Lecture 8: The Heart as a Pump Flashcards
What circuit move blood to and from the lungs?
The Pulmonary circuit
What circuit moves blood to and from the tissues of the body?
The Systemic circuit
How many chambers of the heart are there?
Four
How many directions does blood flow in?
One
What direction does arterial blood flow in?
Away from the heart
What direction does Venous fluid flow in?
Towards the heart
How many pumps are in the heart and how can their location be described?
There are 2 pumps and they are in series
When pumping blood which pumps work together in synchronisation?
The left/right
When contracting what contracts first?
Atria
When the heart contracts what contracts second?
Ventricles
What controls the flow of blood between the Atria and ventricles?
Tricuspid and bicuspid (mitral) valves
atrioventricular valves
What controls the flow of blood from the ventricles out to the circulatory vessels?
Aortic and pulmonary valves
Semilunar valves
What are Thin filaments made of?
Actin
What are Thick filaments made of?
Myosin
What causes mysoin-actin cross bridges to form in cardiac muscle?
Calcium levels increasing