The systolic blood pressure of normal human is about:

Blood pressure is a critical vital sign, indicating the force exerted by circulating blood against the walls of the body's arteries. It is measured in millimeters of mercury (mmHg) or torr, with 1 torr being equivalent to 1 mmHg. Blood pressure has two main components: systolic and diastolic.

• B: 120 torr (or 120 mmHg) is the correct answer. A normal systolic blood pressure for a healthy adult is typically around 120 mmHg. This represents the peak pressure when the heart contracts and pumps blood into the arteries.
• A: 100 torr is generally considered on the lower side of normal, potentially indicating hypotension (low blood pressure) for some individuals.
• C: 140 torr and D: 160 torr are elevated readings, indicating hypertension (high blood pressure), which is a significant risk factor for cardiovascular diseases.

Maintaining blood pressure within the normal range is essential for overall health.