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General Biology: Animal Form, Function, and Homeostasis

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  • What is homeostasis?

    Homeostasis is the steady-state physiological condition that organisms maintain to regulate their internal environment despite external changes.

  • How are animal form and function correlated?

    Animal anatomy (form) and physiology (function) are correlated at all levels, enabling survival and reproductive success by solving life challenges like nutrient uptake and reproduction.

  • What are the four main types of animal tissues?

    Epithelial, connective, muscle, and nervous tissues, each with unique structures and functions essential for organ and system operation.

  • What are the signaling molecules of the endocrine system?

    Hormones are chemical signals secreted into the blood to regulate physiology by targeting specific cells.

  • Why do hormones only affect target cells?

    Target cells have specific receptors for hormones, so only cells with the correct receptor respond to a given hormone.

  • Compare transmission time and duration of endocrine vs nervous systems.

    The endocrine system transmits signals slowly but with long-lasting effects; the nervous system transmits signals rapidly with short-lived responses.

  • What is a negative feedback loop?

    A process where a change triggers a response that counteracts the initial change, maintaining homeostasis.

  • What is a positive feedback loop?

    A process where a change triggers a response that amplifies the initial change, often leading to a specific outcome.

  • What is the general action of tropic hormones?

    Tropic hormones regulate the function of other endocrine glands by stimulating hormone release.

  • Describe the hormone cascade pathway regulating thyroid hormone.

    Low thyroid hormone triggers hypothalamus to release TRH, stimulating anterior pituitary to release TSH, which stimulates thyroid hormone production; high thyroid hormone inhibits TRH and TSH release.

  • Where are receptors for lipid-soluble hormones located?

    Receptors for lipid-soluble hormones are found inside the target cell, often in the cytoplasm or nucleus.

  • Where are receptors for water-soluble hormones located?

    Receptors for water-soluble hormones are located on the cell surface membrane of target cells.

  • What is thermoregulation?

    Thermoregulation is the process by which animals maintain their internal body temperature within a tolerable range.

  • Difference between endothermy and ectothermy?

    Endotherms generate heat metabolically (e.g., mammals), while ectotherms rely on external heat sources (e.g., reptiles).

  • What are the four processes of heat exchange with the environment?

    Radiation, evaporation, conduction, and convection are the main ways animals exchange heat with their surroundings.

  • What is osmoregulation?

    Osmoregulation is the control of water and solute balance within an organism to maintain homeostasis.

  • Difference between osmoconformers and osmoregulators?

    Osmoconformers match their internal osmolarity to their environment; osmoregulators actively regulate internal osmolarity regardless of environment.

  • What are the three forms of nitrogenous waste excreted by animals?

    Ammonia, urea, and uric acid are the main nitrogenous wastes, differing in toxicity and water requirements for excretion.

  • What are the four main steps of excretion in the kidney?

    Filtration, tubular reabsorption, tubular secretion, and water reabsorption are the key steps in urine formation.

  • What is the role of antidiuretic hormone (ADH) in water balance?

    ADH increases water reabsorption in kidney tubules by promoting aquaporin insertion, reducing urine volume and conserving water.