Ch5 Vocab Flashcards
(32 cards)
Homeostasis
An organism maintaining a stable constant internal environment (physiological)
Stomata (Stomate)
The opening between two guard cells in the epidermis of a plant leaf through which gases are exchanged with the air
Sensory neurons
Nerve Cells that transmit information from a sense organ to the brain
Physiological response
An automatic change generated by the body of an organism that is triggered by an external or internal stimulus
Motor neurons
A nerve cell that conducts information to muscles or glands
Behavioral response
Actions taken by an organism in response to some stimulus
Reflexes
An involuntary reaction or response to a stimulus
Nervous system
A coordinating mechanism in almost all multicellular organisms that regulates internal body functions and response to external stimuli. In vertebrates, it consists of the brain, spinal cord, nerves, ganglia and receptor/effector organs.
Neurons
A nerve cell (brain, sensory and motor nerves are examples)
Negative feedback
A kind of feedback that creates equilibrium between input and output in a system or process
Positive feedback
A kind of feedback that disturbs or prevents equilibrium between input and output in a system or process
Dendrites
A structure that extends out from a neuron and transmits impulses toward the cell body
Axon
A structure that extends out from a neuron and conducts impulses away from the cell body
Stimulus
A change or signal in the internal or external environment that causes an adjustment or reaction by an organism
Synapse
An open junction between neurons, across which an impulse is transmitted by a chemical messenger called a neurotransmitter
Neurotransmitters
A chemical messenger that diffuses across the synapse and transmits a nerve impulse from one neuron to another
An organism maintaining a stable constant internal environment (physiological)
Homeostasis
The opening between two guard cells in the epidermis of a plant leaf through which gases are exchanged with the air
Stomata (Stomate)
Nerve Cells that transmit information from a sense organ to the brain
Sensory neurons
An automatic change generated by the body of an organism that is triggered by an external or internal stimulus
Physiological response
A nerve cell that conducts information to muscles or glands
Motor neurons
Actions taken by an organism in response to some stimulus
Behavioral response
An involuntary reaction or response to a stimulus
Reflexes
A coordinating mechanism in almost all multicellular organisms that regulates internal body functions and response to external stimuli. In vertebrates, it consists of the brain, spinal cord, nerves, ganglia and receptor/effector organs.
Nervous system
