First of all I have to say I have really confused myself on this one by overthinking and I'll ask my questions step by step. Any help would be greatly appreciated. General rule is when blood vessels constrict blood pressure increases. 1. Ok there is a container and gas molecules in it. If I decrease the volume of the container the pressure increases. This analogy can not be used for blood vessels right? I mean it is a liquid and has a blood flow. 2. It is said that when blood vessels constrict blood pressure increases. Blood pressure means the pressure at which the heart pumps the blood right? So when they say an increase do they mean an increase in blood pressure overall(increase in heartbeat) or just at the place where blood vessel was constricted? I mean does a contraction of one vessel increase the overall heart beat or just the pressure of that vessel? 3.Why does blood pressure increase when blood vessels constrict? Is it because that when blood vessels constrict there is an increase in resistance and sensory neurones tell heart to increase blood pressure? If heart did not have sensory neurones and was unable to change its pumping rate willl the constriction of blood vessel decrease pressure? 4. Now how does this all apply when you consider heart as a network of vessels. Does it work like a circuit? If you have two branches and if one branch was dilated, more blood would follow the dilated branch right (path of least resistance), in this case how is there a more blood flow to that branch if heart decreases pressure. I mean isn't more blood countered by low pressure so no change. Thank you so much for anyone who is going to attempt to answer these for me.