Exam 3: BIOS 255 BIOS255 Latest

Exam 3: BIOS 255 / BIOS255 (Latest

Update 2025 / 2026) Anatomy and Physiology III with Lab | Questions with Answers | Grade A | 100% Correct - Chamberlain

Question:

respiratory membrane

Answer:

thin barrier between the alveolar air and blood

Question:

• layers of the respiratory membrane

Answer:

squamous alveolar cells, capillary endothelial cells, basement membrane

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Question:

pleurae

Answer:

double-layered membrane that lines the thoracic wall and surface of the lung

Question:

function of pleurae

Answer:

reduced friction during breathing & creates a pressure gradient that expands the lungs during inhalation

Question:

visceral pleura

Answer:

inner layer that covers the lung surface

Question:

parietal pleura

Answer:

outer layer that lines the inner surface of the thoracic wall 2 / 4

Question:

pleural cavity

Answer:

potential space between the 2 layers that contains a film of slippery pleural fluid

Question:

how much airflow does the diaphragm account for?

Answer:

two-thirds

Question:

what keeps the diaphragm alive?

Answer:

phrenic nerves (C3-C5)

Question:

how much airflow do the intercostal muscles account for?

Answer:

one-third 3 / 4

Question:

internal intercostal muscles

Answer:

muscles contract and pull the ribcage inward during forced exhalation

Question:

external intercostal muscles

Answer:

pulls the ribs upward during inhalation

Question:

atmospheric (barometric) pressure

Answer:

pressure applied upon us from the surrounding air; sea level average = 760mmHg

Question:

intrapulmonary pressure

Answer:

pressure w/in alveoli of the lungs; this pressure changes as air is inhaled or exhaled

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