Health Physics and Pressure Quiz
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Questions and Answers

What is the relationship described by Boyle's law?

Boyle's law states that for a fixed quantity of gas at a fixed temperature, the product of the absolute pressure and volume is constant (PV = constant).

How does the pressure in the lungs change underwater compared to at sea level?

The pressure in the lungs at any depth is greater than the pressure in the lungs at sea level.

What is the consequence of higher partial pressure of oxygen underwater?

The higher partial pressure of oxygen causes more oxygen molecules to be transferred into the blood, leading to oxygen poisoning if it gets too high.

Why is breathing air at a depth of 30 m dangerous?

<p>Breathing air at a depth of 30 m may result in excess nitrogen in the blood and tissues, leading to serious problems.</p> Signup and view all the answers

What is the purpose of the Eustachian tube in the context of diving?

<p>The Eustachian tube helps equalize pressure in the middle ear with the pressure outside the eardrum.</p> Signup and view all the answers

How does excess nitrogen in the blood and tissues affect the body?

<p>Excess nitrogen in the blood and tissues can lead to nitrogen narcosis, causing symptoms such as disorientation and impaired judgment.</p> Signup and view all the answers

What is the term used to define the force per unit area in gas or liquid?

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

How is pressure measured in the metric system?

<p>Dynes per square centimeter or newton’s per square meter</p> Signup and view all the answers

What is the most common method of indicating pressure in medicine?

<p>Height of column of mercury</p> Signup and view all the answers

Define absolute pressure and give an example of how it is calculated.

<p>Absolute pressure is the pressure reading plus atmospheric pressure. For example, pressure in tire + atm. pressure = Absolute pressure.</p> Signup and view all the answers

What is the term for the pressure in the tire?

<p>Gauge pressure</p> Signup and view all the answers

What is the formula to calculate the pressure under a column of liquid?

<p>P = ρgh</p> Signup and view all the answers

What is a manometer used for?

<p>Measuring pressure by determining the height of a column of liquid</p> Signup and view all the answers

What type of pressure can a U-shaped manometer measure?

<p>Both positive and negative pressures</p> Signup and view all the answers

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

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

How does a mercury-type sphygmomanometer indicate pressure?

<p>By the height of a column of mercury inside a glass tube</p> Signup and view all the answers

What happens in an aneroid-type sphygmomanometer when pressure changes?

<p>The shape of a sealed flexible container changes, causing a needle to move on a dial</p> Signup and view all the answers

What is the volume of cerebrospinal fluid (CSF) in the brain approximately?

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

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