Postural Hypotension or Orthostatic Hypotension
Dizziness when standing occurs due to low blood pressure. The body is at rest and upon standing the heart needs to pump faster to supply more pressure. The dizziness is the moment leading up to when the proper blood pressure is reached. This is not normally something to be concerned about. However if it continues to happen, you should get your blood pressure checked at your doctor.
The highest pressure against the blood vessels is Systolic Pressure, and it occurs when the ventricles contract.
In my hospital it's called postural hypotension.
No, this blood pressure is actually within the new guidelines for optimum blood pressure (110/70). A blood pressure that is too low would be symptomatic, such as feinting or lightheadedness when standing.
Blood pressure drops as dilation increases. This occurs because of decrease resistance.
Sudden change in blood pressure.
What occurs as blood moves away from the heart? pulse decreases blood pressure increases pulse increases blood pressure decreases
head neck
In most cases, body position has very little effect on blood pressure. In many cases, the blood pressure will rise a little as a result of the heart rate going up when sitting or standing compared to lying down. Some people have an imbalance in their Autonomic Nervous System, which controls constriction and dilation of blood vessels and may find that their blood pressure is lower when standing as opposed to when lying down or sitting.
If you mean, what is the lowest blood pressure, then the answer is around 60 in an average person. Blood pressure is relatively consistent through out the body, so the lowest pressure would be seen when the heart is resting (also know as diastolic blood pressure).
In blood pressure nomenclature, where blood pressure is denoted xxx/yy, "xxx" is called the systolic blood pressure, whereas "yy" is called the diastolic blood pressure. A normal average blood pressure is 120/80, across the population. Yours may be slightly higher or lower than this average.
The normal blood pressure for a standing horse is 120/70 mmHg, however this may vary between different horses.