Question

the four paired lymph trunks. sar 8ockurao 3. The thoracic duct begins as an enlarged sac called the C esoa day 4. The lymph ducts return lymph to the venous circulation at the junction of which two veins on either side of the body? 24 Activity 4: Using a Pregnancy Test to Demonstrate Antigen-Antibody Reactions 1. In an ELISA, a. the primary antibody binds to which molecule? b. the enzyme is attached to which molecule? c. the final step is the addition of which molecule? d. the secondary antibody binds to which molecule? 2. In a positive pregnancy test, which antigen is detected in urine? PART II. Putting It All Together A. Review Questions Answer the following questions using your lecture notes, your textbook, and/or your lab notes. 1. To which two organ systems does the thymus belong? UNIT 24 1 The Lymphatic System 524

Answer 1

The lymph ducts drain the lymph into the brachiocephalic vein, at the junction of subclavian vein and the internal jugular vein.

1)

Antigen + primary antibody bind first

Then secondary antibodies bind having the enzyme.

Then chromogenic substrate is added on which the enzyme acts,producing color.

a)The primary antibody binds to the target antigen.

b)The enzyme is attached to the second antibody .

c)Final step is the addition of the chromogenic substrate.

d)The secondary antibody binds to the primary antibody.

2) The antigen detected in the urine is hCG (Human chorionic gonadotropin).