Functions of the Heart The functions of the heart are as follows:
Functions of the Heart The functions of the heart are as follows: Variations in the rate and force of heart contraction match blood flow to the changing metabolic needs of the tissues during rest, exercise, and changes in body position.
Contractions of the heart produce blood pressure, which is needed for blood flow through the blood vessels. Securing one-way blood flow. The valves of the heart secure a one-way blood flow through the heart and blood vessels.
The heart separates the pulmonary and systemic circulations, which ensures the flow of oxygenated blood to tissues. Anatomy of the Heart The cardiovascular system can be compared to a muscular pump equipped with one-way valves and a system of large and small plumbing tubes within which the blood travels.
Heart Structure and Functions The modest size and weight of the heart give few hints of its incredible strength.
Snugly enclosed within the inferior mediastinum, the medial cavity of the thorax, the heart is flanked on each side by the lungs.
Its broad posterosuperior aspect, or base, from which the great vessels of the body emerge, points toward the right shoulder and lies beneath the second rib. The heart is enclosed in a double-walled sac called the pericardium and is the outermost layer of the heart.
The loosely fitting superficial part of this sac is referred to as the fibrous pericardium, which helps protect the heart and anchors it to surrounding structures such as the diaphragm and sternum.
Deep to the fibrous pericardium is the slippery, two-layer serous pericardium, where its parietal layer lines the interior of the fibrous pericardium.
Layers of the Heart The heart muscle has three layers and they are as follows: The epicardium or the visceral and outermost layer is actually a part of the heart wall.
The myocardium consists of thick bundles of cardiac muscle twisted and whirled into ringlike arrangements and it is the layer that actually contracts.
The endocardium is the innermost layer of the heart and is a thin, glistening sheet of endothelium hat lines the heart chambers. Chambers of the Heart The heart has four hollow chambers, or cavities: The two superior atria are primarily the receiving chambers, they play a lighter role in the pumping activity of the heart.
The two inferior, thick-walled ventricles are the discharging chambers, or actual pumps of the heart wherein when they contract, blood is propelled out of the heart and into the circulation. The septum that divides the heart longitudinally is referred to as either the interventricular septum or the interatrial septum, depending on which chamber it separates.
Associated Great Vessels The great blood vessels provide a pathway for the entire cardiac circulation to proceed. Superior and inferior vena cava. The heart receives relatively oxygen-poor blood from the veins of the body through the large superior and inferior vena cava and pumps it through the pulmonary trunk.
The pulmonary trunk splits into the right and left pulmonary arteries, which carry blood to the lungs, where oxygen is picked up and carbon dioxide is unloaded.
The adult human skeletal system consists of bones, as well as a network of tendons, ligaments and cartilage that connects them. The skeletal system performs vital functions — support. Working on memorizing the names of the bones? Make it more fun – Check out these songs! Give Me Some Bones The first of two bone songs, this song covers a bit of bone physiology and nomenclature for the axial skeleton. The accompanying lyric sheet uses color changes to indicate nomenclature for a new section Continue reading "Songs to learn the skeletal system". Histology Study Guide Cardiovascular System. These notes are an ancillary resource, NOT a substitute for scheduled resource sessions or for textbooks.
Oxygen-rich blood drains from the lungs and is returned to the left side of the heart through the four pulmonary veins. Blood returned to the left side of the heart is pumped out of the heart into the aorta from which the systemic arteries branch to supply essentially all body tissues. Heart Valves The heart is equipped with four valves, which allow blood to flow in only one direction through the heart chambers.
Atrioventricular or AV valves are located between the atrial and ventricular chambers on each side, and they prevent backflow into the atria when the ventricles contract. The left AV valve- the bicuspid or mitral valve, consists of two flaps, or cusps, of endocardium.
The right AV valve, the tricuspid valve, has three flaps. The second set of valves, the semilunar valves, guards the bases of the two large arteries leaving the ventricular chambers, thus they are known as the pulmonary and aortic semilunar valves.
Cardiac Circulation Vessels Although the heart chambers are bathed with blood almost continuously, the blood contained in the heart does not nourish the myocardium.
2 NASM-CPT Study Guide Joint receptors—respond to pressure, acceleration, and deceleration of joints. Golgi tendon organs (GTO)—sense changes in muscular tension. Muscle spindles—sense changes in muscle length. The Muscular System. 1 Human Anatomy and Physiology I Laboratory Microscopic Anatomy and Organization of Skeletal Muscle This lab involves study of the laboratory exercise “Microscopic Anatomy and Organization of Skeletal Muscle”, completing the Review Sheet for the exercise, and taking the relevant quiz. Human Anatomy Study Guide The Skeletal System: Chapter 6 Unit Objectives At the end of this unit, you should be able to 1) List the functions of the skeletal system. 2) Describe the anatomy of a long bone and identify its major internal and external features. 3) Contrast spongy bone and compact bone in terms of structure and function.
The coronary arteries branch from the base of the aorta and encircle the heart in the coronary sulcus atrioventricular groove at the junction of the atria and ventricles, and these arteries are compressed when the ventricles are contracting and fill when the heart is relaxed.
The myocardium is drained by several cardiac veins, which empty into an enlarged vessel on the posterior of the heart called the coronary sinus.
Blood Vessels Blood circulates inside the blood vessels, which form a closed transport system, the so-called vascular system.
As the heart beats, blood is propelled into large arteries leaving the heart. It then moves into successively smaller and smaller arteries and then into arterioles, which feed the capillary beds in the tissues.
Capillary beds are drained by venules, which in turn empty into veins that finally empty into the great veins entering the heart.Massage Prep Massage Therapy Training MBLEx Preparation LMT Certification Massage Therapy Certification MBLEx Test Questions Answers Massage Exam Leader in MBLEx Prep MBLEx Exam Test Questions Answers FSMTB MBLEx Massage Certifcation Test MBLEx Test Prep Online Federation of State Massage Therapy Boards MBLEx Study Guides Muscle Skeletal .
Skeletal System Study Guide Chapter Exam Instructions. Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To .
Learn how to apply kinesiology concepts and treat dysfunction with Muscolino’s Kinesiology: The Skeletal System and Muscle Function, 3rd Edition!With more than 1, full-color illustrations, this highly visual text offers a vividly illustrated look at the skeletal system and how muscles function as movers, antagonists, and stabilizers in the body.
Human Anatomy Study Guide The Skeletal System: Chapter 6 Unit Objectives At the end of this unit, you should be able to 1) List the functions of the skeletal system.
2) Describe the anatomy of a long bone and identify its major internal and external features. 3) Contrast spongy bone and compact bone in terms of structure and function.
The heart, blood, and blood vessels are the major components of the cardiovascular system. Like the bustling factory, the body must have a transportation system to carry its various cargos back and forth, and this is where the cardiovascular system steps in.
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