Which of the following are involved in external respiration?
A) Red blood cells and body cells
B) Scalenes and trapezius muscles
C) Alveoli and pulmonary capillaries
D) External oblique and transverse abdominal muscles

Question

Quizplus · Accepted Answer

External respiration involves the exchange of oxygen and carbon dioxide (CO₂)between the alveoli and the pulmonary capillaries.Internal respiration occurs at the cellular level and involves movement of oxygen from the systemic blood into the cells.Scalene and trapezius muscles are accessory muscles of inspiration.External oblique and transverse abdominal muscles are accessory muscles of expiration.

Which of the Following Are Involved in External Respiration