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bone marrow Answer-A soft tissue inside the bone that produces blood cells
Thymus Answer-Gland in the thoracic cavity above the heart where T lymphocytes
mature.
bone marrow and thymus Answer-immune cells differentiate form progenitor cells in
these 2 lymphoid organs
blood vessels Answer-A majority of mature immune cells move through out ______
_______
Circulating leukocytes Answer-mature immune cells that flow through blood vessels
tissues Answer-these barriers send invading mircroorganisms and help in response
tissue-resident sentinel cells Answer-these cells function to sense microbes and respond
to infections
sentinel Answer-A sentry; one who keeps watch
Lymphocytes Answer-(immune cells)greatly make up the lymphatic system