In humans,oxygen is delivered to the cells of the body by ________.
A)a closed circulatory system
B)an open circulatory system
C)diffusion
D)diffusion and facilitated diffusion

Question

Quizplus · Accepted Answer

Humans have a closed circulatory system in which oxygen is delivered to cells by the blood. In a closed circulatory system, blood is contained within vessels and is pumped by the heart, allowing for more efficient delivery of oxygen to cells compared to an open circulatory system or diffusion alone.

In Humans,oxygen Is Delivered to the Cells of the Body