Urobilin (urochrome) is a breakdown product of bilirubin, giving urine its characteristic yellow color. Bilirubin is in bile, hemoglobin in red blood cells, melanin in skin. Dark yellow urine indicates concentrated urine due to dehydration.
Consider the following statements about the immune system:
1. Macrophages are phagocytic cells.
2. B cells produce antibodies.
3. T cells are part of innate immunity.
Which of the above is/are correct?
Explanation:
Phagocytosis is receptor-mediated or non-specific engulfment of large particles, forming a phagosome that fuses with lysosomes. Key in immune defense.
Explanation:
Glycogen is a highly branched polysaccharide of glucose, the storage form in animals, found mainly in the liver and skeletal muscles. Starch is the plant equivalent. Cellulose is structural in plants, sucrose is a disaccharide. Glycogen can be rapidly mobilized to maintain blood glucose.
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