5 Major Functions of the Cardiovascular System
The three main functions of the cardiovascular system. The cardiovascular system has three main functions: transport of oxygen, carbon dioxide and nutrients. The cardiovascular system consists of the heart, blood vessels, and blood. This system has three main functions: Transport of nutrients, oxygen, and hormones to cells throughout the body and removal of metabolic wastes (carbon dioxide, nitrogenous wastes).. Protection of the body by white blood cells, antibodies, and complement proteins that circulate in the blood and defend the body against.
The cardiovascular system has three main functions:. In the heat, blood vessels close to the surface of the skin enlarge. This process is called vasodilation. This allows more heat to be lost from the blood.
When a person takes part in exercise their face can become pink due to vasodilation of the blood vessels close to the skin's surface. In the cold, blood vessels at the skin's surface close. This process is called vasoconstriction and takes blood away from the surface of the skin to help prevent it from losing heat. When the heart contracts it pushes blood into blood vessels which creates blood pressure. A blood pressure reading consists of two values:.
The first number is the systolic value and the second number is the diastolic value. Blood pressure is determined by Q cardiac output and the resistance to the blood flow R. Resistance to blood flow is caused both by the diameter of the blood vessels and by the thickness of the blood. Furthermore, if a person has a condition called atherosclerosis plaque in the arteriestheir resistance to blood flow will increase and so will blood pressure.
This can have serious health implications such as causing chronic high blood pressure, angina or even heart attack or stroke. The heart's function is to pump the blood and circulate it round the body. We assess the heart's performance by measuring how much blood it pumps out each minute. This is called cardiac output. To calculate cardiac output, we also need to know about heart rate and stroke volume.
Heart rate HR is the number of times the heart beats or the ventricles pump blood out in one minute. The average resting HR is approximately 70 beats per minute bpm. Stroke volume SV is the amount of blood pumped out of the ventricles each time they contract. The average resting SV is approximately 70 ml. Cardiac output Q is the amount of blood pumped from the heart every minute and can be calculated by multiplying heart rate HR by stroke volume SV. SV is 70 to 90 millilitres at rest.
The fitter you are, the larger your stroke volume. We can calculate a typical cardiac output at rest and during exercise:. The three main functions of the cardiovascular system The cardiovascular system has three main functions: transport of oxygen, carbon dioxide and nutrients clotting how to go live on twitch open wounds regulation of body temperature Regulating body temperature In the heat, blood vessels close to the surface of the skin enlarge.
The four major functions of the cardiovascular system are: 1. To transport nutrients, gases and waste products around the body 2. To protect the body from infection and blood loss 3. To help the body maintain a constant body temperature (‘thermoregulation’) 4. To help maintain fluid balance within the body. 1. Transportation of nutrients, gases and waste products. Apr 07, · The cardiovascular system supports every other function in our bodies. From the way we move to the fact that our brain gets enough oxygen, we have the cardiovascular system to thank. The cardiovascular system includes the heart and all the vessels and arteries that branch out from it, delivering blood and oxygen to every inch of our bodies. Jun 03, · The cardiovascular system (which includes the heart, arteries, veins, capillaries, and blood) serves several major functions that are necessary for life. Major functions of the cardiovascular system are: 1) Transport of nutrients, oxygen, and hormones to cells through out the body and removal of metabolic wastes (carbon dioxide and nitrogenous wastes).
The cardiovascular system, also known as the circulatory system, includes the heart, arteries, veins, capillaries and blood. The heart functions as the pump that moves blood through the body. The arterial circulation delivers blood from the heart to the body, and the venous circulation carries it back to the heart. Capillaries are tiny blood vessels at the interface of the arterial and venous circulation where exchange of substances between the blood and body tissues occurs. The cardiovascular system serves several major functions that are necessary for life.
Supplying oxygen to the body is the most essential function of the cardiovascular system. Although all cells require oxygen, brain cells are the most sensitive and begin to die in as little as 3 minutes if deprived of oxygen. During inhalation, air enters the lungs and oxygen is absorbed through the air sacs into the bloodstream. This oxygen-rich blood is pumped through the heart into the arterial circulation.
In the capillaries, oxygen diffuses out of the blood and into the cells of the body's organs and tissues. At the same time, carbon dioxide -- a waste product produced by cells -- is absorbed into the blood and transported to the lungs through the venous circulation. When this oxygen-poor blood reaches the lungs, carbon dioxide diffuses through the air sacs and is then exhaled.
This cycle occurs with every breath. Delivering nutrients to the body is another critical function of the cardiovascular system. After food is digested in the stomach and intestines, its component nutrients are absorbed into the bloodstream. These nutrients include sugars, fats, vitamins, minerals and protein building blocks called amino acids. Each of these nutrients is vital to healthy body function. For example, the sugar glucose is the body's primary fuel to generate energy, and amino acids enable the body to manufacture new cells.
Like oxygen, nutrients diffuse from the bloodstream into body cells via the capillaries. In addition to carbon dioxide, the circulatory system picks up metabolic waste products and toxins and transports them to the liver, kidneys and lungs for eventual elimination from the body. The circulatory system serves as the highway for disease-fighting cells and proteins, and messengers of the immune system.
Immune system cells called white blood cells patrol the body in search of invading germs. If an infection occurs, these cells send chemical alarm signals that travel through the bloodstream, which subsequently transports infection-fighting cells to the site of the infection.
The circulatory system also carries chemical messengers that attract cells to heal tissues that have been damaged due to injury or disease. Hormones are chemical messengers produced by endocrine glands that affect distant organs. The cardiovascular system serves as the transportation connection between the endocrine glands and the organs or tissues they control via hormones. For example, hormones produced in the pituitary gland in the brain control other endocrine glands -- such as the thyroid, ovaries and testes -- as well as directing childhood growth.
Similarly, the blood-sugar-lowering hormone insulin produced in the pancreas affects the uptake and use of blood sugar throughout the body. And thyroid hormones affect the metabolic rate of virtually every body organ and tissue, thanks to their body-wide delivery via the circulatory system. Body temperature regulation is an often overlooked but important function of the cardiovascular system. Optimal function of the human body occurs within a relatively narrow temperature range, which is tightly regulated.
If body temperature begins to rise, blood vessels close to the body surface dilate, increasing in size. This allows the body to rid itself excess heat through the skin. Conversely, if body temperature drops, surface blood vessels constrict to conserve body heat. The cardiovascular system works in concert with the body's sweating mechanism as the primary regulators of body temperature.
Matthew Busse. Matthew Busse has pursued professional health and science writing since , writing for national publications including "Science Magazine," "New Scientist" and "The Scientist. The heart is the core of the cardiovascular system. Oxygen and Carbon Dioxide Transport. Nutrient and Waste Product Transport. Disease Protection and Healing. Hormone Delivery.
Body Temperature Regulation. Reviewed by: Tina M. John, M.