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Features that assist an organism to survive in a particular habitat.
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terms list

Features that assist an organism to survive in a particular habitat.
Affector neurons
Neurons that transmit information about changes in external or internal conditions to the central nervous system. Also called sensory neurons.
Antidiuretic hormone
Homrone which increases reabsorption of water into the blood from the distal tubules and collecting ducts of nephrons in the kidney.
Compound that when added to a fluid loewrs the freezing point of the fluid.
Exntension of a nerve cell along which impulses are transmitted away from that cell.
Cell body
Part of the neuron that contains the nucleus. Also called the soma.
Central nervous system
The part of the nervous system that is comprised of the brain and spinal cord.
Nerve cells found within the CNS which communicate between affector and effector neurons.
Countercurrent exchange
Arrangement of vascular tissues that enable heat to be transferred from a vessel carrying fluid from the core to an extremity, to a vessel carrying fluid from an extremity to the core.
Waxy outer layer on a leaf.
Branched extensions of nervve cells that transmit impulses to that cell.
Organism whose body temperature fluctuates with its surroundings.
Effector neurons
Neurons which transmit information from the central nervous system to muscle cells or glands. Also called motor neurons.
Endocrine system
Sytstem of ductuless glands that produce hormones which are released directly into the bloodstream.
Organisms whose body temperature is maintained by internal metabloic sources.
The maintentance of a relatively stable internal environment.
Organism that is able to maintain an internal body temperature within a narrow range. Endothermic.
In animals, chemicals produced in endocrine glands that are released into and transported via that bloodstream to other parts of the body where they act.
Region of the brain responsible for essential fuctions associated with the autonomic nervous system.
Excretory organs involved in osmoregulation.
Negative feedback
Feedback that tends to stabilize a process or conditions by reducing its rate or output when its effects are too great.
Nerve cells.
The maintenance of constant internal salt and water concentrations in internal fluids.
The net movement of water across a partially permeable membrane without an input of energy and down a concentration gradient.
Peripheral nervous system
Sub-branch of the nervous system involving all nerves that lie outside the brain and spinal cord.
Endocrine attached to the hypothalamus. Influences the production of thyroxine by the thyroid gland.
Organims whose body temperature varies with the external environment. Ectothermic.
Tolerance range
Extent of variation in an environmental factor within which a species can survive.
Loss of water from the surfaces of a plant.
Plants with characteristics that enable resistance to drought and life in very arid areas.

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