1. The lymphatic system helps fight infections and diseases. It includes lymph vessels, lymph nodes, the spleen, thymus, tonsils, adenoids, and bone marrow.
2. Lymph nodes filter lymph fluid and trap germs and infected cells. They contain B cells and T cells that help the body fight infections.
3. Vaccines help the immune system learn to recognize and fight specific diseases. They contain weakened or killed forms of germs to trigger antibody production without causing illness.
1. The lymphatic system helps fight infections and diseases. It includes lymph vessels, lymph nodes, the spleen, thymus, tonsils, adenoids, and bone marrow.
2. Lymph nodes filter lymph fluid and trap germs and infected cells. They contain B cells and T cells that help the body fight infections.
3. Vaccines help the immune system learn to recognize and fight specific diseases. They contain weakened or killed forms of germs to trigger antibody production without causing illness.
1. Meristem tissue allows for plant growth and development through cell division. There are three types: apical, lateral, and intercalary.
2. Plant tissues are simple or complex. Simple tissues include epidermis, parenchyma, collenchyma, sclerenchyma, and cork. Complex tissues are xylem and phloem.
3. Plant organs include roots, stems, and leaves. Roots have primary and secondary tissues. Stems have regions of cell division, elongation and maturation. Leaves can be simple or compound.
1. Meristem tissue allows for plant growth and development through cell division. There are three types: apical, lateral, and intercalary.
2. Plant tissues are simple or complex. Simple tissues include epidermis, parenchyma, collenchyma, sclerenchyma, and cork. Complex tissues are xylem and phloem.
3. Plant organs include roots, stems, and leaves. Roots have primary and secondary tissues. Stems have regions of cell division, elongation and maturation. Leaves can be simple or compound.