Answer:
Macrophages are part of your innate immune system, which is antigen-independent and does not require activation.
Explanation:
Macrophages phagocytize (internalize) all non-self pathogens it encounters. These do their job without activation. Other cells in the innate immune system include basophils, neutrophils, eosinophils (these cells are polymorphonuclear leukocytes), mast cells, and dendritic cells, which act as the bridge between your innate and adaptive immune system.
All of the other entities listed above are part of your adaptive immune system. The adaptive immune system is antigen-dependent and requires activation. This section of your immune system responds differently to different pathogens, and has the bonus of having immunologic memory, the ability to remember pathogens after infection and respond much quicker upon secondary and tertiary encounters.
Note: All lymphocyte types begin as naïve cells, which then differentiate into their fully matured form upon activation.
Helper T cells are a type of CD4+ T cell that has the job of activating B and T lymphocytes. There are two different types of T helper cells: Th1 and Th2. Th1 cells secrete the cytokine interferon-gamma (IFNγ), and is primarily involved with the stimulation and activation of cytotoxic T cells, while Th2 cells secrete a variety of cytokines and are responsible for activating and assisting with B cells to make antibodies. To make a long story short, Th cells interact with APC (Antigen Presenting Cells), specifically their Class II MHC (a group of genes that present exogenous proteins). The Th cells then proliferate and gain the ability to activate these APC cells and provide the necessary signals to activate B and T cells and make them proliferate and do their specific function.
Answer:
4 Charles Darwin was not able to explain the variation
Oh ok look at comments make me brainliest first
Answer:
it's true ...............
When attempting to locate and identify a stage of mitosis using the compound light microscope, your microscope should at least be on 400x total magnification to properly identify the stage.
<h3>What is cell division ?</h3>
The process through which a mother cell divides into two or more daughter cells is known as cell division. Typically, cell division takes place as a part of a wider cell cycle.
Cell division comes in three flavours. In order to create more cells, cells must divide. Mitosis, meiosis, and binary fission are the three processes that they use to finish this division.
<h3>Types of cell division :</h3>
In order to prepare for cell division, a cell must replicate its chromosomes and then segregate them to create two identical nuclei. This process is known as mitosis.
In sexually reproducing organisms, a type of cell division known as meiosis results in a decrease in the number of chromosomes in gametes (the sex cells, or egg and sperm).
The division of the body into two new bodies during asexual reproduction is called binary fission.
To know more about microscope visit :
brainly.com/question/18661784
#SPJ4