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  2. Acquired characteristic - Wikipedia

    en.wikipedia.org/wiki/Acquired_characteristic

    For example: The muscles acquired by a bodybuilder through physical training and diet. The loss of a limb due to an injury. The miniaturization of bonsai plants through cultivation techniques. Acquired characteristics can be minor and temporary like bruises, blisters, or shaving body hair.

  3. Iris (anatomy) - Wikipedia

    en.wikipedia.org/wiki/Iris_(anatomy)

    The iris consists of two layers: the front pigmented fibrovascular layer known as a stroma and, behind the stroma, pigmented epithelial cells.. The stroma is connected to a sphincter muscle (sphincter pupillae), which contracts the pupil in a circular motion, and a set of dilator muscles (dilator pupillae), which pull the iris radially to enlarge the pupil, pulling it in folds.

  4. Pupil - Wikipedia

    en.wikipedia.org/wiki/Pupil

    Light enters the eye through the pupil, and the iris regulates the amount of light by controlling the size of the pupil. This is known as the pupillary light reflex. The iris contains two groups of smooth muscles; a circular group called the sphincter pupillae, and a radial group called the dilator pupillae. When the sphincter pupillae contract ...

  5. Reproductive biology - Wikipedia

    en.wikipedia.org/wiki/Reproductive_biology

    Human reproductive biology is primarily controlled through hormones, which send signals to the human reproductive structures to influence growth and maturation.These hormones are secreted by endocrine glands, and spread to different tissues in the human body.

  6. Glossary of developmental biology - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_developmental...

    Also gastrocoel. The central internal cavity of the gastrula in most animal embryos, fated to develop into the lumen of the digestive tube ; the primitive gut. The archenteron initially has only one open end, known as the blastopore. B birth blastocoel Also blastocoele, blastocele, cleavage cavity, and segmentation cavity. The fluid-filled or yolk -filled cavity that forms in the developing ...

  7. Eye color - Wikipedia

    en.wikipedia.org/wiki/Eye_color

    Brown irises contain more or less melanin. Some eyes have a dark ring around the iris, called a limbal ring. Eye color in non-human animals is regulated differently. For example, instead of blue as in humans, autosomal recessive eye color in the skink species Corucia zebrata is black, and the autosomal dominant color is yellow-green. [101]

  8. The Flash Recap: Iris Is Pregnant! — Plus, Javicia Leslie ...

    www.aol.com/entertainment/flash-recap-iris...

    This Tuesday night, The Flash — and with eight final episodes to spare — at long last delivered on a key part of #WestAllen’s destiny, with the reveal that Iris is pregnant. OH, BABY! Fans ...

  9. Stroma of iris - Wikipedia

    en.wikipedia.org/wiki/Stroma_of_iris

    Some circle the circumference of the iris and the majority radiate toward the pupil. Blood vessels and nerves intersperse this mesh. In dark eyes, the stroma often contains pigment granules. Blue eyes and the eyes of albinos, however, lack pigment. Structure of the iris and surrounding parts showing the stroma of iris (stroma iridis).