1. The function of the Cardiovascular system
P5/ M2

2. General function Heart Blood vessels
The main function of the cardiovascular system is to deliver oxygen and nutrients and remove the waste products of metabolism.
Each part of system has a specific function in helping to do this.
Heart
Pump – It is designed to push blood out through the arteries.
One ventricle pumps blood to the lungs to get oxygen
The other pumps blood to the body to deliver Oxygen and nutrients
Blood vessels
Designed to carry the blood. They are hollow, and vary according to their purpose.
For example, arteries have thick muscular walls so that they can take the blood at high pressure from the heart, and squeeze it along to the capillaries
Blood
Has a number of functions
Red blood cells and their haemoglobin attract Oxygen, so it can be carried around in the blood
White blood cells fight infection
Platelets help with clotting if we are injured.

3. Delivery of Oxygen and Nutrients
The key function of the CV system.
It is essential in football because....
Achieves this with the three elements working together.
The heart pumps the blood into the blood vessels
The blood vessels carry the blood to the body’s tissues
The blood carries a number of things dissolved in it.
For example:
Oxygen is carried by the haemoglobin in the red blood cells
Blood also carries nutrients that it has absorbed in the intestines to the working muscles
Why is this important to success in football?

4. Removal of Waste products
The other key function of the CV system….
Again all three elements work together to allow this to happen
The force of the pump from the heart helps to get the blood back
The blood vessels, particularly the veins use their proximity to muscles and their valves to squeeze the blood back to the heart, without any back flow
The blood carries the Carbon dioxide back to the lungs to be excreted
It also carries other waste from the metabolic process, such as water and lactic acid. This is taken back to the kidneys and liver so we can process it and excrete it.
Why is this essential to success in sport, and football in particular?

5. Thermoregulation
The ability to maintain body temperature within certain boundaries.
VASODILATION
Effectively during exercise, and when we are hot, the blood vessels redirect the blood closer to the surface, so that the hear can evaporate.
This is why we go red when we exercise.
On the other hand…
VASOCONSTRICTION
When we are cold, the blood vessels direct the blood away from the surface of the body, to keep our core temperature stable.
- This is why we appear more pale/blue when cold

6. Thermoregulation explained further…
Capillaries
Sweat gland
If the body gets too hot, capillaries near the surface of the skin widen. Blood is diverted to the skin where the heat can easily radiate away. This is called vasodilation.
Water from the blood is excreted as sweat to cool the body.
Thermoregulation explained further…
If the body gets too cold, capillaries near the surface of the skin get narrower. Blood is diverted away from the skin to limit heat loss. This is called vasoconstriction.
Sweating stops.

7. The effects of Training
Long term effects of exercise (3-5x 20 mins a week):
Decreased HR
Increased Stroke Volume
Heart muscles become bigger (HYPERTROPHY)
Fall in blood pressure
Increase in Red blood cell count
Increased size in blood vessels
Increased blood volume
Short term effects of exercise on the CV system (10 mins):
Increased HR
Increased Stroke Volume
Increased Cardiac Output
Redistribution of blood to the working muscles and away from other organs
Blood vessels in the skin dilate
Increased blood pressure

8. Describe the Structure and Function of the cardiovascular system
Examine the cardiovascular system and explain how it works and how each part of the system is designed to meet its function
Structure of the cardiovascular system (which you have to find pictures/ label and describe):
Heart:
Atria, Ventricles, Bicuspid valve, Tricuspid valve, Aortic valve, Pulmonary valve, Aorta, Vena cava – (superior and inferior), Pulmonary vein, Pulmonary artery
Blood vessels:
Arteries, Arterioles, Capillaries, Veins, Venuoles
Function of the cardiovascular system:
Delivery of oxygen and nutrients
Removal of waste products
Thermoregulation (vasodilation and vasoconstriction of vessels);
Function of blood (oxygen transport,
clotting, fighting infection)