Across
- 3. An animal for which mechanisms of homeostasis moderate internal changes in a particular variable in the face of external fluctuation of that variable.
- 9. In homeostasis, a receptor that detects a stimulus.
- 14. A group of organs that work together in performing vital body functions
- 18. The steadystate physiological condition of the body.
- 19. Animal tissue that functions mainly to bind and support other tissues, having a sparse population of cells scattered through an extracellular matrix.
- 21. A fibrous connective tissue that joins bones together at joints
- 22. A nerve cell; the fundamental unit of the nervous system, having structure and properties that allow it to conduct signals by taking advantage of the electrical charge across its plasma membrane.
- 23. A fibrous connective tissue that attaches muscle to bone
- 25. In multicellular organisms, one of many types of secreted chemicals that are formed in specialized cells, travel in body fluids, and act on specific target cells in other parts of the organism, changing the target cells’ functioning.
- 26. Cells of the nervous system that support, regulate, and augment the functions of neurons.
- 27. A specialized center of body function composed of several different types of tissues.
Down
- 1. In animals, the internal system of communication involving hormones, the ductless glands that secrete hormones, and the molecular receptors on or in target cells that respond to hormones; functions in concert with the nervous system to effect internal regulation and maintain homeostasis.
- 2. In feedback regulation, a fluctuation in a variable that triggers a response.
- 4. Tissue consisting of long muscle cells that can contract, either on its own or when stimulated by nerve impulses.
- 5. A form of regulation in which accumulation of an end product of a process slows the process; in physiology, a primary mechanism of homeostasis, whereby a change in a variable triggers a response that counteracts the initial change.
- 6. An integrated group of cells with a common structure, function, or both.
- 7. Tissue made up of neurons and supportive cells.
- 8. In animals, the fast-acting internal system of communication involving sensory receptors, networks of nerve cells, and connections to muscles and glands that respond to nerve signals; functions in concert with the endocrine system to effect internal regulation and maintain homeostasis.
- 10. A phagocytic cell present in many tissues that functions in innate immunity by destroying microorganisms and in acquired immunity as an antigenpresenting cell.
- 11. A form of regulation in which an end product of a process speeds up that process; in physiology, a control mechanism in which a change in a variable triggers a
- 12. The processes and functions of an organism.
- 13. The fluid filling the spaces between cells in most animals.
- 15. (1) In cellular communication, the change in a specific cellular activity brought about by a transduced signal from outside the cell. (2) In feedback regulation, a physiological activity triggered by a change in a variable.
- 16. The structure of an organism
- 17. A type of cell in loose connective tissue that secretes the protein ingredients of the extracellular fibers.
- 20. An animal for which an internal condition conforms to (changes in accordance with) changes in an environmental variable.
- 24. point In homeostasis in animals, a value maintained for a particular variable, such as body temperature or solute concentration.