Which of the following is not a type of muscle? A, Hyaline B. Cardiac C. Skeletal D. Smooth
The correct answer and explanation is:
Correct Answer: A. Hyaline
Hyaline is not a type of muscle. It is a type of cartilage, which is a connective tissue. The three types of muscle in the human body are cardiac, skeletal, and smooth muscle. These muscle types have different structures, functions, and locations in the body.
Skeletal muscle is a voluntary muscle, meaning it is controlled consciously. It is attached to bones and is responsible for body movements such as walking, lifting, and writing. These muscles appear striated under a microscope due to the regular arrangement of muscle fibers.
Cardiac muscle is found only in the heart. It is involuntary, meaning it functions without conscious control. Like skeletal muscle, it is striated, but the fibers are branched and connected by intercalated discs. These structures help coordinate the rhythmic contractions of the heart, allowing it to pump blood efficiently.
Smooth muscle is also involuntary and is found in the walls of internal organs such as the intestines, blood vessels, bladder, and uterus. Unlike skeletal and cardiac muscles, smooth muscle is non-striated and contracts more slowly. It helps move substances through the body, such as pushing food through the digestive tract or regulating blood pressure.
Hyaline cartilage, in contrast, is a flexible yet firm type of connective tissue. It is found in areas such as the nose, trachea, larynx, and at the ends of long bones. Its function is to provide smooth surfaces for joint movement, flexibility, and support. Since hyaline cartilage is not a muscle and does not contract, it is not classified as one of the muscle types. Therefore, the correct answer is Hyaline.