Blood pressure is the force exerted against the

Blood pressure is the force that blood exerts when circulating through our body (if it is considered as a fluid) on the internal walls of veins, blood vessels and especially the arteries.

In this sense, arteries are the "conduits" that carry blood from the heart to various parts of the body, analogous to the water flow in the pipes of a house. So, each time a person's heart beats, it pumps blood to the arteries and from there it is distributed throughout the body.

Now, this blood pressure is divided into two terms:

Systolic pressure: When the heart is pumping blood and the force exerted on the arteries is high.

Diastolic pressure: When the heart is at rest (between heartbeats) and the pressure in the arterial walls is low.

Another important factor in blood pressure is the extent to which the arteries exert resistance to the circulation of the blood flow, depending on how narrow or wide they are and the amount of blood that passes through them.  

In other words, this pressure is determined by two main aspects:

-The amount of blood pumped and the force it exerts on the arteries.

-The size and flexibility of these arteries.

Finally, it is important to note this process is a basic part of life and is one of the main vital signs when testing the health status of a person.

c. newton's third law of motion

it doesn't. it was imagined up in the middle ages.