structure and function of the heart pdf Wednesday, May 26, 2021 1:22:41 PM

Structure And Function Of The Heart Pdf

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Blood is carried through the body via blood vessels. An artery is a blood vessel that carries blood away from the heart, where it branches into ever-smaller vessels.

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The Conduction System of the Heart

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.

Capillaries are the smallest blood vessels in the body, connecting the smallest arteries to the smallest veins. These vessels are often referred to as the "microcirculation. Only two layers of cells thick, the purpose of capillaries is to play the central role in the circulation, delivering oxygen in the blood to the tissues, and picking up carbon dioxide to be eliminated. They are also the place where nutrients are delivered to feed all of the cells of the body. There are three primary types of capillaries—continuous, fenestrated, and discontinuous or sinusoidal that are found in different regions of the body, and specialized capillaries in the brain make up the blood-brain barrier. Tests that evaluate the capillaries are important in assessing people medically, and there are several medical conditions associated with these vessels. They are so small that red blood cells need to flow through them single file.

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.

The heart: All you need to know

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.


A number of structures that can be observed in the adult heart are remnants of fetal circulation. In the fetus, the lungs do not function as a site for the exchange of.


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The heart valves allow unidirectional and unobstructed passage of blood without regurgitation, trauma to blood elements, thromboembolism, and excessive stress concentrations in the leaflet and supporting tissue. In order to achieve this, the heart valves rely of their unique macroscale anatomy, histoarchitecture and ultrastructural features that allow them to accommodate repetitive changes in shape and dimension throughout the cardiac cycle. This chapter is focused on the structure-function relationship of the heart valves, with particular focus on the aortic and mitral valves, discussing how the biochemical, histoarchitectural and anatomical features influence valvular function during the cardiac cycle and how valvular function dictates valvular architecture and ECM constitution.

Structure of the Heart

It works by regulating nerve impulses in your heart. Amiodarone is mainly given to patients who have not responded to other antiarrhythmic medicines. The test lets doctors measure the blood flow and blood pressure in the heart chambers and see if the coronary arteries are blocked. ARVD causes ventricular arrhythmias. Also called a total artificial heart TAH. A resting heart rate is normally 60 to beats a minute. Used in angioplasty or valvuloplasty.

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. The heart is located in between the two lungs. It lies left of the middle of the chest. Structure of the Heart The heart is a muscle about the size of a fist, and is roughly cone-shaped.


PDF | Structure and function in any organ are inseparable categories, both in health and disease. Whether we are ready to accept, or not, many.


Раздался телефонный звонок. Директор резко обернулся. - Должно быть, это Стратмор. Наконец-то, черт возьми. Бринкерхофф поднял трубку: - Канцелярия директора.

Беккер посмотрел на нее внимательнее. К ней как-то не шло сквернословие - как неуместны сточные воды в хрустальном графине. Но, приглядевшись, он убедился, что она вовсе не такая изысканная особа, как ему показалось вначале. Веки припухли, глаза красные, левая рука у локтя - вся в кровоподтеках с синеватым отливом. Господи Иисусе, - подумал .

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Сьюзан протянула карточку и приготовилась ждать обычные полминуты.

Она посмотрела на беретту и внезапно почувствовала тошноту. - Вы действительно собираетесь пристрелить Грега Хейла. - Нет.  - Стратмор хмуро посмотрел на нее и двинулся к двери.  - Но будем надеяться, что он этого не узнает.

Нет. Сьюзан словно окаменела, ничего не понимая. Эхо выстрела слилось с царившим вокруг хаосом. Сознание гнало ее вперед, но ноги не слушались. Коммандер.

Internal Structure of the Heart

Сказал Джабба.  - Вы же учились в колледжах. Ну, кто-нибудь.

 Видишь? - спросил Бринкерхофф, наклоняясь над ней и показывая цифру.  - Это СЦР. Миллиард долларов. Мидж хмыкнула.

Capillary Structure and Function in the Body

Одновременный подрыв этих тщательно замаскированных устройств должен был создать магнитное поле такой мощности, что вся информация на магнитных носителях - жестких дисках компьютеров, в постоянных запоминающих устройствах, в резервных файлах и даже на гибких дисках - оказалась бы стерта. Все данные, свидетельствующие о том, кто чем владел, должны были исчезнуть навсегда. Поскольку для одновременного подрыва устройств была необходима точнейшая координация действий, все эти изделия были связаны между собой телефонными линиями через Интернет. Двое суток встроенные часы устройств обменивались бесконечными потоками зашифрованной синхронизирующейся информации. АНБ, перехватывая эти информационные импульсы, игнорировало их, считая аномалией сети, безобидной тарабарщиной.

У пистолета куда большая дальность действия, чем у полутораметрового подсвечника. Халохот двигался быстро, но осторожно. Ступени были настолько крутыми, что на них нашли свою смерть множество туристов.

Cardiovascular system (heart) anatomy

Испанский Золотой век давным-давно миновал, но какое-то время в середине 1600-х годов этот небольшой народ был властелином мира. Комната служила гордым напоминанием о тех временах: доспехи, гравюры на военные сюжеты и золотые слитки из Нового Света за стеклом.

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