为您找到"
Heart
"相关结果约100,000,000个
heart, organ that serves as a pump to circulate the blood.It may be a straight tube, as in spiders and annelid worms, or a somewhat more elaborate structure with one or more receiving chambers (atria) and a main pumping chamber (ventricle), as in mollusks. In fishes the heart is a folded tube, with three or four enlarged areas that correspond to the chambers in the mammalian heart.
Learn about the heart, a muscular organ that pumps blood through the circulatory system. Find out how the heart is structured, how it works, and what can go wrong with it.
Heart conditions are among the most common types of disorders. In the United States, heart disease is the leading cause of death. Common conditions that affect your heart include: Arrhythmia: A heartbeat that's too fast, too slow or beats with an irregular rhythm.
Learn about the heart anatomy, blood flow and functions of this vital organ. The heart is a four-chambered, muscular pump that transports blood throughout the body via arteries, capillaries and veins.
Learn about the structure and function of your heart, including its chambers, valves, tissue, and blood flow. Find out how heart conditions can affect your health and how to prevent or treat them.
Learn about the structure and function of the heart, the organ that pumps blood through the body. Find out how blood flows through the heart and the cardiovascular system, and what can go wrong with congenital heart defects.
The normal heart is a strong, hard-working pump made of muscle tissue. It's about the size of a person's fist. The heart has four chambers. The upper two chambers are the atria, and the lower two are the ventricles (Figure A). The chambers are separated by a wall of tissue called the septum. Blood is pumped through the chambers, aided by four ...
Learn about the heart's structure, function, location, and diagram. The heart is a muscular organ that pumps blood through the body via the circulatory system. It has four chambers, four valves, and three layers of tissue.
Learn about the heart anatomy, a vital muscular organ that pumps blood through the body. Explore its external structure, chambers, valves, blood vessels, conduction system and more with diagrams and names.
Learn about the structure and function of the heart, the muscular organ that pumps blood and oxygen throughout the body. The heart has four chambers, two atria and two ventricles, separated by valves and surrounded by a sac called the pericardium.