_ are Y-shaped proteins that circulate through blood stream and bind to specific antigens thereby attacking microbes:
Correct answer: B. Antibodies
- A. Haemoglobin
- B. Antibodies
- C. Interferons
- D. Myoglobin
Explanation
Antibodies (also called immunoglobulin or Ig's) are Y-shaped proteins that circulate through the blood stream and bind to specific antigens, thereby attacking microbes. The antibodies are transported through the blood and the lymph to the pathogen invasion site.
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About Homeostasis
Homeostasis maintains a stable internal environment through the kidney and urinary system, thermoregulation and excretion. The kidney topics include filtration, selective reabsorption, urine formation and water balance, while thermoregulation involves sweating, vasodilation, vasoconstriction and hormonal control; excretion is different from egestion, which removes undigested food.
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