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Lady bird [3.3K]
2 years ago
8

En los alérgicos, a partir del segundo contacto con el alérgeno cuando se produce la reacción alérgica. ¿Cómo podrías explicarlo

?
Biology
1 answer:
dem82 [27]2 years ago
4 0

Answer:

La segunda exposición desencadena la fase de 'respuesta' asociada a la reacción alérgica  

Explanation:

La alergia se puede considerar como una respuesta desmedida del sistema inmune cuando un individuo entra en contacto con ciertas sustancias que son inocuas para la mayoría de la población, pero que en personas alérgicas desencadenan fuertes reacciones de hipersensibilidad. La alergia tiene dos fases conocidas como fase de sensibilización y fase de respuesta. La primera fase de sensibilización es donde el individuo entra en contacto con los 'antígenos' del alérgeno, lo cual provoca que el individuo genere anticuerpos IgE los cuales combaten al alérgeno (el sistema inmune considera que esta sustancia es potencialmente dañina), mediante la generación de anticuerpos de IgE que se unen a receptores de células del sistema inmune (eosinófilos, basófilos y mastocitos). La segunda fase de respuesta se produce cuando el individuo entra de nuevo en contacto con el alérgeno. Durante el segundo contacto, los antígenos del alérgeno interactúan con anticuerpos específicos de IgE que se encuentran sobre la superficie de células del sistema inmune, desencadenando la degranulación de estas células (mastocitos) y la consecuente liberación de mediadores químicos de la alergia tales como, por ejemplo, histamina, los cuales son responsable de los síntomas típicos de la alergia (tos, estornudos, picor, enrojecimiento de ojos, urticaria, inflamación, etc.).

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After 1973, American scientists began to make serious efforts to develop technologies that
Ann [662]

Yes

Explanation:

Yes, because the embargo of 1973 showed how dependent we are on just one type of fuel, so it was necessary to start looking at different ways to create energy.

4 0
2 years ago
Which list shows three components of an organ system in order of least complex to most complex?
kolbaska11 [484]

Answer:

I believe its muscle cell, muscle tissue, stomach

Explanation:

The order for organ systems from least complex to most complex is: Cell, tissue, organ, organ system. Hope this helps

7 0
3 years ago
Read 2 more answers
List the 4 components of health related fitness and the appropriate guidelines for each
gregori [183]
These components include; 
Cardiorespiratory Endurance: Ability of the circulatory and respiratory systems to supply oxygen during sustained physical activity. 
Guidelines
3 - 5 days per week
20-60 minutes a day
intensity of 60%-90% of MHR

Muscular strength; the ability to perform activities that require high levels of muscular force.
2 -3 days per week
2-6 sets
≤ 6 repetitions 
Intensity of 80 - 90 % of 1RM

Muscular endurance; 
2 - 3 days per week 
2 - 3 sets
≥ 12 repetitions
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Flexibility 
2- 3 days a week
≥ 4 repetitions per muscle group 
15 - 60 seconds

Body composition     Women   men
Essential fat               10-13%   2-5 %
Athletes                     14-20%  6-13 %
Fitness                      21-24%  14-17 %
Average                    25-31%    18-24%
Obese                      ≥ 32%       ≥ 25%



5 0
3 years ago
Found: A Plant-Eating Spider. Spiders are meat-eaters. Until recently, scientists thought that was true for the roughly 40,000 s
lions [1.4K]

Answer:

Yes, competition is likely to occur

Explanation:

Competition is an ecological interaction between organisms of the same or different species, resulting in the detriment of one of the organisms. Competition is generally caused when organisms in an ecosystem occupies the same niche i.e. they rely on the same ecological resource, which could be food, mate, space etc.

The case described in this question involving a Bagheera kiplingi (jumping spider) and acacia ants will likely result in competition because they both occupy the same habitat and feed on the same food (vegetable plant). The two organisms will have to compete for this limited resource, hence, it is regarded as an INTERSPECIFIC COMPETITION because it involves two different organisms.

7 0
3 years ago
According to carl rogers, genuineness, acceptance, and empathy are to _____ in humans, as water, sun, and nutrients are to the g
Jobisdone [24]
The correct answer is that "<span>positive growth in humans".

We humans are compared to trees according to Carl Rogers. Like trees, we also are in need of things for us to have a positive growth, as trees need water, sunlight and nutrients to grow, we humans need empathy, genuineness and acceptance are needed for us to grow as a positive individual.</span>
4 0
3 years ago
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