1. what are the mechanisms by which cd4+ effector t cells activate other leukocytes? 2. How do the antigen receptors of lymphocytes recognize extremely diverse antigens and transmit activating signals to the cells?​

Anurse on a medical unit is administering heparin by continuous iv infusion to a client who has a pulmonary embolism. the client’s most recent aptt is 70 seconds. which of the following actions should the nurse take? a. increase the iv infusion rate. b. decrease the iv infusion rate. c. discontinue the iv infusion. d. continue the iv infusion.