BOTANY
BIOTECHNOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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John receives a replacement heart valve from a cow.
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Ann receives an artificial hip to ease her arthritis.
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Jack receives a kidney donated by her identical twin.
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Anita receives a pacemaker to regulate her heartbeat.
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Detailed explanation-1: -Tissue heart valve replacements, also known as biological or bioprosthetic valves, are harvested from pigs (porcine heart valves) or constructed from the tissue sac (the pericardium) surrounding the heart of a cow (bovine).
Detailed explanation-2: -In this procedure, surgeons insert a catheter into the leg or chest and guide it to the heart. A replacement valve is inserted through the catheter and guided to the heart. A balloon is expanded to press the valve into place. Some TAVR valves are self-expanding.
Detailed explanation-3: -The biological valves made from animal tissue are called xenografts while heart valves taken from a human–who has donated his/her heart–is called an allograft or, more commonly, a homograft.
Detailed explanation-4: -Mechanical valves are made from carbon and metal. Tissue (biological or bioprosthetic) valves are usually made from pig or cow tissue, or sometimes from human tissue (in which case they may be called homograft valves), that has been treated to make sure it is not rejected by the body.