Final answer:
A) myoglobin. The iron-carrying protein responsible for transporting oxygen into muscle cells is myoglobin, which stores oxygen for muscle use.
Step-by-step explanation:
The iron-carrying protein that assists in the transport of oxygen into muscle cells is myoglobin. Myoglobin is a heme protein, similar to hemoglobin, that is found in muscle tissues. It binds to oxygen molecules and temporarily stores them, releasing oxygen as needed to maintain the muscle's activity level. Unlike myoglobin, hemoglobin is the protein inside red blood cells that carries oxygen to the body's tissues, including muscles, and carbon dioxide back to the lungs. Hemoglobin is made up of four protein subunits and contains iron in its heme groups that binds oxygen and gives blood its red color.
The iron-carrying protein that assists in the transport of oxygen into muscle cells is myoglobin.Hemoglobin is the protein inside red blood cells that carries oxygen to cells and carbon dioxide to the lungs. Hemoglobin is made up of four symmetrical subunits and contains iron which binds oxygen. Myoglobin, on the other hand, is found in muscle cells and stores oxygen for use during exercise.