Answer:
E) Improve membrane fluidity
Explanation:
Cholesterol constitutes the basic structural element of the skeleton of cell membranes. Without their reinforcement, the membranes would become extremely fluid and lose their consistency. Cholesterol is found in the esterified membranes in its hydroxyl group (OH): with fatty acids, mainly oleic and linoleic, or as cholesterol sulfate. The cholesterol-sulfate polar group is disposed on one of the faces of the membrane that interacts with other polar groups in that area, while its bulky hydrophobic portion is embedded between the apolar parts of the lipids that form the membrane skeleton and They fulfill many other functions, among which the reduction in the permeability of protons and sodium ions, and their participation in signal transmission. Cholesterol is also essential in phagocytosis processes carried out by cells to capture many nutrients and, in general, for the function of cleaning up organic waste produced by macrophages.
The membranes must have a fluid structure so that the integrated proteins can move "horizontally" to interact with their ligands and with other proteins. The fluidity is given by unsaturated fat. With the excess of saturated fat, the membranes become rigid, but only with the necessary unsaturated fat the membranes are extremely fluid and very sensitive to temperature changes. Cholesterol stabilizes the structure of the membranes; In order for them to have the correct structure, they must have the correct proportions of saturated, unsaturated fats and cholesterol. The membranes produced in the laboratory without cholesterol are unstable to temperature changes, drastically modifying their fluidity against the small temperature changes that occur in the physiological range.
In addition to its functions in cell membranes, cholesterol is an important product that metabolism uses as a raw material to make other compounds:
*Bile salts
*Sex hormones
*Hormones of the adrenal cortex (corticosteroids)
*Vitamin D (Calciferol)
Answer:
The form of circulatory shock known as hypovolemic shock is the condition when the plasma level of blood and the body fluids level is decreased rapidly causing insufficient level of oxygen in the blood . the form of shock caused by anaphylaxis any condition in which blood vessels are inadequately filled and blood cannot circulate normally shock that results from large-scale loss of blood volume, or after severe vomiting or diarrhea always fatal
Explanation:
- hypovolemic shock is one type of shock among different kinds of shock. it happens when body fluids or blood plasma level starts to decrease rapidly due to some internal or external injury such as bleeding, dehydration, burns, and severe vomiting, diarrhea.
- later causes body fluid loss which decreases the o₂ level in blood.
- this causes lack of o₂ supply in organs which is indeed a fatal condition.
The statement 'a crocodile-like animal is the ancestor of birds' is BEST supported by the information in the table (option A).
- Evolution refers to the biological process of descendence with modification.
- Evolutionary close species share functional and structural phenotypic features due to a same-origin during evolution.
- A crocodile is a reptile, and it has been shown that birds evolved from theropod dinosaurs (reptile).
In conclusion, the statement 'a crocodile-like animal is the ancestor of birds' is BEST supported by the information in the table (option A).
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brainly.com/question/599077
<u><em>Similarities:</em></u>
<u><em>They both transform nutrients.</em></u>
<u><em>They both send water to leaves.</em></u>
<u><em>They are hard Tubes</em></u>
<u><em>Difference:</em></u>
<u><em>The roots are sticked to the ground.</em></u>
<u><em>The stem holds leaves.</em></u>
<u><em>The stem is green while the roots are brown</em></u>
<u><em>The stem sucks air while the roots suck water.</em></u>
