C) voltage gated sodium channels
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It starts with the cells<span>, followed by the tissues, then the organs, and ending with the organ .</span>
Answer:
An invasive species
Explanation:
Invasive species come from other environments, many times on accident, but usually thrive so much that they end up taking over and starving other native creatures by taking the resources. Hope this helps! (Brainliest appreciated :))
Answer:
b). activation of T cells
Explanation:
An APC (antigen-presenting cell) can be described as an immune cell, which detects, uptakes, and informs the acquired immune response when an infection takes place. B cells, macrophages, and dendritic cells are antigen-presenting cells.
These cells play an important role in activation of T cells. T cells are unable to recognize soluble or free antigens and can only recognize antigens processed and presented by carrier molecules, such as MHC molecules.
Presence of MHCII molecules is a defining feature of APCs that process and present antigens to T cells. Hence, all antigen-presenting cells help in activation of T cells.
Thus, the correct answer is option (b).
