According to Fick\'s law, which ONE of the following would NOT be a factor in di

Question

According to Fick's law, which ONE of the following would NOT be a factor in diffusion of a substance across the capillary wall? Select one: Hydrostatic (blood) pressure in the capillary The plasma concentration of the substance The molecular weight of the substance The concentration of the substance in the interstitial fluid The total surface area of the capillary wall Which ONE of the following organs/tissues receives the greatest increase in systemic blood flow during exercise? Select one: Skin Heart Kidneys Brain Muscle Which ONE of the following is true of the ventricular filling phase of the cardiac cycle? Select one: All valves in the heart are open. Ventricular pressure is greater than atrial pressure. Ventricular filling occurs during systole. Ventricular pressure is less than a pressure. Ventricular pressure is increasing.

Explanation / Answer

According to the Fick’s law the rate of diffusion of a substance depends on the following factors:

Directly proportional to:

•         the partial pressures of the gas above the liquid

•         surface area of available for gas exchange

•         solubility co-efficient of the gas

Inversely proportional to:

•         Gram molecular weight of the molecules

•         Thickness of the membrane

During systemic and regional blood flows during exercise is higher in flexor and extensor muscles of the limbs (X5 to X15 times), muscles of the back (X4) times.

Rapid Passive Ventricular Filling (Sixth Phase)

When left ventricle start relaxing, pressure in left ventricle start dropping rapidly until it reaches the point where pressure in the ventricle becomes less than the pressure in atrium, leads to opening of mitral valve. Blood which was previously accumulated in atrium will rush into ventricle. This rapid filling is done without atrial contraction.

Slow Passive Ventricular Filling (Seventh Phase)

As atrioventricular valve open, blood coming to atrium directly rushes into the ventricle. Here atrium is not acting as reservoir.

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