The nurse is assessing the skin of their patient and observe pallor and cyanosis. The nurse knows that this may indicate which of the following?

A. Glycogen: The liver breaks down stored glycogen into glucose (glycogenolysis) to maintain blood sugar levels.

B. Metabolism: Metabolism refers to all chemical processes in the body but is not a specific substance that increases blood sugar.

C. Glucagon: Glucagon is a hormone released by the pancreas to stimulate glycogen breakdown and gluconeogenesis, increasing blood sugar levels.

D. Insulin: Insulin lowers blood sugar by promoting glucose uptake into cells, so it would not be used to increase blood sugar.

E. Glycolysis: Glycolysis is the breakdown of glucose for energy; it does not raise blood sugar levels.

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.