described the anatomy of human heart and associated with blood vessels
Answers
Answer:
Blood vessels form the living system of tubes that carry blood both to and from the heart. All cells in the body need oxygen and the vital nutrients found in blood. Without oxygen and these nutrients, the cells will die. The heart helps to provide oxygen and nutrients to the body's tissues and organs by ensuring a rich supply of blood.
Not only do blood vessels carry oxygen and nutrients, they also transport carbon dioxide and waste products away from our cells. Carbon dioxide is passed out of the body by the lungs; most of the other waste products are disposed of by the kidneys. Blood also transports heat around your body.
The heart is a fist-sized organ which lies within the chest behind the breastbone (sternum). The heart sits on the main muscle of breathing (the diaphragm), which is found beneath the lungs. The heart is considered to have two 'sides' - the right side and the left side.
The heart has four chambers - an atrium and a ventricle on each side. The atria are both supplied by large blood vessels that bring blood to the heart (see below for more details). Atria have special valves that open into the ventricles. The ventricles also have valves but, in this case, they open into blood vessels. The walls of the heart chambers are made mainly of special heart muscle. The different sections of the heart have to squeeze (contract) in the correct order for the heart to pump blood efficiently with each heartbeat.
Answer:
The heart is a muscular pump that pushes blood through blood vessels around the body. The heart beats continuously, pumping the equivalent of more than 14,000 litres of blood every day through five main types of blood vessels: arteries, arterioles, capillaries, venules and veins.
What are the heart and blood vessels?
Blood vessels form the living system of tubes that carry blood both to and from the heart. All cells in the body need oxygen and the vital nutrients found in blood. Without oxygen and these nutrients, the cells will die. The heart helps to provide oxygen and nutrients to the body's tissues and organs by ensuring a rich supply of blood.
Not only do blood vessels carry oxygen and nutrients, they also transport carbon dioxide and waste products away from our cells. Carbon dioxide is passed out of the body by the lungs; most of the other waste products are disposed of by the kidneys. Blood also transports heat around your body.
Where are the heart and blood vessels found?
The heart is a fist-sized organ which lies within the chest behind the breastbone (sternum). The heart sits on the main muscle of breathing (the diaphragm), which is found beneath the lungs. The heart is considered to have two 'sides' - the right side and the left side.
The heart has four chambers - an atrium and a ventricle on each side. The atria are both supplied by large blood vessels that bring blood to the heart (see below for more details). Atria have special valves that open into the ventricles. The ventricles also have valves but, in this case, they open into blood vessels. The walls of the heart chambers are made mainly of special heart muscle. The different sections of the heart have to squeeze (contract) in the correct order for the heart to pump blood efficiently with each heartbeat.
What do the heart and blood vessels do?
The heart's main function is to pump blood around the body. Blood carries nutrients and waste products and is vital to life. One of the essential nutrients found in blood is oxygen.
The right side of the heart receives blood lacking oxygen (deoxygenated blood) from the body. After passing through the right atrium and right ventricle this blood is pumped to the lungs. Here blood picks up oxygen and loses another gas called carbon dioxide. Once through the lungs, the blood flows back to the left atrium. It then passes into the left ventricle and is pumped into the main artery (aorta) supplying the body. Oxygenated blood is then carried though blood vessels to all the body's tissues. Here oxygen and other nutrients pass into the cells where they are used to perform the body's essential functions.
A blood vessel's main function is to transport blood around the body. Blood vessels also play a role in controlling your blood pressure.
Blood vessels are found throughout the body. There are five main types of blood vessels: arteries, arterioles, capillaries, venules and veins.
Arteries carry blood away from the heart to other organs. They can vary in size. The largest arteries have special elastic fibres in their walls. This helps to complement the work of the heart, by squeezing blood along when heart muscle relaxes. Arteries also respond to signals from our nervous system, either tightening (constricting) or relaxing (dilating).
Arterioles are the smallest arteries in the body. They deliver blood to capillaries. Arterioles are also capable of constricting or dilating and, by doing this, they control how much blood enters the capillaries.
Capillaries are tiny vessels that connect arterioles to venules. They have very thin walls which allow nutrients from the blood to pass into the body tissues. Waste products from body tissues can also pass into the capillaries. For this reason, capillaries are known as exchange vessels.
Groups of capillaries within a tissue reunite to form small veins called venules. Venules collect blood from capillaries and drain into veins.
Veins are the blood vessels that carry blood back to the heart. They may contain valves which stop blood flowing away from the heart