The fluid outside the cells of the body has two main components:
[ Select ]
plasma
interstitial fluid
, 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 ]
plasma
interstitial fluid
 , 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 components of the fluid outside body cells and asks us to fill in the blanks with the correct terms.

First blank: options to choose from are 'plasma' and 'interstitial fluid'. The statement says the fluid portion of the blood is one component. The fluid portion of blood is plasma, which carries blood cells and dissolved substances within the circulatory system. Therefore, the correct fill for the first blank is plasma.

Second blank: the phrase refers to the fluid that surrounds the cells. The fluid that bathes and surrounds the cells in tissues is interstitial fluid (also called tissue fluid). It lies outside the cells but outside the blood vessels as well, filling the extracellular space between cells. Thus, the correct fill for the second blank is interstitial fluid.

To summarize concepts clearly: plasma is the liquid component of blood itself, not the fluid surrounding all body cells; interstitial fluid is the extracellular fluid found in tissues that surrounds cells, not the blood. Mixing them up would conflate the internal blood environment with the extracellular tissue environment.

If you were evaluating alternatives, choosing plasma for the first blank would be correct because it directly defines the liquid part of blood. Choosing interstitial fluid for the second blank would be correct because it describes the extracellular fluid that surrounds cells in tissues. The other pairing would be biologically inaccurate because it would place the tissue-interstitial context inside the blood or vice versa.

ANSC20001_2025_SM1 Week 1 - test yourself

The fluid outside the cells of the body has two main components: [ Select ] plasma interstitial fluid , 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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