Interactive Anatomy Guide. [Continued from above] . . .
Cardiac muscle tissue is made up of many interlocking cardiac muscle cells, or fibers, that give the tissue its properties. Each cardiac muscle fiber contains a single nucleus and is striated, or striped, because it appears to have light and dark bands when seen through a microscope. The dark bands represent areas of thick protein filaments made of myosin proteins that block light passing through the cell and appear dark.
Between the dark bands are thin filaments made of actin protein that allow light to pass through and appear light. Heart and Circulatory System. With each heartbeat, blood is sent throughout our bodies, carrying oxygen and nutrients to every cell.
Every day, the approximately 10 pints (5 liters) of blood in your body travel many times through about 60,000 miles (96,560 kilometers) of blood vessels that branch and cross, linking the cells of our organs and body parts. The Heart Click through this slideshow to learn about the heart. When blood circulates in the body, it enters the heart through the right atrium, passes through to the right ventricle, and flows out through the pulmonary artery to the lungs, where it picks up oxygen and gets rid of carbon dioxide.
From the lungs, blood returns to the left atrium and then enters the left ventricle, where it is pumped to the body through the aorta. Human Circulatory System - Diagram - How It Works. The circulatory system consists of three independent systems that work together: the heart (cardiovascular), lungs (pulmonary), and arteries, veins, coronary and portal vessels (systemic).
The system is responsible for the flow of blood, nutrients, oxygen and other gases, and as well as hormones to and from cells. Prehistoric Van Goghs: Artists Used Pointillism 38,000 Years Ago Nineteenth-century artists, such as Georges Seurat and Vincent van Gogh, weren't the first to use pointillism, according to a discovery of 38,000-year-old decorated limestone tablets in France. Cardiovascular System - Human Veins, Arteries, Heart. [Continued from above] . . .
The Heart The heart is a muscular pumping organ located medial to the lungs along the body’s midline in the thoracic region. The bottom tip of the heart, known as its apex, is turned to the left, so that about 2/3 of the heart is located on the body’s left side with the other 1/3 on right. The top of the heart, known as the heart’s base, connects to the great blood vessels of the body: the aorta, vena cava, pulmonary trunk, and pulmonary veins. Circulatory LoopsThere are 2 primary circulatory loops in the human body: the pulmonary circulation loop and the systemic circulation loop. Pulmonary circulation transports deoxygenated blood from the right side of the heart to the lungs, where the blood picks up oxygen and returns to the left side of the heart. Heart and Circulatory System. Listen Problems of the Heart and Circulatory System Problems with the cardiovascular system are common — more than 64 million Americans have some type of cardiac problem.
But cardiovascular problems don't just affect older people — many heart and circulatory system problems affect children and teens, too. Heart and circulatory problems are grouped into two categories: congenital (problems present at birth) and acquired (problems developed some time after birth). Congenital heart defects. Circulatory System: Facts, Function & Diseases. The circulatory system is a vast network of organs and vessels that is responsible for the flow of blood, nutrients, hormones, oxygen and other gases to and from cells.
Without the circulatory system, the body would not be able to fight disease or maintain a stable internal environment — such as proper temperature and pH — known as homeostasis. While many view the circulatory system, also known as the cardiovascular system, as simply a highway for blood, it is made up of three independent systems that work together: the heart (cardiovascular); lungs (pulmonary); and arteries, veins, coronary and portal vessels (systemic), according to the U.S National Library of Medicine (NLM). In the average human, about 2,000 gallons (7,572 liters) of blood travel daily through about 60,000 miles (96,560 kilometers) of blood vessels, according to the Arkansas Heart Hospital. Prehistoric Van Goghs: Artists Used Pointillism 38,000 Years Ago.