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saw5 [17]
3 years ago
15

Which object is used to focus light in a light microscope?

Biology
1 answer:
MA_775_DIABLO [31]3 years ago
8 0
Adjustment knobs are used to focus light in a light microscope
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Structures that have different functions in different species but develop from the same embryonic tissues are called ___________
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The circulation disperses oxygen rich blood throughout the body is called
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Major circulation or systemic circulation

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This invention made amputation much safer, which cut down on the number of people who died during the procedure
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The correct answer is:  a tourniquet.

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3 years ago
What happens after activation of T cells<br>​
NikAS [45]

Answer:

Helper T cells are arguably the most important cells in adaptive immunity, as they are required for almost all adaptive immune responses. They not only help activate B cells to secrete antibodies and macrophages to destroy ingested microbes, but they also help activate cytotoxic T cells to kill infected target cells.

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Helper T cells become activated when they are presented with peptide antigens by MHC class II molecules, which are expressed on the surface of antigen-presenting cells (APCs). Once activated, they divide rapidly and secrete cytokines that regulate or assist the immune response.

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