Deck 4 Functions of CV System Flashcards
List the 5 functions of the cardiovascular system
- Delivering oxygen and nutrients 2. Removing waste products (CO2 & lactate)3. Thermoregulation 4. Fighting infection 5. Clotting blood
Describe the function of delivering oxygen and nutrients
The key function of the CV system is to supply oxygen and nutrients to the tissues - via the bloodstream. During exercise we need more O2 and nutrients. when the CV system can no longer meet demands fatigue will occur. Aerobic performance will deteriorate however
Describe the function of removal of waste products?
As well as providing O2 and nutrients the circulatory system deals with waste!Waste products (lactic acid) is carried from the tissues to the kidneys and liver. Waste products (carbon dioxide) is carried from the tissue to the lungs. If these products are not removed fatigue will occur.
Describe the function of thermoregulation?
The distribution and redistribution of heat. Think ‘thermo’ like thermometer; heat/temperature. Helps us maintain thermal balance. Ensures we do not overheat during exercise. Thermoregulation occurs via two main processes:Vasoconstriction Vasodilation
Explain what happens during vasodilation?
With consideration given to blood vessels around the skin vasodilation increases the diameter of the vessels. There is a decrease in resistance to blood flow. More blood flows towards the skin and heat is lost via radiation. Body temperature decreases.
Explain what happens during vasoconstriction?
With consideration given to blood vessels around the skin vasoconstriction decreases the diameter of the vessels. There is an increase in resistance to blood flow. Less blood flows towards the skin and heat is trapped. Body temperature increases.
How do white blood cells fight infection?
WBC are constantly produced inside the bone marrow. They are stored in and transported around the body in the blood.They can identify consume and destroy pathogens (the substances that cause illness). White blood cells also help to produce antibodies that will also destroy pathogens. Antitoxins are produced to neutralise the toxins released by pathogens.
How does blood clotting occur?
Clotting is a complex process. When a blood vessel wall gets damaged it gets covered in fibrin. Fibrin is a fibre used to bind platelets together to form a clot.Platelets plug the site of the cut to stop any more blood from escaping.
