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Function of the cardiovascular system
Transcript of Function of the cardiovascular system
Complete the diagram of the heart
Lesson Aim and Objective (s)
Aim - To be able to complete the merit of the CV system assignment
LO1 - Will be able to identify the main functions of the cardiovascular system (M2)
LO2 - Will be able to explain the main functions of the cardiovascular system (M2)
LO3 - Will be able to implement our learning/research into assignment 3
How is blood carried around the body?
Artery walls are made of smooth muscle and elastic tissues. They stretch when blood is pumped in. Smooth muscle contracts, forcing blood along
The thin walls of the capillaries allows oxygen and nutrients to pass from blood into cells
Waste products pass into the blood and into the venules
From venules, the blood flows into viens and onto the heart
1 - Delivery of oxygen and nutrients and removal of waste products
This network allows a non-stop courier system (the blood) to deliver nutrients and oxygen to the tissues of the body
Carries waste products from the tissues to the kidneys and the liver
Returns carbon dioxfrom the tissues to the lungs for them to exhale
The cardiovascular system acts as an internal road network, linking all parts of the body via a system of highways (arteries and veins), main roads (arterioles and venules) and streets, avenues and lanes (capillaries)
2 - Thermoregulation
Smooth muscle around arterioles
3 - Vasodilation and Vasoconstriction
Increases in temperature result in the smooth muscle in the walls of arterioles being stimulated to relax causing vasodilation (increase in diameter of the vessel). This increases the volume of blood flow to the skin, allowing cooling to occur.
Decreases in blood or skin temperture causes the arterioles to vasoconstrict (reduce their diameter), thus reducing the blood flow to the skin and therefore helping to maintain core body temperature.
4 - Function of blood
Blood is made up of four elements, which each perform a different function:
Red blood cells
– these carry oxygen around the body and remove carbon dioxide
White blood cells
– these help the body fight infection
– these tiny cell fragments trigger the process that causes the blood to clot (thicken) in order to protect a damaged blood vessel
– this yellow fluid transports blood cells and platelets around the body and contains a number of substances, including proteins
Well done, now complete the merit leaflet task for assignment 3!!!!!