The muscle is a soft tissue found in most animals. The cells in the muscle contain protein that produces a contraction that changes both the length and shape of the cell. They are responsible for the movement it produces in the human body. There are three types of muscle cell: skeletal, cardiac and smooth muscle. Cardiac muscle contains excess amounts of mitochondria and myoglobin. The myoglobin is responsible for the red color of the muscle. The answer is letter B.