Opsonization involves
A. cross-linking several antigens together so that they are no longer soluble, and it is facilitated by the Fc region of the antibody.
B. marking a target for phagocytosis, and it is facilitated by interaction of the Fc region of the antibody with a phagocyte.
C. activation of NK cells, and it is a function of the antigen-binding site of the antibody.
D. fixation of antibodies in the IgG and IgM classes, and it involves the antigen-binding site of the antibody.
B
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All of the following statements refer to events of tissue repair. Put the events in proper numbered order according to the sequence of occurrence. The initial event, the injury, is already indicated as number one.
1. The skin receives a cut that penetrates into the dermis and bleeding begins. 2. Epithelial regeneration is nearly complete. 3. Granulation tissue is formed. 4. Blood clotting occurs and stops the blood flow. 5. The scar retracts. 6. Macrophages engulf and clean away cellular debris. 7. Fibroblasts elaborate connective tissue fibers to span the break.
Buffering of lactic acid produced during anaerobic glycolysis in the Painted Turtle (Chrysemys picta) during winter is by
a. the carbon dioxide-carbonic acid buffers. b. the massive shell of the turtle. c. the phosphate buffers. d. the protein buffers. e. all of these.
Describe the synaptic cleft
What will be an ideal response?
If water intake (ingestion) is decreased, the kidney can decrease the amount of water excreted in urine by increasing the amount of water reabsorbed at the renal corpuscle
Indicate whether the statement is true or false.