Question

a person is bitten by a venomous snake and receives an immediate injection of \antivenom,\ which contains antibodies. why is this a clear example of passive immunity? because the persons own immune system produced antibodies in response to the venom. because the protection from the antivenom will last for the persons entire lifetime. because snake venom is not a pathogen, so it cannot trigger an immune response. because the person is receiving pre - made antibodies from an outside source, not producing their own. what is the fundamental reason that active immunity typically provides long - lasting protection, while passive immunity is temporary? active immunity involves the formation of memory cells, which can produce antibodies for a future response, whereas passive immunity does not. the antibodies received during passive immunity are weaker than those produced during active immunity. passive immunity only works against viruses, while active immunity works against all pathogens. active immunity is only acquired from a doctor, which makes it stronger

Explanation:

1. Passive immunity involves receiving pre - formed antibodies from an external source. In the case of antivenom, the person is getting pre - made antibodies, not producing their own, which is characteristic of passive immunity.
2. Active immunity provides long - lasting protection because memory cells are formed. These memory cells can recognize and respond to the pathogen in the future by producing antibodies. Passive immunity does not involve the formation of memory cells, so it is temporary.

Answer:

1. D. Because the person is receiving pre - made antibodies from an outside source, not producing their own.
2. A. Active immunity involves the formation of memory cells, which can produce antibodies for a future response, whereas passive immunity does not.