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The Eye
The Eye

... Stimulus detection – a specialized sensory neuron Reception – where neurons receive information from the sensory neurons Integration – where information from receivers is processed ...
Classical Conditioning PPT
Classical Conditioning PPT

... response prior to conditioning  Unconditioned Stimulus (UCS): in classical conditioning, a stimulus that unconditionally naturally and automatically - triggers a response  Unconditioned Response (UCR): in classical conditioning, the unlearned, naturally occuring response to the UCS ...
lec#10 done by Dima Kilani
lec#10 done by Dima Kilani

...  postganglionic neurons release norepinephrine NE (noradrenaline NA) the major NT of the sympathetic system. It's released in the synapse between the postganglionic neuron and the effectors and interact with different adrenergic receptors on them (α1, α2, β1 , β2) the sympathetic effect on sweat g ...
NEUROTRANSMITTER TEST KIT (13 vials) - Life
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... only neurotransmitter used in the motor division of the somatic nervous system. Also the principal neurotransmitter in all autonomic ganglia. In cortex increases responsiveness to sensory stimuli; decreases heart rate and contraction strength, dilates blood vessels, increases peristalsis in the stom ...
Nervous System Overview
Nervous System Overview

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Sensory receptors
Sensory receptors

... • Basal cells generate new receptor cells every 1-2 months. • Supporting cells contain enzymes that oxidize hydrophobic volatile odorants. • Bipolar sensory neurons located within olfactory epithelium are pseudostratified. • Axon projects directly up into olfactory bulb of cerebrum. • Olfactory bulb ...
Chapter 15
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00216 - UROP
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The Nerve Impulse
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BIO 131
BIO 131

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How do bones, muscles, and nerves work together?

... • The peripheral nervous system consists of the sensory organs such as the eyes and ears and body nerves. • Nerves- are bundles of nerve cells or neurons. • Neuron- a specialized cell that can receive signals and transmit them to other neurons. • Sensory organs contain neurons called receptors. • Re ...
The Nervous System
The Nervous System

...  Connects CNS to all of your organ systems  Uses sensory neurons to detect stimuli  Uses motor neurons to carry signals from CNS to other ...
Build a neuron - Wake Forest University
Build a neuron - Wake Forest University

... • The body is made up of cells. • Each body part has different kinds of cells that perform different functions. The body’s nervous system is made up of specialized cells called nerve cells or neurons. • Neurons come in all kinds of shapes and sizes but they all have the same basic structure. The fol ...
Nervous System
Nervous System

... which has changed a variable from its set point • from eyes, skin, blood vessels, ears, digestive tract, joints, muscles, lungs… • Integration – interpretation of sensory information by the CNS • type, location and magnitude of stimulus • Transmit motor information – propagate APs from the CNS to va ...
Nervous System
Nervous System

... which has changed a variable from its set point • from eyes, skin, blood vessels, ears, digestive tract, joints, muscles, lungs… • Integration – interpretation of sensory information by the CNS • type, location and magnitude of stimulus • Transmit motor information – propagate APs from the CNS to va ...
No Slide Title
No Slide Title

... • Perception: our conscious interpretation of the external world – created by the brain based on information it receives from sensory receptors – interpretation of sensation ...
Nervous System - Winston Knoll Collegiate
Nervous System - Winston Knoll Collegiate

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Different types of cells in the human body undergo mitosis at
Different types of cells in the human body undergo mitosis at

... ...
THE CONTROL SYSTEMS
THE CONTROL SYSTEMS

... • The message that is transmitted through neurons is called an impulse. • It enters the neuron through the dendrite and is carried away from the cell body through the axon. ...
Nervous tissues
Nervous tissues

... There are three main types of neurons, which are classified according their function: Those that conduct impulses from the sensory organs to the central nervous system (brain and spinal cord) are called sensory (or afferent) neurons; those that conduct impulses from the central nervous system to the ...
Neuron PowerPoint
Neuron PowerPoint

... – Insulates the axon and speeds up the neural impulse ...
3-1-neuron _1
3-1-neuron _1

... – Insulates the axon and speeds up the neural impulse ...
Neuron PowerPoint
Neuron PowerPoint

... – Insulates the axon and speeds up the neural impulse ...
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Stimulus (physiology)



In physiology, a stimulus (plural stimuli) is a detectable change in the internal or external environment. The ability of an organism or organ to respond to external stimuli is called sensitivity. When a stimulus is applied to a sensory receptor, it normally elicits or influences a reflex via stimulus transduction. These sensory receptors can receive information from outside the body, as in touch receptors found in the skin or light receptors in the eye, as well as from inside the body, as in chemoreceptors and mechanorceptors. An internal stimulus is often the first component of a homeostatic control system. External stimuli are capable of producing systemic responses throughout the body, as in the fight-or-flight response. In order for a stimulus to be detected with high probability, its level must exceed the absolute threshold; if a signal does reach threshold, the information is transmitted to the central nervous system (CNS), where it is integrated and a decision on how to react is made. Although stimuli commonly cause the body to respond, it is the CNS that finally determines whether a signal causes a reaction or not.
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