Control Of Heartbeat Flashcards
Where does the messages to the heart come from
The cerrabellum in the brain
Where does the message from the brain go to
The sinoatrial node (SAN)
Where is the signal from the brain passed
Passed over the top of the heart causing the atrium to contract
Why does the signal have a 0.1 second delay
To allow the atrium to empty of blood
How does the signal travel down the septum
In the Bundle of His
How is the signal carried round the sides of the heart
In Purkynefibres
What is the cardiac cycle
A heartbeat
What is cardiac output
Quantity of blood expelled from the heart in one minute
What is stroke volume
Quantity of blood expelled from the left ventricle in one beat
What is heart rate
The number of heartbeats in one minuge
How do you calculate cardiac output
Heart rate x stroke volume
What are the components of blood
White blood cells
Red blood cells
Plasma
Platelets
What are the two branches called that regulate your heart rate
Sympathetic and parasympathetic
What does the sympathetic do
Increases and strengthens heart rate
What does the parasympathetic do
Calms heart output
