Which of the following is a vestigial organ of human being

• Vestigial organs are the structures which have no apparent function in a particular organism perhaps once they did. They appear to be a residual part of a past ancestor. • Charles Darwin listed a number of human vestigial organs, which he termed rudimentary, in The Descent of Man (1890). These included the muscles of the ear, wisdom teeth. the appendix, the tail bone, body hair, and the semilunar fold, in the corner of the eye. • Hence Appendixis a vestigial organ in the human body. • So, the correct answer is 'Appendix'.

The standard definition of ‘vestigial’ is an organ that once was useful in an animal’s evolutionary past, but that now is useless or very close to useless. The list of vestigial organs in humans has shrunk from 180 in 1890 to 0 in 1999. Evidently to salvage this once-critical support for evolution because the function it served decreased in importance or became totally unnecessary. This definition is problematic because it is vague and would allow almost every structure in humans to be labelled as vestigial. Classical definition of vestigial The question, ‘Do any vestigial organs exist in humans?’ (or any other life form for that matter), first requires a definition of ‘vestigial’. The most common definition of a vestigial organ throughout the last century was similar to the following: ‘Living creatures, including man, are virtual museums of structures that have no useful function but which represent the remains of organs that once had some use (emphasis mine).’ 1The authoritative reference The Evolution of Life 2 defines a vestigial organ as one ‘which has lost its function in the course of evolution, and is usually much reduced in size’. The standard anatomy authorities usually define a vestigial organ as referring to a once-useful organ that now is useless or very close to useless. Dorland’s Dictionary defines the term vestigial as ‘a vestige, trace or relic’, and defines the term as ‘the remnant of a structure which functioned in a previous stage of a species [evolutio...

Vestigial organs are the organs which were functional in theirpast but lost its function during the course of evolution. Human tailbone is also known as coccyx. The coccyx is a remnant of a tail from our ancestors. The tail in animals used for balancing their body and locomotion, as human started to walk using their legs these organs turned to be useless during the process of evolution.

The correct answer is Vermiform appendix. Mistake Points • The organ which is not vestigial in the body of humans is the nail. • A nail is a claw-like keratinized plate found at the top of fingers and toes and is responsible for protecting those tips. • They are still useful to humans. Vestigial organs are organs, tissues or cells in a body which are no more functional the way they were in their ancestral form of the trait. • It is authentication of evolution and hence, were helpful in explaining adaptation. • Such a structure can arise due to gene mutation which causes a change in the proteins. • In the population, the occurrence of such structures may, however, increase if it is beneficial enough. • In humans, the appendix is a good example of a vestigial organ. • This non-functioning organ eventually degenerates, shrinking in size and disappearing ultimately. Examples of Vestigial Organs: • Sinuses • Appendix • Coccyx • Wisdom Tooth • External Ear • Nictitating Membrane • Tonsils Key Points • Vermiform appendix, in anatomy, is a vestigial hollow tube that is closed at one end and is attached at the other end to the cecum, a pouch-like beginning of the large intestine into which the small intestine empties its contents. • Its function is to houseand cultivatebeneficial gut flora that can repopulate the digestive system following an illness that wipes out normal populations of this flora; providing a site for the production of endocrine cells in the fetus that produce mol...

In the context of human evolution, human vestigiality involves those traits occurring in humans that have lost all or most of their original function through evolution. Although structures called as vestigial often appear functionless, a vestigial structure may retain lesser functions or develop minor new ones. In some cases, structures once identified as vestigial simply had an unrecognized function. The examples of human vestigiality are numerous, including the anatomical (such as the human appendix, tailbone, wisdom teeth, pinna muscles and inside corner of the eye), the behavioral (goose bumps and palmar grasp reflex), sensory and molecular (noncoding DNA). Many human characteristics are also vestigial in other primates and related animals. Thus, the correct answer is option B.

[ "article:topic", "homologous structures", "vestigial structure", "adaptive radiation", "authorname:mgrewal", "showtoc:yes", "paleontologist", "comparative anatomy", "analogous structures", "comparative embryology", "cladogram", "cssprint:dense", "program:oeri", "licenseversion:30", "license:ck12", "source@https://www.ck12.org/book/ck-12-human-biology/" ] \( \newcommand\) • • • • • • • • • • • • • • A Horse Is a Horse, of Course, of Course This drawing was created in 1848, but it's likely that you recognize the animal it depicts as a horse. Although horses haven't changed that much since this drawing was made, they have a long evolutionary history during which they changed significantly. How do we know? The answer lies in the fossil record. Figure \(\PageIndex\): Horse Evidence from Fossils Figure \(\PageIndex\): Evolution of the Horse. The fossil record reveals how horses evolved. The lineage that led to modern horses (Equus) grew taller over time (from the 0.4 m Hyracotherium in early Eocene to the 1.6 m Equus). This lineage also developed longer molar teeth and the degeneration of the outer phalanges on the feet. Fossils are a window into the past. They provide clear evidence that evolution has occurred. Scientists who find and study fossils are called The oldest horse fossils show what the earliest horses were like. They were only 0.4 m tall, or about the size of a fox, and they had four long toes. Other evidence shows they lived in wooded marshlands, where they proba...

Vestigial organs and body parts refer to those that have little or no purpose in humans. They are a vestige left over from our ancestors. We have more than 100 vestigial anomalies, the most renowned of which are the appendix, wisdom teeth, coccyx, external ear, and male nipples. Charles Darwin suggested that vestigial organs serve as evidence for evolution. Most of the time, these parts go unnoticed, but every now and then they are detrimental to our health. Below, we review seven vestigial organs and body parts that, if we had to, we could do without. 1. The Appendix Our “vermiform process,” or appendix, is perhaps the best-known among or vestigial organs. It’s the small pouch that protrudes from the colon (large intestine) at the bottom right of the abdomen. In plant-eating mammals such as rodents and primates, the appendix helps digest cellulose. In humans, it is notorious for being the site of The appendix was believed until recently to have no function in humans. However, researchers theorized after a 2007 study that it might actually be useful as a “safe house” for the healthy bacteria that aid digestion. A more recent paper from 2017 suggested that the appendix may play a role in immunity, as it contains lymphoid material. While it may have a small role to play, those who have their appendix removed suffer no long-term ill effects (although there may be potential side effects from the surgery). Wisdom teeth are one of those vestigial body parts that sometimes cause ...