Which of the following best describe scar tissue?

A. Types of muscle tissue: skeletal, cardiac, adipose: This group is incorrect because adipose (fat) is not a type of muscle tissue. The three correct types of muscle tissue are skeletal, cardiac, and smooth.

B. Types of tissue: epithelial, connective, nerve, muscle: The four main types of tissues in the human body are epithelial, connective, nervous, and muscle tissue.

C. Types of nervous cells: neurons, neuroglia. The nervous system consists of neurons (which transmit electrical signals) and neuroglia (which support and protect neurons).

D. Serous membranes: pleura, peritoneum, pericardium. The pleura (lungs), peritoneum (abdominal organs), and pericardium (heart) are all serous membranes.

A. Lipids: Some hormones (e.g., steroid hormones like estrogen and testosterone) are lipid-based, but not all. Hemoglobin is a protein, not a lipid.

B. Glucose: Glucose is a carbohydrate used for energy, not for building hormones or hemoglobin.

C. Proteins: Hormones (such as insulin and growth hormone) and hemoglobin (which carries oxygen in red blood cells) are protein-based molecules essential for bodily functions.

D. Carbohydrates: Carbohydrates provide energy but do not contribute to the structure of proteins like hormones and hemoglobin.