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erik [133]
3 years ago
14

What is histamine and what is its role in allergic reactions

Biology
1 answer:
never [62]3 years ago
3 0
As part of an immune response to foreign pathogens, histamine is produced by basophils and by mast cells found in nearby connective tissues. Histamine increases the permeability of the capillaries to white blood cells and some proteins, to allow them to engage pathogens in the infected tissues
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Where is DNA replication located
Step2247 [10]
In the nucleus. Hope this helps
6 0
2 years ago
Which of the diagrams shows red blood cells in 0.0 M Solution​
Julli [10]

The rigth answer is the picture 4.

In the case of a hypotonic extracellular medium, there will be a large inflow of water to dilute the Na, thereby increasing the cell volume and there will be an explosion of the membrane in places so hemolysis, the contents of the red cell ( Hemoglobin) is released into the blood plasma.

On the other hand, in the case where the extracellular medium is hypertonic, therefore archi concentrated, well it will be the water of the red cell that will come out without damaging the membrane, we will rather have a red cell that is completely flat and non-functional without release. erythrocyte (Hb) content.

3 0
2 years ago
Endosymbiont theory explains some of the differences and similarities between prokaryotes and eukaryotes. Categorize the followi
spayn [35]

Answer:

Endosymbiont theory was proposed by Lynn Margulis in 1967 which suggested the origin of Chloroplast and mitochondria in eukaryotic cells.

The theory suggested that chloroplast and mitochondria organelle originated by engulfing the cyanobacteria and proteobacteria by other prokaryotic bacteria.

This shows that Prokaryotes exhibit the following characters:

1. These were the first organisms on Earth

2. Lack membrane-bounded

3. Aerobic bacteria are these types of cells

Eukaryotes exhibit:

1. Have mitochondria

2. Includes organisms that carry out aerobic respiration

3. Can be a multicellular organism

4. Includes organisms that are photosynthetic

5. Might have chloroplasts

6 0
3 years ago
What is it called when a substance provides a form of energy during a chemical change
Nuetrik [128]
It's called chemical reaction.

(I'm not real sure)
4 0
2 years ago
How many nitrogen atoms are there in 5 molecules of N2H4<br><br>Hint: The symbol for nitrogen is N​
ElenaW [278]

10

In one molecule of N2H4 (Hydrazine), there are two nitrogen atoms.

So, to find how many there are in five molecules, multiply by five.

2 x 5 = 10

7 0
2 years ago
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