10.1 lymphatic system

Question 1

what does the lymphatic system do?

Answer 1

1. returns fluids and proteins that leak out of the blood vessels back to the circulatory system
2. produces lymphocytes (wbc), transports them around the body and provides them a place to mature

Question 2

what is lymph and lymphocytes?

Answer 2

lymph :contains fats, proteins and white blood cells including phagocytes and lymphocytes. movement of muscles pushes lymph along the lymph vessels
lymphocytes: group of wbc. the bone marrow is the site of lymphocyte production, some lymphocytes move to the thymus to mature.

Question 3

what are MHC markers?

Answer 3

class I:
1. found on the surface of all nucleated cells
2. present self-antigen
3. MHC I act as markers for self
4. all nucleated cells in the same organism carry the same ‘self’ class I MHC
class II:
1. found on the surface of some immune cells, such as macrophages.

Question 4

what are antigens?

Answer 4

1. triggers an immune response
2. molecules attached to the surface of pathogens/ cell fragments/ toxins produced by pathogens that circulate in the bodily fluids.
3. lymphocytes respond to antigens