What 2 parameters determine blood pressure and how are these related?!

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Blood pressure is a measurement of the force applied to the walls of the arteries as the heart pumps blood through the body. The pressure is determined by the force and amount of blood pumped, and the size and flexibility of the arteries.
Blood pressure is continually changing depending on activity, temperature, diet, emotional state, posture, physical state, and medication use.
Many factors can affect blood pressure, including:
* How much water and salt you have in your body
* The condition of your kidneys, nervous system, or blood vessels
* The levels of different body hormones
Atherosclerosis is a condition in which fatty material collects along the walls of arteries. This fatty material thickens, hardens (forms calcium deposits), and may eventually block the arteries. Eventually, the plaques can make the artery narrow and less flexible, making it harder for blood to flow.
Orthostatic hypotension is brought on by a sudden change in body position, usually when shifting from lying down to standing. This type of hypotension usually lasts only a few seconds or minutes. If this type of hypotension occurs after eating, it is called postprandial orthostatic hypotension.

http://www.nlm.nih.gov/medlineplus/ency/…
http://en.wikipedia.org/wiki/Blood_press…
http://www.nlm.nih.gov/medlineplus/ency/…
http://en.wikipedia.org/wiki/Hypertensio…
http://www.nlm.nih.gov/medlineplus/ency/…
http://en.wikipedia.org/wiki/Hypotension
http://www.nlm.nih.gov/medlineplus/ency/…
http://en.wikipedia.org/wiki/Atheroscler…