Final answer:
Oxygen, not carbon monoxide, Krebs cells, or lymphocytes, is required alongside glucose for cellular respiration, a critical process in energy production for metabolic activities. Cellular respiration consists of several phases and generates ATP, with oxygen playing a pivotal role as the final electron acceptor. The correct option is 4.
Step-by-step explanation:
In addition to glucose, oxygen is required to maintain the metabolic processes of life and energy production. Oxygen plays a critical role in the process of cellular respiration, which is how cells break down glucose and other nutrients to produce ATP, the energy currency of the cell.
When glucose is metabolized in the presence of oxygen, it ultimately produces carbon dioxide and water as byproducts, along with ATP. Cellular respiration involves multiple phases, including glycolysis, oxidation of pyruvate, the citric acid cycle (also known as the Krebs cycle), and oxidative phosphorylation.
As part of metabolism, carbohydrates are broken down into glucose, which then enters the cellular respiration pathway to generate ATP. The oxygen needed for this process is taken in by the respiratory system and transported to the cells via the cardiovascular system, while CO₂ produced is expelled by the opposite route.
Without oxygen, the body cannot efficiently produce ATP, and instead must rely on less efficient pathways such as fermentation, resulting in far less ATP production. The correct option is 4.