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from article Parasympathetic nervous system

Overview of parasympathetic pathways of the human autonomic nervous system. Preganglionic axons from the brain and spinal cord innervate the viscera in the head, neck, and trunk. (Copyright © McGraw Hill)

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from article Fertilization (animal)

Photomicrograph (tinted green) of mouse sperm bound to the zona pellucida of an unfertilized egg under laboratory conditions (in vitro). (Credit: K. O. Kalthoff)

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from article Fertilization (animal)

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from article Chemical senses

The sense of smell (olfaction) is a key chemical sense in vertebrates. (Left) Taste buds of the oral cavity, especially the tongue, are composed of modified epithelial cells responsive to chemicals in solution. (Right) Bitter, sour, salty, and sweet…

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from article Pigmentation

Colorful flower of Mirabilis jalapa. The colors of the flowers of this plant can vary as a result of different plant pigments. (Credit: F. D. Richards)

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from article Pigmentation

Zebrafish are often studied as model organisms for research dealing with skin pigmentation. (Credit: Lynn Ketchum/Oregon State University)

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from article Neurohypophysis hormone

Structure of neurohypophysial hormones. Each neurohypophysial hormone is made up of nine amino acid residues with two half cysteines joined by a disulfide bridge to form a ring structure. Vasotocin is found in fishes and fetal pituitaries, while…

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from article Peroxisome

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from article Bipolar disorder

Prevalence of bipolar disorder in adults. The bar graph shows the percent of the U.S. adult population affected by bipolar disorder as it relates to age. (Credit: National Institute of Mental Health)

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from article Enzyme inhibition

Enzyme inhibition often works by preventing a substrate from attaching to an active enzyme. In this example, E1 is one of three sequential enzymes that will convert a substrate (S) into a product (P). However, the product that is created can then…