Answer:
they support and connect other tissues, and does many other helpful things.
Answer:
1) cortical epithelial cells; (2) macrophages and dendritic cells
Explanation:
T cells, also known as T lymphocytes, are a fundamental type of cell of the immune system that determines the specificity of the immune response to specific foreign particles (antigens). T cells are produced in the Thymus (it is for that reason that they are called T cells) and then circulate throughout the bloodstream in order to recognize specific antigens in association with major histocompatibility complex (MHC) molecules on the surface of antigen-presenting cells (APC), such as macrophages and dendritic cells. T cells undergo positive and negative selection: 1- positive T-cell selection refers to the process by which T cells bind cortical epithelial cells that express Class I or Class II MHC molecules with enough affinity to get a survival signal; whereas negative selection occurs when T cells bind to macrophages and dendritic cells that express MHC specific receptors with a strong enough affinity to get an apoptosis (programmed cell death) signal.
Answer:
communities can offer after- school, summer learning, and recreation programs, locate library and cultural services near to schools, make neighborhoods safer and drug-free, encourage the development of business-school partnerships to create school-to-work programs, support schools' efforts to develop. Theres many things actually.
Explanation:
Answer:the Peyer's patches are located at the distal portion of the small intestine
Explanation:
Peyer's patches are a group of lymphoid follicles found in the mucus membrane that lines the small intestine, usually the ileum which is the distal part of the small intestine.
