Tissues are groups of similar cells working together to:

A. Peritonitis: Peritonitis is inflammation of the peritoneal cavity, often due to infection, not necessarily linked to reduced protein synthesis.

B. Pneumonia: Pneumonia is a lung infection that may occur due to weakened immunity in aging individuals but is not directly caused by reduced protein synthesis.

C. Skin breakdown (pressure injury): Slowed tissue repair due to reduced protein synthesis increases the risk of skin breakdown and pressure injuries in elderly clients.

D. Meningitis: Meningitis is inflammation of the meninges due to infection, not due to slowed tissue repair.

A. For fluid balance: Lipids do not play a direct role in maintaining fluid balance; electrolytes and plasma proteins like albumin regulate this function.

B. As a component of the myelin sheath: Lipids, particularly phospholipids and cholesterol, are essential for forming the myelin sheath, which insulates nerve fibers and facilitates efficient nerve conduction.

C. Component of hemoglobin: Hemoglobin is composed of iron and protein (globin chains), not lipids.

D. As a component of the cell membrane: Cell membranes are composed of a lipid bilayer (phospholipids and cholesterol), which helps maintain structural integrity and fluidity.

E. As an energy source: Lipids provide a concentrated energy source, yielding 9 kcal per gram, which is more than carbohydrates (4 kcal/g).