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Medical Physics Chapter 6: Pressure

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Questions and Answers

What is the classical method of measuring pressure in the body?

Determining the height of a column of liquid that produces a pressure equal to the pressure being measured.

What is the common clinical instrument used to measure blood pressure?

Sphygmomanometer

What fluid is commonly used in a U-shaped manometer to measure pressure?

Mercury

How much cerebrospinal fluid (CSF) does the brain contain?

Approximately 150 cm3 Signup and view all the answers

What are the two main reasons for the increased pressure inside the GI system?

Accumulation of food and swallowing air during eating Signup and view all the answers

Name three external factors that can increase the pressure inside the stomach.

Belts, girdles, flying Signup and view all the answers

What is the main reason for the pressure in the skeletal system being naturally reduced?

The shape of the bones, the large area of the joints, and the lubrication by synovial fluid Signup and view all the answers

What are the internal factors contributing to the pressure in the urinary bladder?

Accumulation of urine inside the bladder Signup and view all the answers

What is pressure?

Pressure is defined as the force per unit area in gas or a liquid. Signup and view all the answers

How is pressure under a column of liquid calculated?

The pressure (P) under a column of liquid can be calculated using the formula P = ρgh, where ρ is the density of the liquid, g is the acceleration due to gravity, and h is the height of the column. Signup and view all the answers

What is absolute pressure and how is it calculated?

Absolute pressure is the pressure reading plus atmospheric pressure. It is calculated by adding the pressure reading to the atmospheric pressure. Signup and view all the answers

What is negative pressure and provide an example?

Negative pressure is pressure lower than atmospheric pressure. An example is the pressure in the lungs during breathing, which must be negative to allow air to flow in. Signup and view all the answers