Segmentation

question 94

Multiple Choice

Segmentation

• A) is the primary motility in the small intestine during digestion of a meal.
• B) is both mixing and propulsive.
• C) refers to sequential ring-like contractions that sweep downward, creating a stripping motion that pushes the chyme forward.
• D) both (a) and (b) above.
• E) all of these answers.

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Definitions:

Uncontrolled Cell Division

The process by which cells divide without regulation, often leading to tumor growth and cancer.

Cytotoxic T Cell

A kind of white blood cell that eliminates cancerous cells, cells infected mainly by viruses, or cells harmed in various manners.

MHC Class I

(Major Histocompatibility Complex Class I) are molecules found on almost all nucleated cells that present peptide antigens to the immune system, particularly to CD8+ T cells.

Antigen-Presenting Cell

A cell that displays antigen complexed with major histocompatibility complexes on their surfaces for recognition by T-cells, crucial in initiating an immune response.