Answer:
a. surrounds individual muscles.
Explanation:
Individual muscle fibers have layers of connective tissue surrounding them. Epimysium, perimysium, and endomysium are the three layers of connective tissue that extend from the fascia and protect the muscle fibers. Epimysium is the outer most layer of connective tissue of individual muscle fiber. It encircles the entire muscle. Epimysium consists of dense irregular connective tissue. It serves to separate the muscle fibers from the other types of tissues present in the area to facilitate their independent movement.
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.
Explanation:
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.
It increases its metabolic activities to produce energy for the growth process. The water causes the turgor pressure to increase in the cells and they are able to enlarge.
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