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Multiple Choice
In which fluid compartment would you primarily find red blood cells?
A
Intracellular fluid
B
Blood (formed elements)
C
Plasma
D
Interstitial fluid
Verified step by step guidance
1
Step 1: Understand the concept of fluid compartments in the body. The human body is divided into major fluid compartments: intracellular fluid (inside cells), extracellular fluid (outside cells), which includes plasma (the liquid portion of blood) and interstitial fluid (fluid between cells).
Step 2: Recognize the location of red blood cells (RBCs). Red blood cells are specialized cells that function primarily within the circulatory system. They are suspended in plasma but are considered part of the formed elements of blood.
Step 3: Differentiate between plasma and formed elements. Plasma is the liquid portion of blood, while formed elements include red blood cells, white blood cells, and platelets. Red blood cells are not part of the plasma but are part of the formed elements.
Step 4: Clarify why red blood cells are categorized under 'blood (formed elements)' rather than intracellular fluid or interstitial fluid. Red blood cells are contained within the blood vessels and are not free-floating in interstitial fluid or part of intracellular fluid (which refers to the fluid inside the cells of tissues).
Step 5: Conclude that the primary fluid compartment for red blood cells is 'blood (formed elements)' because they are cellular components of blood and function within the circulatory system.