Answer:
Nope, I didn't
Explanation:
Goes to show that you learn something new everyday!
Its main purpose is to restore partial flow of oxygenated blood to the brain and heart. ♥
D. having trouble relaxing
The second one is correct
Answer:
There are 3 main types of T cells: cytotoxic, helper, and regulatory. Each of them has a different role in the immune response. Cytotoxic T cells (Tc cells) have a co-receptor called CD8 on their cell surface. CD8 partners with the T cell receptor and with MHC class I molecules, acting as a sort of bridge.
Explanation:
