The nurse knows that protein synthesis slows down as people age, causing a slowing down of tissue growth and repair. Knowing this, which of the following conditions should the nurse look for in their aging clients?

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).

A. They give the body essential amino acids: Carbohydrates do not provide amino acids; proteins are the primary source of amino acids.

B. They give the body quick energy: Simple carbohydrates (monosaccharides) provide quick energy as they are rapidly absorbed and metabolized.

C. They give the body nonessential amino acids: Carbohydrates do not contribute to amino acid supply; nonessential amino acids can be synthesized by the body.

D. They give the body sustainable energy: Complex carbohydrates, such as whole grains and fiber, provide long-lasting energy as they take longer to break down into glucose.