The Cardiovascular System Flashcards
What are the three functions of the cardiovascular system
Clotting, transport, temperature regulation
What is clotting
Platelets in the blood form clots, this seals wounds quickly and protects the body against excessive bleeding
What is transport (in the cardiovascular system)
Blood Carries oxygen and nutrients for the body work. It also carries waste products away
What is temperature regulation
When the body maintains temperature by controlling the internal lumen
When your too hot vasodilation increase blood flow to the skin to cool you down so you don’t overheat
What are the three main parts the cardiovascular system is made up of
The heart, blood and blood vessels
What is systole
When the heart contracts
What is diastolic
When the heart relaxes (refills with blood)
What is blood pressure
The pressure of blood against the walls of the blood vessels
Describe the route blood takes through the heart
- blood returns from the body through the superior vena cava and inferior vena cava
- Deoxygenated blood enters the right atrium
- Deoxygenated blood passes through the tricuspid valve into the right ventricle
- Deoxygenated blood is pumped through pulmonary arteries to the lungs. The semi-lunar valves prevent back flow
- Blood is oxygenated at the lungs
- Oxygenated blood returns to the heart through the pulmonary veins
- Oxygenated blood enters the left atrium
- Oxygenated blood passes through the bicuspid valve and into the left ventricle
- Oxygenated blood is pumped through the aorta to the muscles and organs. Semi- lunar valves prevent backflow
How do you work out cardiac output
Stroke volume x heart rate
What is stroke volume
The amount of blood pumped out of the heart per beat
What is heart rate
The number of times the heart beats per minute
What is cardiac output
The volume of blood pumped out of the heart per minute
What do white blood cells do
Travel in blood and fight of infection
What do red blood cells do
Transport oxygen
