Specialized Eukaryotic Cells and Tissues
A particular muscle is under involuntary control, but appears striated. It is most likely to be:
|A||The myocardium, the muscular portion of the heart.|
|B||The muscle(s) that surrounds the esophagus and causes peristalsis.|
|C||The biceps, the muscle that moves the forearm.|
|D||The diaphragm, the muscle that allows breathing to occur.|
The only muscle in the body that is involuntary and striated is cardiac muscle, and its only location is in the heart. Smooth muscle is involuntary and unstriated, as is described by choice B. Skeletal muscle is under voluntary control and appears striated, as is described by choice C. The diaphragm is under both involuntary and voluntary control, and is considered a skeletal muscle.