If the radius of blood vessels of a person decreases, the blood pressure will increase. This is due to the increased resistance to blood flow caused by the narrowed vessels, leading to higher pressure exerted against the vessel walls.
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The hardest part of the body of a vertebrate animal is Enamel. Enamel is the outermost layer of teeth and is primarily composed of hydroxyapatite, making it extremely hard and durable, even harder than bone.
The hardest substance in the human body is Dentin. Dentin is a calcified tissue that forms the bulk of a tooth, providing structural support and protection. It is harder than both bone and nail.
The upper surface of the skin is called Epidermis. The epidermis is the outermost layer of the skin, providing a protective barrier against environmental factors and containing cells responsible for pigment production and keratinization.
The pigment that gives color to human skin is Melanin. Melanin, produced by melanocytes in the skin, determines skin tone and provides protection against the harmful effects of ultraviolet (UV) radiation from the sun.