Final answer:
The correct answer is d) diffusion of oxygen from blood to tissues, which represents internal respiration, the exchange of gases at the tissue level.
Step-by-step explanation:
The component of internal respiration from the options provided is d) diffusion of oxygen from blood to tissues. Internal respiration involves the exchange of gases between the blood and body tissues. Oxygen diffuses from the blood, where its partial pressure is higher, into the tissues, where its partial pressure is lower, due to continuous use in cellular respiration.
Similarly, carbon dioxide produced as a waste product in tissues as a result of cellular respiration diffuses into the blood for transport back to the lungs. The other processes like ventilation, transport of oxygen in the blood, and oxidative phosphorylation are indeed related to respiration but are not considered components of internal respiration.