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The skin weighs an average of four kilograms, covers an area of two square metres, and is made of three distinct layers: the epidermis, dermis, and subcutaneous tissue. [1] The two main types of human skin are: glabrous skin, the hairless skin on the palms and soles (also referred to as the "palmoplantar" surfaces), and hair-bearing skin. [3]
Trisomy 21. Down syndrome (also known by the karyotype 47,XX,+21 for females and 47,XY,+21 for males) [98] is mostly caused by a failure of the 21st chromosome to separate during egg or sperm development, known as nondisjunction. [91] As a result, a sperm or egg cell is produced with an extra copy of chromosome 21; this cell thus has 24 ...
An estimated 30% of individuals with autism spectrum disorders engage in self-harm at some point, including eye-poking, skin-picking, hand-biting, and head-banging. [ 58 ] [ 59 ] According to a meta-analysis that did not distinguish between suicidal and non-suicidal acts, self-harm is common among those with schizophrenia and is a significant ...
Parkinson's disease (PD), or simply Parkinson's, is a neurodegenerative disease of mainly the central nervous system that affects both the motor and non-motor systems of the body. The symptoms usually emerge slowly, and, as the disease progresses, non-motor symptoms become more common. Usual symptoms include tremors, slowness of movement ...
Lead poisoning, also known as plumbism and saturnism, is a type of metal poisoning caused by lead in the body. [2] Symptoms may include abdominal pain, constipation, headaches, irritability, memory problems, infertility, and tingling in the hands and feet. [1]
e. Borderline personality disorder (BPD), also known as emotionally unstable personality disorder (EUPD), [16] is a personality disorder characterized by a pervasive, long-term pattern of significant interpersonal relationship instability, a distorted sense of self, and intense emotional responses. [9][17][18] People diagnosed with BPD ...
Disability is the experience of any condition that makes it more difficult for a person to do certain activities or have equitable access within a given society. [1] Disabilities may be cognitive, developmental, intellectual, mental, physical, sensory, or a combination of multiple factors. Disabilities can be present from birth or can be ...
The study suggests that finger length has an effect on physical attraction because it gives indication of the desirable sex-hormone dependent traits which one may possess. [111] Another study found that averageness, healthiness of the skin, how fat the hands appear to be, and the grooming of the hands, all affect the attractiveness of hands. [113]