No, the stamen is a male part of a flower. The stamen produces pollen.
Answer: B voltage-gated potassium channels
Explanation:#
Tetraethylammonium is a pH- potassium channel blocker.
Therefore, it prevents the escape of potassium ions from the axoplasm, which makes it ( axoplam) positive from the rise in potassium ions concentration , since potassium ion is positive charged and intracellular ion . This initiate repolarization which returns to membrane state potential.
Since it is pH -potassium ion blocker; it does not affect the voltage-gated sodium ion channels, so action potential can occur. But after the sodium gated channels were closed,action potential drops but the concentration of potassium rises because :
1. They are naturally intracellular ions
2. They cannot leave the axoplasm because the channels has been shut. Therefore this stabilizes the membrane potential
The pathway will be;
The body cells becomes infected with a virus= then new viral proteins appear = class I MHC molecule-antigen complex displayed on cell surface.
Cytotoxic T cell is a T lymphocyte that kills cancer cells, cells that are infected or cells that are damaged in other ways. They are activated on the surface of antigen-presenting cells, which mature during the innate immune responses triggered by an infection.
The bacterial flora assists in the breakdown of foods that the stomach or small intestine missed and helps maintain digestion function The bacterial flora can synthesis vitamin k and b and is helpful barrier for immunity.
