Biology QUestions!! Please Help!?

Biology QUestions!! Please Help!?16) From the pulmonary veins, blood flow to the

a) left atrium
b) aorta
c) capillaries of the lungs
d) right atrium
e) posterior vena cava

17) Most carbon dioxide is carried from the body tissues to the lungs

a) by the trachea
b) dissolved in blood plasma
c) as hydrogen ions
d) combined with hemoglobin
e) as bicarbonate ions

23) In which of the following situations will helper T cells be activated?

a) in the bone marrow during the self tolerance test

b) when natural killer (NK) cells come in contact with a tumor cell

c)when a cytotoxic T cell releases cytokines

d) when B cells respond to T-independent antigens

e) when an antigen is displayed by a dendritic cell

These cells are involed in cell-mediated immunity & destroy virally infected cells

a)cytotoxic T cells
b) natural killer cells
c)helper T cells
d) nacrophages
e) B cells

Answer by adamodeh81
16. A
17. D
23. E

And cytotoxic T cells are generally associated with killing of virally infected cells, though NK cells are known to play a role in innate immunity.

Answer by rara avis
16)a
17)as bicarbonate ions in the plasma(around 70%)
23)E

cell mediated immunity is a function of the cytotoxic T cells after the cells has been identified with the MHC I complexes (major histocompatibility complex)

Answer by liminglun9
16 a
17 b
23 e
19 a

Add your own answer in the comments! Information about multiple myeloma and other plasma cell neoplasms.

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