Biophysics of Body Fluids: Capillary Exchange Quiz

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Which process involves the movement of substances between blood and interstitial fluid?

Diffusing through the intercellular clefts

Membrane vesicular fusion

Diffusing through the endothelial cells fenestrations

Direct diffusion (correct)

What is the mission of the entire cardiovascular system?

To facilitate capillary transport (correct)

To keep blood flowing through arteries

To regulate blood pressure

To allow diffusion in the lungs

According to Fick’s first law, where does diffusion flux occur?

In the presence of membrane vesicular fusion

Independent of concentration gradient

From a region of high concentration to a region of low concentration (correct)

From a region of low concentration to a region of high concentration

What percentage of the blood in systemic capillaries is involved in continuous exchange with interstitial fluid?

7% Signup and view all the answers

Which method allows substances in blood or interstitial fluid to cross the walls of a capillary using pinocytosis and exocytosis?

Membrane vesicular fusion Signup and view all the answers

What is the formula for diffusion flux (J)?

Diffusion Flux (J) = Diffusion Coefficient x Surface Area x Concentration Gradient Signup and view all the answers

What property determines the diffusion coefficient (D) of a molecule?

Molecular weight Signup and view all the answers

Which process accounts for fluid transport across biological membranes?

Osmosis Signup and view all the answers

What is the osmotic pressure?

The pressure applied to prevent the inward flow of pure solvent across a semipermeable membrane Signup and view all the answers

How does the addition of solute to pure solvent affect the activity of water in the solution?

Reduces the activity of water Signup and view all the answers

What is the primary mission of the cardiovascular system in relation to capillary exchange?

Ensuring continuous flow of blood through capillaries for exchange with interstitial fluid Signup and view all the answers

Which method allows substances in blood or interstitial fluid to cross the walls of a capillary by diffusing through the endothelial cells fenestrations?

Diffusing through the endothelial cells fenestrations Signup and view all the answers

What does Fick's First Law state about the movement of particles (diffusion flux)?

It is directly proportional to the magnitude of the concentration gradient of the particles Signup and view all the answers

What is the role of membrane vesicular fusion in capillary exchange?

Facilitating the exchange of substances between blood and interstitial fluid using pinocytosis and exocytosis Signup and view all the answers

What is the significance of Fick's Law of Diffusion in capillary exchange?

It provides a framework for understanding the movement of particles between blood and interstitial fluid Signup and view all the answers

What is the formula for diffusion flux (J) in terms of diffusion coefficient (D), surface area (A), and concentration gradient (dc/dx)?

$J = D \cdot A \cdot \frac{dc}{dx}$ Signup and view all the answers

What is the diffusion coefficient (D) of a substance if its diffusion flux (J) is 500 g/s, the concentration gradient (dc/dx) is 20 g/m4, and the surface area (A) is 0.5 m2?

25 m2/s Signup and view all the answers

In osmosis, what causes the movement of solvent molecules across a semipermeable membrane?

Chemical potential difference Signup and view all the answers

What is the minimum pressure needed to be applied to a solution to prevent the inward flow of its pure solvent across a semipermeable membrane?

Osmotic pressure Signup and view all the answers

Which process accounts for fluid transport out of the kidney tubules and the gastrointestinal tract, into capillaries, and across cell membranes?