Concept explainers
Introduction:
Blood is a connective tissue which connects all the organs and organ systems of the body. It consists of cells and cell fragments which are suspended in fluid matrix plasma. It is the most visible and important component of the human circulatory system. Red blood cells, white blood cells, and platelets are present in the blood.
Answer to Problem 1MCQ
Correct answer:
White blood cells are responsible for the production of antibodies. Hence, the correct answer is option b..
Explanation of Solution
Reason for correct answer:
Option b. is given as “White blood cell: produces antibodies.”
White blood cells are soldier cells and are an integral part of the immune system. They fight against any foreign antigen which enters inside the body. This defense mechanism secretes certain chemicals which are known as antibodies. These antibodies fight against the antigens and remain in the body in a dormant state. These antibodies become active when similar antigens enter the body again to fight against it.
Reason for incorrect answer:
Option a. is given as, “Red blood cell: initiates clotting.”
Red blood cells are responsible for the transportation of oxygen and carbon dioxide in and out of the cells with the help of hemoglobin. Clotting is initiated by cell fragments platelets present in the blood. Hence, option a. is incorrect.
Option c. is given as, “Platelet: carries oxygen and carbon dioxide.”
Platelets are responsible for clotting blood in case of any injury to the blood vessels. Oxygen and carbon dioxide is transported by hemoglobin present in the red blood cells. Hence, option c. is incorrect.
Option d. is given as “plasma: engulfs and destroys foreign bodies.”
Plasma is the fluid matrix of blood in which all the blood cells and cell fragments are suspended. Engulfing and destroying foreign bodies are carried out by the white blood cells as their defense mechanism. Hence, option d. is incorrect.
Hence, the options a.,c.and d. are incorrect.
Antibodies are specifically produced by the white blood cells. Thus, the correct option is b..
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Chapter 27 Solutions
Biology
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