What is one type of white blood cell that participates in the specific immune response called? a. antigens b. antibodies c. macrophages d. pathogens

The right answer is C. macrophages.

A macrophage is one type of cells of the immune system. It is part of the white blood cells.

Macrophages have three main functions:

* phagocytosis (ingestion of bacteria, yeasts, cellular debris ...). The intracellular vesicle formed is called the phagosome, which will be directed to the lysosome for its complete degradation;

* secretion activity (cytokines ...);

* cellular cooperation (it is an antigen presenting cell, relationship with the lymphocytes).

They are therefore actors of innate immune response, since they phagocytose nonspecific elements. They are attracted to the place of inflammation by chemotaxis.

the circled areas are referred to   as sunspots.   the sunspots are cooler than the   surrounding area.

sunspots are temporary phenomena on the photosphere of the sun that appear visibly as dark spots compared to surrounding regions. they correspond to concentrations of magnetic field flux that inhibit convection and result in reduced surface temperature compared to the surrounding photosphere.