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1 year ago

Oncotic force is a type of osmotic force due to having a differential concentration of ________ across the wall of a capillary

1 answer:

6 0

Oncotic force is a type of osmotic force due to having a differential concentration of the blood and tissue fluid across the wall of a capillary.

Osmotic pressure or the oncotic force is the pressure that drives reabsorption, that is, the movement of fluids to the capillaries, from the interstitial fluid. Therefore, osmotic pressure draws the fluid back into the capillaries as opposed to hydrostatic pressure which which forces the fluid out of it.

The flow happens from a region of higher concentration of the solute to the region of lower concentration of the solute (higher concentration of water), through a semi-permeable membrane.

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Suppose you find a rock that contains 10 micrograms of radioactive potassium-40, which has a half-life of 1.25 billion years. By

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Answer:

The rock is 3.75 billion years ago.

Explanation:

Given that:

Half life = 1.25 billion years

1 billion years = 10⁹ years

So,

Half life = 1.25 × 10⁹ years

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Where, k is rate constant

So,

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Final amount $[A_t]$ = 10 micrograms

Using integrated rate law for first order kinetics as:

$[A_t]=[A_0]e^{-kt}$

So,

$10=80\times e^{-5.5452\times 10^{-10}\times t}$

$80e^{-5.5452\times \:10^{-10}x}=10$

$\frac{80e^{-5.5452\times \:10^{-10}x}}{80}=\frac{10}{80}$

$\ln \left(e^{-5.5452\times \:10^{-10}x}\right)=\ln \left(\frac{1}{8}\right)$

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So,

The rock is 3.75 billion years ago.

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