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ayoismeisalex
10.03.2020 •
Biology
The pinkish hue of individuals with fair skin is the result of the crimson color of oxygenated hemoglobin (contained in red blood cells) circulating in the dermal capillaries and reflecting through the epidermis.
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Ответ:
The pinkish hue of individuals with fair skin is the result of the crimson color of oxygenated hemoglobin (contained in red blood cells) circulating in the dermal capillaries and reflecting through the epidermis- is a true statement.
Explanation:
The color of skin of an individual is due to the presence of three main pigments present in the integumentary system – melanin, hemoglobin, and carotene.
Melanin released by the melanocytes gives a black to brown complexion depending upon the number of pigments present.
Carotene obtained through dietary sources gets accumulated in dermal layers and gives a yellow-orange tinge to the complexion.
The hemoglobin, which contains the red colored pigment ‘heme’ is the reason for the pink hue of fair skinned people. This hemoglobin present in the dermal capillaries running through the entire length integumentary system adds the unique pink hue to the fair complexion. So higher levels of oxygenated blood and skin blood perfusion lead to bright skin coloration.
Ответ:
The alternation of generations in the life cycle of a plant includes the diploid and haploid multicellular stages. diploid and haploid are copies of the chromosomes. The spores in the plant is unicellular and when they start dividing through mitosis, it produces identical cells. These identical cells are all haploid. Haploid stages contain one set of chromosome from either of the parent. These identical cells create a multicellular system called the gametophytes. A gametophyte is the haploid multicellular stage in the life cycle of a plant. The gametophyte makes the gametes. These gametes are responsible for sexual fertilization. It takes place when a sperm (male gametes) from the male fuses into the egg cell (female gametes) of the female. The formation of both male and female gametes creates a diploid zygote. Diploid stages contain one set of chromosome from each parent. This is where the sporophyte comes in. A sporophyte is the diploid multicellular stage in the life cycle of the plant. It now contains the two sets of chromosomes from each parent.