Heart dissection

Dissecting a heart, I see its chambers, muscle and things that make our heart a powerful pump. I wonder and question what makes it all work. How does the veins and artery branch from the heart into every part of your body, how and why is that. How is it that the blood flow moves against gravity, you could say the valves within the veins and I will ask you ‘how did it manage to get there’

Don’t worry professor, I am grasping the physiological functions and processes but on some level, I had to question how and why. No matter what one chooses to believe, in my view we cannot talk away God from the functioning of everything. He is God of everything including science and thankfully Math too!