Human Heart Parts And Their Functions Pdf

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The cardiovascular system can be thought of as the transport system of the body.

Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. Cardiovascular disease is the leading cause of death worldwide.

Anatomy of the Human Heart

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. The vital importance of the heart is obvious. If one assumes an average rate of contraction of 75 contractions per minute, a human heart would contract approximately , times in one day, more than 39 million times in one year, and nearly 3 billion times during a year lifespan.

The heart is a muscular pump that serves two functions: 1 to collect blood from the tissues of the body and pump it to the lungs and 2 to collect blood from the lungs and pump it to all tissues of the body. The human heart lies in the protective thorax, posterior to the sternum and costal cartilages, and rests on the superior surface of the diaphragm. The heart assumes an oblique position in the thorax, with two-thirds to the left of midline. It occupies a space between the pleural cavities called the middle mediastinum , defined as the space inside the pericardium, the covering around the heart. This serous membrane has inner and outer layers, with a lubricating fluid in between. Unable to display preview. Download preview PDF.

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.

Structure of the Heart

The human heart is an organ that pumps blood throughout the body via the circulatory system, supplying oxygen and nutrients to the tissues and removing carbon dioxide and other wastes. In humans, the heart is roughly the size of a large fist and weighs between about 10 to 12 ounces to grams in men and 8 to 10 ounces to grams in women, according to Henry Gray's " Anatomy of the Human Body. The physiology of the heart basically comes down to "structure, electricity and plumbing," Phillips told Live Science. The right atrium and right ventricle together make up the "right heart," and the left atrium and left ventricle make up the "left heart. A double-walled sac called the pericardium encases the heart, which serves to protect the heart and anchor it inside the chest. Between the outer layer, the parietal pericardium, and the inner layer, the serous pericardium, runs pericardial fluid, which lubricates the heart during contractions and movements of the lungs and diaphragm.

Your heart does a lot of work to keep the body going. Each day, the average human heart beats about , times, pumping 2, gallons of blood through the body. In fact, the heart does more physical work than any other muscle over a lifetime. Located between the lungs in the middle of the chest, the heart pumps blood through the network of arteries and veins known as the cardiovascular system. Blood delivers oxygen and nutrients to every cell and removes the carbon dioxide and other waste products made by those cells. Blood is carried from the heart to the rest of the body through a complex network of arteries, arterioles and capillaries.

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The heart is made up of four chambers. The upper two chambers are called atria singular: atrium and the lower two are known as ventricles singular: ventricle. On the right side of the heart, the right atrium and ventricle work to pump oxygen-poor blood to the lungs.

The human heart is a finely-tuned instrument that serves the whole body. It is a muscular organ around the size of a closed fist, and it sits in the chest, slightly to the left of center. This delivers oxygen- and nutrient-rich blood to tissues and organs and carries away waste. The heart sends deoxygenated blood to the lungs, where the blood loads up with oxygen and unloads carbon dioxide, a waste product of metabolism. Together, the heart, blood, and blood vessels — arteries, capillaries, and veins — make up the circulatory system.

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.

The heart: All you need to know

In this interactive, you can label parts of the human heart. Drag and drop the text labels onto the boxes next to the diagram. Selecting or hovering over a box will highlight each area in the diagram. Drag and drop the text labels onto the boxes next to the heart diagram. If you want to redo an answer, click on the box and the answer will go back to the top so you can move it to another box. If you want to check your answers, use the Reset Incorrect button.

The current approach to understanding cardiac dynamics relies upon movements that adhere to the conventional topographical separation of cardiac muscle into the left ventricle, right ventricle, and septum. Functional analyses have addressed them independently, and this approach has resulted in many suppositions that this report will define and question. Alternatively, cardiac muscle mass is formed by the helix and surrounding circumferential wrap described by Lower in the s [ 1 ], Senac in the s [ 2 ], Krehl in the s [ 3 ], Mall in the s [ 4 ], and more recently by Torrent Guasp [ 5 ]. For example, the left ventricular free wall and septum are usually discussed separately, yet both are formed by the same muscle Figure 1 and their function cannot be separated unless isolated focal lesions exist. For this reason, the anterior descending and posterior descending coronary arteries are simply vascular highways perched upon the top or bottom of the helical muscle forming the septum and its adjacent LV free wall. Upper left—intact heart. Upper right—circumferential or basal loop unfolding its right segment.

Он двигался методично, обходя один ряд за другим. Наверху лениво раскачивалась курильница, описывая широкую дугу. Прекрасное место для смерти, - подумал Халохот.  - Надеюсь, удача не оставит. Беккер опустился на колени на холодный каменный пол и низко наклонил голову. Человек, сидевший рядом, посмотрел на него в недоумении: так не принято было вести себя в храме Божьем.

Functions is of the heart & blood vessels. ▫ 1. the heart is an essential pumping organ in the cardiovascular system where the right heart pumps deoxygenated.

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Казалось, Стратмор ее не слышал. - В последние несколько лет наша работа здесь, в агентстве, становилась все более трудной. Мы столкнулись с врагами, которые, как мне казалось, никогда не посмеют бросить нам вызов. Я говорю о наших собственных гражданах. О юристах, фанатичных борцах за гражданские права, о Фонде электронных границ - они все приняли в этом участие, но дело в другом.

 В шифровалке нет камер слежения? - удивился Бринкерхофф. - А что, - спросила она, не отрываясь от монитора, - нам с Кармен нужно укромное местечко. Бринкерхофф выдавил из себя нечто невразумительное.

При этом дерево иногда приходится потрясти, чтобы собрать подгнившие плоды. И я уверена, что большинство наших граждан готовы поступиться некоторыми правами, но знать, что негодяи не разгуливают на свободе. Хейл промолчал. - Рано или поздно, - продолжала она, - народ должен вверить кому-то свою судьбу. В нашей стране происходит много хорошего, но немало и плохого.

Взглянув на Следопыта, она нахмурилась. - Ну давай же, - пробормотала.  - У тебя было много времени. Сьюзан положила руку на мышку и вывела окно состояния Следопыта.

Ее мысли прервал шипящий звук открываемой пневматической двери. В Третий узел заглянул Стратмор. - Какие-нибудь новости, Сьюзан? - спросил Стратмор и тут же замолчал, увидав Грега Хейла.  - Добрый вечер, мистер Хейл.  - Он нахмурился, глаза его сузились.

Ей надо было выкупить билет на самолет - если найдется свободное место перед вылетом. Беккер почувствовал, как кровь отхлынула от его лица. - Куда. - В ее трахнутый Коннектикут.

Компьютер только что отдал ее Следопыту команду самоуничтожиться раньше времени, так что ей не удастся найти то, что она ищет. Помня, что не должен оставлять следов, Хейл вошел в систему регистрации действий и удалил все свои команды, после чего вновь ввел личный пароль Сьюзан. Монитор погас.

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    The heart is a muscular pump that serves two functions: (1) to collect blood from the The human heart assumes an oblique position in the thorax, with two-thirds to the left of parts of the body to the right atrium. The right ventricle pumps.

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