Bbc bitesize cardiovascular system

An explanation of how the cardiovascular system works during exercise. Bbc bitesize cardiovascular system the heat, blood vessels close to the surface of the skin enlarge. This process is called vasodilation close vasodilation The increase in diameter of the skin arterioles to increase blood flow and increase heat loss by radiation. This allows more heat to be lost from the blood.

In the heat, blood vessels close to the surface of the skin enlarge. This process is called vasodilation close vasodilation The increase in diameter of the skin arterioles to increase blood flow and increase heat loss by radiation. 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 close vasoconstriction The narrowing of the skin arterioles to reduce blood flow and reduce heat loss by radiation.

Bbc bitesize cardiovascular system

The heart is working hard to pump blood around the body. Well, the blood has to be kept moving around all the time because it's the body's delivery system. Every possible part of the body has to be supplied with oxygen and food and water, and the veins and arteries are like roads going all the way through your body with the blood cells like delivery vans. So it's a good job we've got the circulatory system to transport nutrients, water and oxygen to the entire body. Your heart is a very strong muscle which contracts gets smaller and relaxes to pump blood around your body. A heart beat varies from person to person - for an average person it beats times a minute. You feel this when you feel your pulse. Check out the muscular heart and its extraordinary pumps. Watch and learn about the magnificent blood vessels in your body. Inside you, there is an amazing network of blood vessels, the tubes that carry blood all around your body. The blood vessels are a bit like roads going around a city with deliveries, while the veins take away waste.

This process is called vasodilation close vasodilation The increase in diameter of the skin arterioles to increase blood flow and increase heat loss by radiation. Blood vessels leading into and out of the heart.

Arteries close arteries An elastic, muscular-walled vessel taking blood away from the heart. This means it is under high pressure close high pressure Gases and liquids are under high pressure when their volume has been reduced and so they exert a force against the structure surrounding them. The walls of arteries are made of thick muscle to withstand this pressure. This muscle is also elastic to allow a pulse of blood to travel along when your heart beats. Veins close veins A somewhat elastic, muscular-walled vessel taking blood towards the heart. This blood is under lower pressure close low pressure Gases and liquids are under low pressure when their volume has increased and so they exert less force against the structure surrounding them.

The heart is working hard to pump blood around the body. Well, the blood has to be kept moving around all the time because it's the body's delivery system. Every possible part of the body has to be supplied with oxygen and food and water, and the veins and arteries are like roads going all the way through your body with the blood cells like delivery vans. So it's a good job we've got the circulatory system to transport nutrients, water and oxygen to the entire body. Your heart is a very strong muscle which contracts gets smaller and relaxes to pump blood around your body. A heart beat varies from person to person - for an average person it beats times a minute. You feel this when you feel your pulse. Check out the muscular heart and its extraordinary pumps. Watch and learn about the magnificent blood vessels in your body.

Bbc bitesize cardiovascular system

If you clench your hand into a fist, this is approximately the same size as your heart. It is located in the middle of the chest and slightly towards the left. The heart is a large muscular pump and is divided into two halves - the right-hand side and the left-hand side. The right-hand side of the heart is responsible for pumping deoxygenated blood to the lungs. The atria plural of atrium are where the blood collects when it enters the heart. The tricuspid valve is located between the right atrium and right ventricle and opens due to a build-up of pressure in the right atrium. The bicuspid valve is located between the left atrium and left ventricle and likewise opens due to a build-up of pressure, this time in the left atrium.

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Your heart is a very strong muscle which contracts gets smaller and relaxes to pump blood around your body. Furthermore, if a person has a condition called atherosclerosis plaque in the arteries , their resistance to blood flow will increase and so will blood pressure. The ventricle pumps the blood through the semilunar valve, into the aorta and round the body. The heart is a unidirectional pump. This can have serious health implications such as causing chronic high blood pressure, angina or even heart attack or stroke. Carries digested food glucose and amino acids from the liver around the body. This can have serious health implications such as causing chronic high blood pressure, angina or even heart attack or stroke. The average resting SV is approximately 70 ml. The cardiovascular system has four main functions:. In the cold, blood vessels at the skin's surface close. All vessels feature varying lumen size. The first number is the systolic value and the second number is the diastolic value. Structure of the cardiovascular system Structure of blood and blood vessels The main functions of the cardiovascular system.

Blood transports materials and heat around the body and helps to protect against disease. It contains:. You have about 5.

Heart - Lungs pick up oxygen - Heart again - Rest of your body to drop off the oxygen - Heart again. The cardiovascular system has three main functions:. Some cells do repairs if you get a cut. Watch: Blood. The first number is the systolic value and the second number is the diastolic value. Structure of the cardiovascular system Structure of blood and blood vessels The main functions of the cardiovascular system. Blood vessels leading into and out of the heart. The cardiovascular system has four main functions:. The average resting SV is approximately 70 ml. In this guide. The vena cava is the largest vein in the body. The average resting HR is approximately 70 beats per minute bpm. The three main functions of the cardiovascular system. Muscular system - Eduqas Skeletal system - Eduqas Cardio-respiratory system - Eduqas Aerobic and anaerobic exercise - Eduqas Long and short term effects of exercise - Eduqas Movement analysis in sport - Eduqas.