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Aminotes definitions Flashcards

Aminotes definitions
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  • Chorion

    The outermost membrane in an egg, providing protection and facilitating gas exchange for the developing embryo.

  • Amnion

    A fluid-filled membrane that encases and cushions the embryo, providing a protective environment during development.

  • Yolk Sac

    A yellow, nutrient-rich membrane in an egg that supplies food to the developing embryo, connected to the embryo's gut via blood vessels.

  • Elantois

    A membrane in amniotic eggs that stores embryonic waste and facilitates gas exchange through its blood vessels.

  • Albumin

    A protein-rich solution in egg whites that cushions the embryo and provides essential nutrients.

  • Ectothermic

    Organisms that rely on external environmental heat sources to regulate their body temperature, as opposed to generating significant internal heat.

  • Tetrapods

    Four-limbed vertebrates including amphibians, reptiles, birds, and mammals, adapted for life on land with limbs that support weight and facilitate movement.

  • Keratin

    A fibrous structural protein found in hair, nails, animal horns, and reptile scales, providing protection and reducing water loss.

  • Endothermic

    Organisms that regulate their body temperature internally through metabolic processes, maintaining a stable temperature regardless of external conditions.

  • Monophyletic

    A group of organisms that includes an ancestor and all its descendants, forming a single branch on the tree of life.

  • Sauropsids

    Amniotes including reptiles and birds, characterized by keratin scales or feathers, internal fertilization, and adaptations for terrestrial life.

  • Synapsids

    Amniotes that include mammals, distinguished by a single temporal fenestra in the skull, evolving from reptilian ancestors to modern mammals with features like hair and differentiated teeth.

  • Mammary Glands

    Specialized glands in mammals that produce milk to nourish offspring, primarily composed of water, fat, and sugar.

  • Neocortex

    The brain region in mammals responsible for higher-order functions like sensory perception, cognition, and motor commands, significantly contributing to advanced intelligence and complex behaviors.