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ycow [4]
2 years ago
8

How are humans immune to infectious diseases after they have already contracted the disease previously? and How do vaccinations

work to provide immunity?
Biology
1 answer:
Varvara68 [4.7K]2 years ago
6 0

Answer:

Explanation:

Immunity to a disease is achieved through the presence of antibodies to that disease in a person's system. Antibodies are proteins produced by the body to neutralize or destroy toxins or disease-carrying organisms. Antibodies are disease-specific. Viruses make us sick by killing cells or disrupting cell function. Our bodies often respond with fever (heat inactivates many viruses), the secretion of a chemical called interferon (which blocks viruses from reproducing), or by marshaling the immune system's antibodies and other cells to target the invader. A vaccine works by training the immune system to recognize and combat pathogens, either viruses or bacteria. To do this, certain molecules from the pathogen must be introduced into the body to trigger an immune response. These molecules are called antigens, and they are present on all viruses and bacteria.  

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OleMash [197]
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8 0
3 years ago
Preoperational thinker Blake has edged his way close to the top rim of the Grand Canyon. His mother then asks him, "What do you
Paraphin [41]

Answer:

Option B

Explanation:

Options

a. the sky..

b. the same thing I see..

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Solution -

Because of egocentrism, a child is unable to analyze and view a situation from the perspective of  other person. This is the second stage of Piaget's theory of cognitive development known as preoperational stage which generally starts at the age of 2 and last till the child is of age 7.  

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3 0
3 years ago
Diffrence between vertebrates and invertebrates​
andrew11 [14]
<h3>Answer:</h3>

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6 0
3 years ago
What structures to eukaryote cells have that prokaryotes do not?
Sergio [31]

Answer:

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