The fluid outside the cells of the body has two main components:
[ Select ]
interstitial fluid
plasma
, which is the fluid portion of the blood, and
[ Select ]
interstitial fluid
plasma
, which is the fluid that surrounds the cells.

Question

The fluid outside the cells of the body has two main components: 
[ Select ]
interstitial fluid
plasma
 , which is the fluid portion of the blood, and  
[ Select ]
interstitial fluid
plasma
  , which is the fluid that surrounds the cells.

BlackTom AI · Accepted Answer

The question describes the two main fluid components of the extracellular environment and asks you to select the correct terms for two blank positions.

First blank: choosing between plasma and interstitial fluid. If we recall physiology, plasma is the fluid portion of blood, carrying cells, proteins, nutrients, and wastes. Interstitial fluid, on the other hand, is the fluid that bathes the cells in tissues but is not the blood component. Therefore, the correct term to fill the first blank is plasma, because the statement is contrasting the blood fluid with the fluid surrounding cells, both of which are distinct from each other.

Second blank: choosing between plasma and interstitial fluid. Here the target is the fluid that surrounds the cells in tissues. That surrounding fluid is interstitial fluid, which lies outside the cells but within the extracellular space, and is not the same as plasma. If one had placed plasma in this position, it would incorrectly identify the fluid outside cells as the blood plasma rather than as the tissue fluid.

Common misconceptions to watch for:
- Confusing plasma with interstitial fluid in the first blank would imply the two terms describe the same fluid, which they do not; plasma is within blood vessels, whereas interstitial fluid surrounds cells.
- Filling the second blank with plasma would mislabel the extracellular environment around cells as blood fluid rather than tissue fluid, which would conflict with anatomical distinctions between vascular and interstitial compartments.

Taken together, the intended pairing is: first blank = plasma, second blank = interstitial fluid, matching the anatomical separation between blood plasma and the fluid surrounding cells.

ANSC20001_2025_SM1 Week 1 - test yourself

The fluid outside the cells of the body has two main components: [ Select ] interstitial fluid plasma , which is the fluid portion of the blood, and [ Select ] interstitial fluid plasma , which is the fluid that surrounds the cells.

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