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?

<p>Approximately 150 cm3</p> Signup and view all the answers

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

<p>Accumulation of food and swallowing air during eating</p> Signup and view all the answers

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

<p>Belts, girdles, flying</p> Signup and view all the answers

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

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

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

<p>Accumulation of urine inside the bladder</p> Signup and view all the answers

What is pressure?

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

How is pressure under a column of liquid calculated?

<p>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.</p> Signup and view all the answers

What is absolute pressure and how is it calculated?

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

What is negative pressure and provide an example?

<p>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.</p> Signup and view all the answers

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