The ash in the atmosphere blocks the sunlight.
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Answer:
Plants are autotrophs, which means they produce their own food. They use the process of photosynthesis to transform water, sunlight, and carbon dioxide into oxygen, and simple sugars that the plant uses as fuel.
Explanation:
Answer:
The kidney is an organ that is part of the urinary system.
Explanation:
The kidney's function is to filter out waste from your blood. It requires water and your blood to maintain balance in your body. The waste from your blood and the water will go out as urine.
Answer:
Explanation:
Lymphocytes are the agranular cells of WBC. These are mainly 2 types - T lymphocyte and B- lymphocytes. Natural killer cells/ NK cells are also another type of lymphocyte. The lymphocytes are present in both blood and lymph. They play are responsible for both innate and adaptive immunity.
The natural killer cells are meant for both innate immunity and adaptive immunity. The T cells and B cells are responsible for adaptive immunity.
The humoral immunity is mediated by B cells while T cells are mediated the cell-mediated immunity. When an antigen enters into the body the B cells get to activate and it becomes effector B cells. These B cells are proliferated by mitosis and produce plasma cells. Plasma cells have antibodies which provide adaptive immunity.
Both the B lymphocytes and T lymphocytes are synthesized in the bone marrow. This process is called hematopoiesis. Then these 2 types of cells are separated and mature in different cells. Therefore, bone marrow is the precursor of B cells and T cells.
B lymphocytes are matured in bursa or MALT cells, while the T lymphocytes are matured in the thymus.
T cells are not the only form of lymphocytes found in lymphoid tissues. The lymphoid tissues are - bone marrow cells, WBC, thymus, spleen, lymph nodes. Macrophages are the larger WBC and one form of monocytes.
