Structure and pumping action of heart pdf

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structure and pumping action of heart pdf

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The cardiovascular system can be thought of as the transport system of the body. This system has three main components: the heart , the blood vessel and the blood itself. Blood can be thought of as a fluid which contains the oxygen and nutrients the body needs and carries the wastes which need to be removed. The following information describes the structure and function of the heart and the cardiovascular system as a whole.

Cardiovascular system (heart) anatomy

The human heart is a four-chambered muscular organ , shaped and sized roughly like a man's closed fist with two-thirds of the mass to the left of midline. The heart is enclosed in a pericardial sac that is lined with the parietal layers of a serous membrane. The visceral layer of the serous membrane forms the epicardium. Three layers of tissue form the heart wall. The outer layer of the heart wall is the epicardium, the middle layer is the myocardium , and the inner layer is the endocardium. The internal cavity of the heart is divided into four chambers:.

Blood must always circulate to sustain life. It carries oxygen from the air we breathe to cells throughout the body. The pumping of the heart drives this blood flow through the arteries, capillaries, and veins. One set of blood vessels circulates blood through the lungs for gas exchange. The other vessels fuel the rest of the body.

The heart pumps blood through the body with the help of structures such as ventricles, atria, and valves. The heart is a complex muscle that pumps blood through the three divisions of the circulatory system: the coronary vessels that serve the heart , pulmonary heart and lungs , and systemic systems of the body. Coronary circulation intrinsic to the heart takes blood directly from the main artery aorta coming from the heart. For pulmonary and systemic circulation, the heart has to pump blood to the lungs or the rest of the body, respectively. Circulatory System : The mammalian circulatory system is divided into three circuits: the systemic circuit, the pulmonary circuit, and the coronary circuit. Blood is pumped from veins of the systemic circuit into the right atrium of the heart, then into the right ventricle.

How the Heart Works

The heart is a muscular organ in most animals, which pumps blood through the blood vessels of the circulatory system. In humans, other mammals, and birds, the heart is divided into four chambers: upper left and right atria and lower left and right ventricles. The wall of the heart is made up of three layers: epicardium , myocardium , and endocardium. The heart pumps blood with a rhythm determined by a group of pacemaking cells in the sinoatrial node. These generate a current that causes contraction of the heart, traveling through the atrioventricular node and along the conduction system of the heart. The heart receives blood low in oxygen from the systemic circulation , which enters the right atrium from the superior and inferior venae cavae and passes to the right ventricle. From here it is pumped into the pulmonary circulation , through the lungs where it receives oxygen and gives off carbon dioxide.

designed to as tool to assist nurse in understanding the hearts structure and how the heart the heart's pumping action, blood can't circulate within the body.

Pulmonary Circulation and Systemic Circulation: The Routes and Function of Blood Flow

The cardiovascular system is a closed system if the heart and blood vessels. The heart pumps blood through a closed system of blood vessels. Blood vessels allow blood to circulate to all parts of the body.

Aging changes in the heart and blood vessels

Some changes in the heart and blood vessels normally occur with age.

Understanding how your heart functions

How does the heart work? What does it do? What is it composed of?

Your heart is roughly the size of a fist and sits in the middle of your chest, slightly to the left. This blood sends oxygen and nutrients to all parts of your body, and carries away unwanted carbon dioxide and waste products. The two small upper chambers are the atria. The two larger lower chambers are the ventricles. These left and right sides of the heart are separated by a wall of muscle called the septum. Your heart pumps blood around the body all the time - about five litres eight pints of it - and this is called circulation. Your heart, blood and blood vessels together make up your cardiovascular system or heart and circulatory system.

Меган с силой толкнула стенку секции, но та не поддавалась. С ужасом девушка увидела, что сумка застряла в двери. Она наклонилась и что было сил потянула ее, стараясь высвободить застрявшую часть. Затуманенные глаза Беккера не отрываясь смотрели на торчащий из двери кусок ткани. Он рванулся, вытянув вперед руки, к этой заветной щели, из которой торчал красный хвост сумки, и упал вперед, но его вытянутая рука не достала до .

Structure of the Heart

Mammalian Heart and Blood Vessels

На ней стояли пустая бутылка из-под шампанского, два бокала… и лежала записка. Протерев глаза, она натянула на плечи одеяло и прочла: Моя драгоценная Сьюзан. Я люблю. Без воска, Дэвид. Она просияла и прижала записку к груди.

Странно, но его очки ничуть не пострадали. Странные очки, подумал Беккер, увидев проводок, который тянулся от ушных дужек к коробочке, пристегнутой к брючному ремню. Но он настолько устал, что ему было не до любопытства. Сидя в одиночестве и собираясь с мыслями, Беккер посмотрел на кольцо на своем пальце. Зрение его несколько прояснилось, и ему удалось разобрать буквы.


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