★ Circulatory System and Nutrition Quiz
To pump and circulate blood is the work of which organ?
A. lungs
B. liver
C. pancreas
D. heart
Select your answer:
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Movement › ViewWhere are blood cells made?
A. Stomach
B. Pancreas
C. Bone Marrow
D. Feet
Microbiology › View
Cytotoxic T cells
A. secrete granzymes and perforins that damage target cells.
B. lack specificity for antigen.
C. secrete interleukin-2 to stimulate B and T cells.
D. are activated by free, soluble antigens.