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In a healthy young adult, the normal diastolic pressure is approximately 80 mm Hg. Diastolic pressure is the pressure in the arteries when the heart rests between beats.

Hypertension is defined as an increase in the blood pressure in the arteries. It is a severe condition which may lead to heart strokes. Normal blood pressure at rest is within the range of 100-140 mm Hg systolic (top reading) and 60-90 mm Hg diastolic (bottom reading). 

A sphygmomanometer is an instrument attached to an inflatable air bladder cuff and used with a stethoscope, for measuring blood pressure in an artery. It is estimated with reference to mmHg.

The instrument used for measuring blood pressure is known as sphygmomanometer. The blood pressure is measured in mm of Hg (millimetres of mercury) and recorded with systolic number first followed by diastolic. In a normal adult, BP is 120/80 mm Hg.

• Systolic pressure is the pressure in blood vessels or the force of blood against the wall of arteries when the ventricles pump out blood into them. It is about 120 mm Hg.
• Diastolic pressure is the pressure or the force of blood against the wall of arteries when the heart is relaxing and getting refilled with blood. It is about 80 mm Hg.

The adrenal glands, specifically through the secretion of hormones like aldosterone and adrenaline, play a critical role in regulating blood pressure. Aldosterone helps regulate blood volume by managing sodium and water retention.

Hypertension is generally defined as blood pressure consistently at or above 130/80 or 140/90 mm Hg. Among the choices, 140/100 represents a hypertensive reading.

Hypotension (low blood pressure) is often caused by fluid loss, blood loss, or endocrine issues. Excessive fluid intake would typically increase blood volume and potentially raise blood pressure rather than lower it.