This chapter outlines the anatomy, physiology, and pathophysiology of the heart, linking the micro- and macroscopic structure of cardiac muscle fiber to its function during contraction and relaxation. The properties of cardiac muscle cells and the process of contraction at a cellular level are also described.
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The heart has four chambers, the right atrium and ventricle with the pulmonary circuit and left atrium and ventricle with the systemic circuit. The left ventricle’s greater workload makes it more massive than the right, but the two pump equal amounts of blood.
The Heart The Heart is: • Located between the lungs in the centre and to the left of the midline • It is cone shaped and about the size of your own clenched fist • Can never stop pumping Primary Function is to drive blood through the cardiovascular system delivering :
The heart is a hollow, muscular organ about the size of a fist. It is responsible for pumping blood through the blood vessels by repeated, rhythmic contractions. The heart is composed of cardiac muscle, an involuntary muscle tissue that is found only within this organ. The term "cardiac" (as in cardiology) means "related to the heart” and comes
the Heart • The intrinsic conduction system sets the basic heart rate, but this can be modified by the autonomic nervous system • The sympathetic nervous system (the “accelerator”) increases both the rate and the force of heartbeat. • The parasympathetic activation (the “brakes”) slows the heart Dr. Naim Kittana, PhD 36
Basically, the heart is a pump ensuring the continuous circulation of blood in the body. This article describes the heart’s anatomy and physiology. What is the heart? The heart weighs around 350g and is roughly the size of an adult’s clenched fist.
The Heart Structures of the Heart. Conduction System Functions of the Heart. The Blood Vessels and Circulation Blood Vessels. Blood Pressure Blood Circulation. Summary Critical Thinking. Websites Review Questions. OBJECTIVES. After reading this chapter, readers should be able to: 1. Describe the organization of the cardiovascular . system and ...
Welcome to Module 1: Anatomy and Physiology of the Heart. This self leaning package is designed to as tool to assist nurse in understanding the hearts structure and how the heart works. This module will form the foundation of your cardiac knowledge and enable you to understand workings of the heart that will assist you in completing other modules.
Anatomy of the Heart The heart is located in the chest, directly above the dia-phragm in the region of the thorax called mediastinum, specifically the middle mediastinum. The normal hu-man heart varies with height and weight (Table 1.1). The tip (apex) of the heart is pointed forward, downward, and toward the left.
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