Which of the following statements about natural killer cells is FALSE? Which of the following statements about natural killer cells is FALSE? They destroy cells lacking MHC I. They destroy virus-infected cells. They are stimulated by an antigen. They destroy tumor cells.

They are stimulated by an antigen.

Explanation:

Natural killer cells are cytotoxic cells that help our body in innate immune response. These are an critical and important component of the innate immune system of our body. These natural killer cells provide a rapid response towards the virus infected cells. These cells have capability to detect MHC that are present on the infected cells. Natural killer cells do not require activation for killing those cells which are missing MHC I. Due to this feature, they are named as the Natural killer cells. These cells can directly induce the death of tumor cells and play an important role in immunosurveillance.

Explanation:

Natural killer cells are also known in short as NK cells.

2. NK cells are a type of lymphocyte and a component of innate immune system.  

3. They play a very important role in the host-rejection in virally infected cells and many other type of cells.

4.  They destroy cells those lacking MHC I.

5. They destroy tumor cells.

6. They destroy virus-infected cells.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.