Which of the following refers to the ability of the heart cardio and circulatory system Vascular to?

The cardiovascular system is sometimes called the blood-vascular, or simply the circulatory, system. It consists of the heart, which is a muscular pumping device, and a closed system of vessels called arteries, veins, and capillaries. As the name implies, blood contained in the circulatory system is pumped by the heart around a closed circle or circuit of vessels as it passes again and again through the various "circulations" of the body.

As in the adult, survival of the developing embryo depends on the circulation of blood to maintain homeostasis and a favorable cellular environment. In response to this need, the cardiovascular system makes its appearance early in development and reaches a functional state long before any other major organ system. Incredible as it seems, the primitive heart begins to beat regularly early in the fourth week following fertilization.

The vital role of the cardiovascular system in maintaining homeostasis depends on the continuous and controlled movement of blood through the thousands of miles of capillaries that permeate every tissue and reach every cell in the body. It is in the microscopic capillaries that blood performs its ultimate transport function. Nutrients and other essential materials pass from capillary blood into fluids surrounding the cells as waste products are removed.

Numerous control mechanisms help to regulate and integrate the diverse functions and component parts of the cardiovascular system in order to supply blood to specific body areas according to need. These mechanisms ensure a constant internal environment surrounding each body cell regardless of differing demands for nutrients or production of waste products.

On this page

• What is the circulatory system?
• How does the circulatory system work?
• What are the common conditions related to the circulatory system?
• Related information on Australian websites

What is the circulatory system?

Your circulatory system, also called the cardiovascular system or vascular system, transports oxygen, nutrients and hormones to your body's cells to use for energy, growth and repair. Your circulatory system also removes carbon dioxide and other wastes your cells do not need.

These key parts of your circulatory system maintain blood flow to your body so you can survive:

• blood, made up of cells and plasma
• the heart, a muscular organ that pumps blood to all parts of your body
• blood vessels, a network of arteries, capillaries and veins to carry blood pumped by your heart

How does the circulatory system work?

Blood that is low in oxygen collects in your heart's right atrium, one of the heart’s 4 chambers.

It moves into the right ventricle, which pumps this blood to your lungs where your red blood cells pick up oxygen and get rid of carbon dioxide. You exhale the carbon dioxide.

The oxygen-rich blood returns to your heart's left atrium, then into your left ventricle. The left ventricle pumps oxygen-rich blood through your aorta, into your arteries, then to all parts of your body. Along the way, the blood gathers food nutrients from your small intestine. 

As it enters the capillaries, your blood makes close contact with tissues and cells. It delivers oxygen and nutrients and removes carbon dioxide and wastes. Now low in oxygen, the blood travels through the veins to return to your heart's right atrium, where the circuit starts all over again.

Cardiovascular disease

Cardiovascular disease (CVD) refers to all diseases of the heart and blood vessels.

Most CVD occurs when fatty substances, called plaque or atheroma, build up in the lining of blood vessels, causing them to narrow and allow less blood to pass through. This process is called atherosclerosis. 

Atherosclerosis causes coronary heart disease, also known as ischaemic heart disease. The slowing of the blood flow reduces the oxygen and nutrients available to the heart muscles. This can cause angina or a heart attack, which will require emergency medical attention. The most common symptom of heart attack or angina is chest pain.

When the supply of blood to part of the brain is interrupted because of a blocked or burst artery, a person will have a stroke. A stroke is also an emergency and will require urgent medical treatment.

Read more about heart problems and cardiovascular health here.

High or low blood pressure

As your heart pumps blood into your arteries, the blood pushes against the artery walls. This is what determines your blood pressure. Most doctors consider that a healthy blood pressure is higher than 90/60mm/Hg and lower than 140/90mm/Hg.

High blood pressure, also known as hypertension, can raise your risk of cardiovascular disease. It is the most common condition of the circulatory system. 

Low blood pressure, also known as hypotension, is a sign of good health for some people but can be a problem for others. If you have symptoms of low blood pressure, such as dizziness or fainting, you should see a doctor. 

Which of the following refers to the ability of the heart cardio and circulatory system Vascular to supply oxygen muscles?

Which of the refers to the ability of the heart cardio and circulatory system Vascular to supply oxygen to muscles for an extended period of time?

Which of the following refers to the ability of the heart and lungs to produce oxygen to different body parts?

Which of the following is the ability of the heart to supply oxygen to the muscles *?