PHYS 261 MIDTERM EXAM CORRECT DETAILED ANSWERS

PHYS 261 – MIDTERM EXAM CORRECT DETAILED ANSWERS

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What chemical "breaks" the surface tension in the surface of the lungs to allow compliance and elastance? - ANSWER ✔Surfactant Which part of the respiratory system produces surfactants?

• Alveoli Type 1
• Lungs
• Brochioles
• Alveoli Type II
• Capillaries Type II - ANSWER ✔d. Alveoli Type II

Describe Boyle's Law? - ANSWER ✔As volume increases, pressure decreases.As volume decreases, pressure increases.Which part of the respiratory system does 95% of the gas exchange function?

• Alveoli Type 1
• Lungs
• Brochioles
• Alveoli Type II
• Capillaries Type II - ANSWER ✔a. Alveoli Type 1

What chemical breaks the surface tension in the surface of lungs to allow compliance and elastance?

• Hormones
• Surtacfant
• Epinephrine
• Cyanide
• Surfactant - ANSWER ✔e. Surfactant

What happens to the pressure in alveoli during inspiration?

• Increases.
• Stays the same.
• Decreases then sharply decreases.
• Decreases
• Pressure doesn't change. - ANSWER ✔d. Decreases

Describe Dalton's Law? - ANSWER ✔The total pressure of a mixture of gasses = The total partial pressures of the gasses individually.What is alveolar ventilation? - ANSWER ✔The amount of air reaching alveoli per minute.If the doctor says that the pressure of the patient's alveoli is increasing, what is probably happening with the patient's respiration?

• The patient is inhaling naturally.
• The patient is hyper ventilating.
• The patient is exhaling naturally.
• The patient is holding his/her breath. 1 / 2

• The patient has a hole in their lungs. - ANSWER ✔c. The patient is exhaling naturally.

How to calculate the alveolar ventilation rate?

• TV-DV
• IRV-TLC
• DV-IRV
• ERV-IRV
• Dalton's Law * TV/DV - ANSWER ✔a. TV-DV (Total Volume - Dead Space Volume)

What is the difference between compliance and elastance? - ANSWER ✔Compliance = stretchable Elastance = ability to return to resting volume after compliance.What is the difference between high and low compliance? - ANSWER ✔High compliance = easy to stretch.Low compliance = hard to stretch.What is the name of the test used to measure lung function by measuring air volume inhalation, exhalation, and breathing rate?

• Spirotechics
• Speedometry
• Spiralmetrics
• Spirometry
• Spirology - ANSWER ✔Spirometry

How to calculate total pulmonary ventilation?

• Ventilation Rate x Spirometric Volume
• Tidal Volume x Total Volume
• Total Volume x Dalton's Law
• Ventilation Rate x Tidal Volume
• Ventialtion Rate x Resting Capacity - ANSWER ✔d. Ventilation Rate x Tidal Volume

What is the movement of air between the atmosphere and lungs?

• Compliance
• Gas exchange
• Respiration
• Perspiration
• Ventilation - ANSWER ✔e. Ventilation

What are tiny interconnected sacs in the lungs that serve as the site of gas exchange?

• Adipose
• Capillaries
• Brochioles
• Alveoli
• Lipids - ANSWER ✔d. Alveoli

Name any of the following that spirometry is meant to measure?

• Air volume inhalation
• Air volume exhalation
• Breathing Rate
• Dead Space Volume
• Alveoli Rate - ANSWER ✔a. Air volume inhalation
• Air volume exhalation
• Breathing Rate

Which of the following describes blood flow?

• Ventilation
• Respiration
• Hydration
• Perfusion
• Perspiration - ANSWER ✔d. Perfusion

Oxygen transport and removal of carbon dioxide is the function of which of the following?

• Leukocytes
• Thrombocytes
• Erythrocytes
• Erythofranklincytes
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