87. True or False: Blood agglutination and blood clotting are different names for the same process....

87. True or False: Blood agglutination and blood clotting are different names for the same process.

90. True or False: In terms of affecting hormone action, synergism and permissiveness mean the same thing.

93. True or False: The thymus plays an important role in the development of T cells.

Solutions

Expert Solution

87. Blood agglutination and blood clotting are different names for the same process - False

Blood clotting is the process of converting blood into a semisolid jelly-like substance called clot which prevents excessive bleeding when a blood vessel is injured. It is amechanism involving platelets and the clotting factors.

Agglutination is the process of clumping of red blood cells if a blood group antigen is mixed with its corresponding antibody. Aggutination is a term used in blood grouping.

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90. In terms of affecting hormone action, synergism and permissiveness mean the same thing - False

The action of hormones can be permissive, synergistic, or antagonistic.

Permissiveness - a phenomenon in which the presence of one hormone is required for another hormone to exert its full effect. Eg- estrogen & progesterone

Synergism - Two or more hormones produce the same effects in a target cell. Eg - epinephrine & norepinephrine

Antagonism - Two hormones produce the opposite effects in a target cell. Eg- insulin and glucagon

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93. The thymus plays an important role in the development of T cells - True

The thymus is a primary lymphoid organ where the T-cells mature. T-lymphocytes originate from the haematopoietic stem cells in the bone marrow and mature in the thymus.

Whereas, B-lymphocytes (B-cells) are produced in the bone marrow and they mature in the bone marrow or in the lymph node

Sydney Mullin answered 10 months ago

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