Anatomy & Physiology Part 2: The Respiratory & Circulatory Systems

An advanced quiz on gas exchange and blood transport.

📖 Core Concepts Review

ComponentPrimary FunctionKey Concepts
🌬️ Respiratory SystemGas exchange (O₂ in, CO₂ out)Alveoli, Partial Pressure Gradients, Diaphragm, Medulla Oblongata
🩸 BloodTransport mediumHaemoglobin, Red Blood Cells, Bicarbonate Buffer System
❤️ HeartPumps bloodFour Chambers (Atria, Ventricles), Valves
🔄 CirculationMoves blood through two circuitsPulmonary Circuit (to lungs), Systemic Circuit (to body)

Problem 1: Gas Exchange Gradient

Medium
Gas ExchangePartial PressureRespiratory

In the alveoli of the lungs, the partial pressure of oxygen (PO₂) is approximately 104 mmHg, while in the blood arriving at the lungs via the pulmonary artery, it is approximately 40 mmHg. What is the corresponding situation for carbon dioxide (PCO₂)?

A

PCO₂ in the alveoli is 45 mmHg; PCO₂ in the pulmonary artery blood is 40 mmHg.

B

PCO₂ in the alveoli is 40 mmHg; PCO₂ in the pulmonary artery blood is 45 mmHg.

C

PCO₂ in the alveoli is 40 mmHg; PCO₂ in the pulmonary artery blood is also 40 mmHg.

D

PCO₂ in the alveoli is 45 mmHg; PCO₂ in the pulmonary artery blood is 100 mmHg.