alleryStart learning →In which direction does a gas move between two connected regions?
AFrom lower to higher partial pressure
BFrom higher to lower total pressure only
CFrom higher to lower partial pressure
DEqually in both directions at all times
Answer & Solution
Correct answer: C. From higher to lower partial pressure
1. Gases connected across two regions tend to equalise their pressure.
2. Each gas moves according to its own partial pressure, not the total pressure of the mixture.
3. It moves from where its partial pressure is higher to where it is lower.
4. So the third option is correct, and the second option wrongly makes total pressure the deciding term.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 22 "The Respiratory System", section 22.4 Gas Exchange_
Keep practising The Respiratory System
Browse all The Respiratory System questions for NEET PG, or explore more Physiology topics.
Related questions
Why is survival low for a baby born before 26 weeks?By how much has surfactant therapy reduced death from respiratory distress syndrome?What proportions of preterm infants are quoted as developing respiratory distress syndromeWhat happens to the fluid left in the lungs after delivery?How soon after birth does the first inhalation occur?What does the fetus move in and out during fetal breathing movements?Around which week do fetal breathing movements begin?When does a full complement of functional alveoli appear?