10 Questions
What percentage of body weight does the intracellular fluid (ICF) account for?
40%
What percentage of total body weight does the extracellular fluid (ECF) account for?
20%
What is the percentage of body weight accounted for by interstitial fluid?
15%
Which fluid compartment is present inside the blood vessels and lymph vessels?
Extracellular fluid
In which fluid compartment is the concentration of potassium the highest?
Intracellular fluid
Which type of passive transport involves the movement of water to equalize gradient?
Osmosis
Which fluid compartment is referred to as 'the internal environment' of the body?
Intracellular fluid
What is the main difference between diffusion through the lipid bilayer and diffusion through protein channels?
Protein channels allow passage of fat-soluble substances, while lipid bilayer does not
What type of channels are voltage-gated and ligand-gated channels?
Channels that are closed during rest
What does net diffusion require in order to occur?
A concentration difference between two regions of a solution
Study Notes
Fluid Compartments
- Intracellular fluid (ICF) accounts for approximately 40% of body weight.
- Extracellular fluid (ECF) accounts for approximately 20% of body weight.
- Interstitial fluid accounts for approximately 10-15% of body weight.
Fluid Compartment Locations
- Plasma and lymph are present inside blood vessels and lymph vessels.
Ionic Balance
- The concentration of potassium is highest in intracellular fluid.
Passive Transport
- Osmosis is the type of passive transport that involves the movement of water to equalize gradient.
Internal Environment
- The extracellular fluid is referred to as "the internal environment" of the body.
Diffusion
- The main difference between diffusion through the lipid bilayer and diffusion through protein channels is the mechanism of transport: lipid bilayer diffusion is passive, whereas protein channel diffusion is facilitated.
- Voltage-gated and ligand-gated channels are types of protein channels.
Net Diffusion
- Net diffusion requires a concentration gradient to occur.
Test your knowledge on body fluid composition and transport mechanisms including the amount and compartments of body water, mechanisms of transport across the cell membrane, and resting membrane potential. Understand the body composition percentages of protein, fat, mineral, and water, as well as the fluid compartments within the body.
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