hypertension
2006-08-02 04:44:28 · 2 answers · asked by anne_fraisse 1 in Science & Mathematics ➔ Medicine
Oh! Let me do my best to explain:
Blood pressure is the force which blood has to push against arteries.
Normal blood pressure requires:
Normal peripheric resistance of arteries
Normal heart rate
Normal volume of blood.
Peripheric resistance is regulated by substances as angiotensin 2, adrenalin, etc, and a good state of the blood vessels. Arteriosclerosis can affect permanently the peripheric resistance for example.
Heart rate is regulated by the vagus and acetylcholin, which decreases it, or adrenalin which increases it.
Volume of blood is regulated by ADH mostly. Renal failure can affect the volume and increase blood pressure.
The cause of hypertension is not very known. There are some secondary causes that can explain it, such as a pheocromocitoma but the main cause is not discovered yet...
2006-08-02 06:29:26 · answer #1 · answered by mbestevez 7 · 0⤊ 0⤋
Let's keep it simple .... if your arteries are narrowed by disease, you will get hypertension because the blood is forced through a smaller space, thus increasing your blood pressure. Stress causes the blood vessels to constrict also which may create temporary high blood pressure.
2006-08-05 22:30:57 · answer #2 · answered by shadhag42 2 · 0⤊ 0⤋