Question

Ch. 16.3; Red Blood Cells and p. 777 8^th edition) Blood crossing is

Group of answer choices

checking whether a person has anemia.

checking a person’s blood for the presence of Rh factor antibodies.

another name for a transfusion.

checking a person’s blood for aggregation interactions by adding their plasma to a blood sample.

checking a person’s red blood cells for aggregation interactions with test plasma.

(Ch. 16.5; Coagulation) How does plasmin dissolve clots?

Group of answer choices

It lyses fibrin polymers.

It activates tissue plasminogen activator (TPA).

It recruits neutrophils via chemotaxis to phagocytose the red blood cells at the clot.

It cleaves thrombin into an inactive form.

It activates plasminogen.

Answer 1

1) Blood crossing means to check the patient's blood group matching with the test plasma. In this, RBCs of patients are used which contain antigens over them. These antigens react with antibodies in the test plasma. This is not transfusion as it occurs before transfusion and it's just matching the blood. Patient's Rh antigen is checked, not Rh antibodies. Rh antibodies are present in the test plasma. It doesn't tell about the hemoglobin count of patient, hence anemia is not checked. Answer is last option.

2) Plasmin lyse the fibrin polymers.(ANSWER)

Plasmin don't activate t-PA.

It has no action on thrombin.

Plasmin don't activate plasminogen.

Neutrophils have no role in digesting fibrin clots.