Human Heart

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Pulmonary circulation is the half portion of the cardiovascular system which carries oxygen-depleted blood away from the heart, to the lungs, and returns oxygenated (oxygen-rich) blood back to the heart. What is the largest blood vessel leaving in the heart

The Aorta. It is an artery (arteries move blood away from the heart), and is the largest vessel in the human body. What organ or muscles do renal artery, pulmonary artery and coronary artery bring blood? renal=kidneys

heartbeat /heart·beat/ (hahrt´bēt) a complete cardiac cycle, during which the electrical impulse is conducted and mechanical contraction occurs. Dorland's Medical Dictionary for Health Consumers. © 2007 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

heart·beat (härtbt)n.A single complete pulsation of the heart.| The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

a complete cycle of cardiac muscle contraction and relaxation. Mosby's Medical Dictionary, 8th edition. © 2009, Elsevier.

heartbeat [hahrt´bēt]
the cycle of contraction of the heart muscle; it begins with an electrical impulse in the sinoatrial node, which serves as the normal pacemaker for the heart. Pulse: The rhythmic dilation of an artery that results from beating of the heart. Pulse is often measured by feeling the arteries of the wrist or neck. pulse

1  [puhls]  Show IPA noun, verb, pulsed, puls·ing.
the regular throbbing of the arteries, caused by the successive contractions of the heart, especiallyas may be felt at an artery, as at the wrist. 2.
a single pulsation, or beat or throb, of the arteries or heart. Blood pressure: The blood pressure is the pressure of the blood within the arteries. It is produced primarily by the contraction of the heart muscle.  A lymph node is an oval-shaped organ of the immune system, distributed widely throughout the body including the armpit and stomach and linked by lymphatic vessels. Lymph nodes are garrisons of B, T, and other immune cells. Lymph nodes act as filters or traps for foreign particles and are important in the proper functioning of the immune system. They are packed tightly with the white blood cells called lymphocytes and macrophages. -------------------------------------------------

The lymph fluid inside of the lymph nodes contains lymphocytes, a type of white blood cell, which are continuously recirculated through the lymph nodes and the bloodstream. Molecules found onbacteria cell walls or chemical substances secreted from bacteria, called antigens, may be taken up by dedicated antigen presenting cells such as dendritic cells into the lymph system and then into lymph nodes. In response to the antigens, the lymphocytes in the lymph node make an antibody which will go out of the lymph node into circulation, seek, and target the pathogen producing the antigen by targeting it for destruction by other cells and complement. Other immune system cells will be made to fight the infection and "sent" to the lymph nodes.[clarification needed] The increased numbers of immune system cells fighting the infection will make the node expand and become "swollen."

What is the function of tissue fluid?
Tissue fluid accomplishes many functions necessary for the body's cells to survive and work together. The first is support. Cells suspended in fluid are protected from damage caused by the vibrations of an animal's movement. More importantly, tissue fluid acts as a medium for cells to send chemical messages to one another. A related function is that the fluid acts as a waste disposal system for every cell it surrounds. Human heart

Human Heart Diagram

This human heart diagram shows the most powerful muscle in the human body. It is made up of a special type of muscle called myocardium which occurs nowhere else in the body.

The heart...
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