A3 Cardiovascular system Flashcards
How many chambers are there in the heart?
4
Name the structure labelled X
Coronary artery
Name the chamber labelled S
Right atrium
Name the structure labelled R
Right ventricle
Name the structure labelled P
Left atrium
Does chamber Q contain oxygenated or deoxygenated blood?
Oxygenated
Name the structure labelled X
Coronary artery
Name the blood vessel labelled C
Aorta
Name the blood vessel labelled B
Pulmonary vein
Name the blood vessel that returns blood from the body to the heart
Vena cava
Name blood vessel A
Pulmonary artery
Name the valve
Semi lunar valve
Name the valve labelled B
Bicuspid valve
Name the blood vessel labelled C
Aorta
Name the structure labelled D
Tricuspid valve
In which chamber is the SAN found?
Right atrium
What is the role of the SAN?
Acts as pacemaker
Initiates an electrical wave across the atria
List the structures involved in causing the cardiac muscle to contract
Sino atrial node
Atria walls
Atrioventricular mode
Bundle of His
Purkinjie fibres
What happens when a electrical wave passes over the atria?
Cardiac muscle in atria walls contract
Increase pressure in atria
Valve opens
Blood passes into ventricles
What does myogenic mean?
Cardiac muscle contracts
without the control of the nervous system
What is the role of the AVN?
Initiates an electrical impulse that travels down the Bindle of His to the purkinjie fibres
Causes ventricles to contract from the apex upwards
What happens to the pressure in the ventricles when the walls contract?
Pressure increases
When do the semi lunar valves open?
When the pressure in the ventricles exceeds the pressure in the pulmonary artery/aorta
When does the tricuspid valve open?
When the pressure in the right atrium is higher than the pressure in the right ventricle.
When does the biscupid valve close?
When the pressure in the left ventricle is higher than the left atrium
