated? • • • • • • • The root cause for many types of anemia is unknown. We don’t know why the body would destroy its own red cells or why the bone marrow should make too few. In other cases, the cause is known, and treatment can be directed accordingly. For example, eating more iron-rich vegetables or taking an iron supplement can reverse some forms of irondeficiency anemia. What Is Sickle-Cell Disease, and How Is It Treated? Sickle-cell disease is perhaps the best-known of the inherited forms of anemia.
The heart’s natural pacemaker, also called the sinoatrial or S-A node, is a bundle of nerve and muscle tissue in the right atrium. These cells differ from other heart muscle cells. They contract on their own, without any signal or stimulus from other cells. The S-A node sends out a tiny electrical impulse that travels through the muscular walls of the atria. The impulse travels to the atrioventricular or A-V node, located between the atria and the ventricles. From there, it continues through the muscular walls of the ventricles, causing them to contract.