Questions and Answers
What is the average diameter of non-gated channels in the cell membrane?
5 Å
Which of the following is an example of passive transport?
Facilitated diffusion
Which electrolyte has the highest concentration in the plasma?
Sodium
What type of substances can pass easily through the lipid bilayer of the cell membrane?
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Which of the following processes requires energy input?
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What is the percentage of body weight occupied by intravascular fluid?
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Which fluid compartment is described as 'the internal environment' of the body?
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What is the percentage of body weight occupied by intracellular fluid?
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What is the percentage of body weight occupied by extracellular fluid?
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What is the total body water as a percentage of body weight?
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Study Notes
Cell Membrane and Transport
- The average diameter of non-gated channels in the cell membrane is not specified.
- Passive transport is exemplified by simple diffusion, osmosis, and facilitated diffusion.
Body Fluids
- The electrolyte with the highest concentration in the plasma is not specified.
- The lipid bilayer of the cell membrane allows for easy passage of non-polar and hydrophobic substances.
- Active transport requires energy input.
Body Fluid Compartments
- Intravascular fluid occupies around 5% of body weight.
- The internal environment of the body is described as the intracellular fluid.
- Intracellular fluid occupies around 40% of body weight.
- Extracellular fluid occupies around 20% of body weight.
- Total body water occupies around 60% of body weight.
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