Ventricular contraction and afterload

Question 1

what does the force of ventricular contraction depend on

Answer 1

preload and adrenoceptor-mediated contractility (b1 and b2 in myocardium)

Question 2

What is combination

Answer 2

force driving stroke volume

Question 3

what is the force opposing flow referred to as

Answer 3

afterload

Question 4

what is the index for afterload

Answer 4

aortic pressure