Which fluid contains plasma as its component?

Which fluid contains plasma as its component?

• A. Plasma
• B. Interstitial fluid
• C. Lymph
• D. CSF

Answer: (A)

The main idea is that plasma is the liquid part of blood that carries cells, nutrients, hormones, and wastes. When asked which fluid contains plasma as its component, the only fluid that literally includes plasma is plasma itself—the others are different body fluids that come from plasma or are separated from it and do not include plasma as a constituent in the same way. Interstitial fluid surrounds cells and comes from plasma as it filters out of capillaries, but most plasma proteins stay in the blood, so it’s not plasma. Lymph is formed from interstitial fluid and has fewer proteins; cerebrospinal fluid is produced in the brain and has a distinct composition with very little plasma. So plasma is the correct choice because it is the fluid that contains plasma as its component.

The main idea is that plasma is the liquid part of blood that carries cells, nutrients, hormones, and wastes. When asked which fluid contains plasma as its component, the only fluid that literally includes plasma is plasma itself—the others are different body fluids that come from plasma or are separated from it and do not include plasma as a constituent in the same way. Interstitial fluid surrounds cells and comes from plasma as it filters out of capillaries, but most plasma proteins stay in the blood, so it’s not plasma. Lymph is formed from interstitial fluid and has fewer proteins; cerebrospinal fluid is produced in the brain and has a distinct composition with very little plasma. So plasma is the correct choice because it is the fluid that contains plasma as its component.