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3 years ago

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Biology

1 answer:

Lelechka [254]3 years ago

6 0

Answer:

The cell membrane is selectively permeable, which controls the movement of materials in and out of the cell by passive and active transport.

Explanation:

According to this question, animal cells are made up of the following contents: 90% water and 10% protein, carbohydrates, nucleic acid, lipids and other molecules. The cell regulates this internal composition in a stable way via a process called HOMEOSTASIS.

The animal cell is able to regulate or maintain a stable internal composition by the possession of a selective permeable membrane called CELL MEMBRANE. The cell membrane is semi-permeable in the sense that it allows the entry of some molecules into and out of the cell and blocks others.

Some molecules are allowed by the cell membrane without the need for energy input in a transport called PASSIVE TRANSPORT while some requires energy input in a transport called ACTIVE TRANSPORT.

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barxatty [35]

Wavelength

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Answer:

Lead in $6.0 * 10^{3}\\$ g of blood $= 2.4 * 10^{-3}$ grams

Explanation:

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Amount of lead in human blood - $0.40$ parts per million (ppm)

This is equivalent to $0.40$ g of lead for each million grams of blood

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Lead in $6.0 * 10^{3}\\$ g of blood

$= \frac{0.40}{10^6} * 6.0 * 10^3\\= 2.4 * 10^{-3}$ grams

Lead in $6.0 * 10^{3}\\$ g of blood $= 2.4 * 10^{-3}$ grams

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Metanephridia differ from protonephridia in that selective reabsorption of materials occurs via cells lining the tubules in protonephridia and via capillaries in metanephridia is true.

<h3>What are the Metanephridia?</h3>

Metanephridia gather the liquid from the celomatic hollow space via a funnel-like shape known as nephrostome. The coelomic fluid enters the tubulus, water and vitamins are reabsorbed, and the metabolic waste inclusive of ammonia, urea, or uric acid is excreted.

The principal distinction among protonephridia and metanephridia is that protonephridia are a community of dead-give up tubules with out inner openings, while metanephridia are a kind of excretory glands with a ciliated funnel starting into the frame hollow space.

Read more about the protonephridia :

brainly.com/question/11072950

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