Each hemoglobin molecule can carry, ______ oxygen molecules. A. 280 million B. 4 C. 1 billion D. 2
The Correct Answer and Explanation is:
The correct answer is B. 4.
Each hemoglobin molecule can carry up to four oxygen molecules. Hemoglobin is a protein found in red blood cells, and it is responsible for transporting oxygen from the lungs to tissues and organs throughout the body. The structure of hemoglobin allows it to bind with oxygen molecules efficiently.
Hemoglobin is made up of four subunits, each containing a heme group. A heme group consists of an iron atom that can bind to one oxygen molecule. When all four subunits are occupied, the hemoglobin molecule can carry a total of four oxygen molecules. This allows for efficient oxygen transport within the body, especially under the varying oxygen demands of tissues during physical activity or rest.
The process of oxygen binding and release is influenced by several factors, such as the partial pressure of oxygen (pO2), pH levels, and the presence of carbon dioxide (CO2). When oxygen concentration is high, such as in the lungs, hemoglobin readily binds to oxygen. Conversely, in tissues with low oxygen concentrations, hemoglobin releases the oxygen it carries to facilitate cellular respiration.
Therefore, the capacity of hemoglobin to bind four oxygen molecules at a time is crucial for maintaining proper oxygen levels in the body, enabling the cells to receive the oxygen they need for energy production and other vital functions.
