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NervousSystem2
... variable wave of excitation. The wave is variable because different receptors are being stimulated at any particular moment in time. The receptors have their origin in stimuli that arise outside the body, e.g., heat, light, sound; and in stimuli that have their origin inside the body, e.g., pH, prop ...
... variable wave of excitation. The wave is variable because different receptors are being stimulated at any particular moment in time. The receptors have their origin in stimuli that arise outside the body, e.g., heat, light, sound; and in stimuli that have their origin inside the body, e.g., pH, prop ...
Systems and Balance in Organisms PAP Biology Test
... release of hormones into the bloodstream 13. What is a hormone? A chemical messenger molecule 14. What is a secretory cell? A specialized cell that secretes a hormone or hormones 15. What is a target cell? A cell that has a receptor for a particular hormone 16. Describe the difference between how a ...
... release of hormones into the bloodstream 13. What is a hormone? A chemical messenger molecule 14. What is a secretory cell? A specialized cell that secretes a hormone or hormones 15. What is a target cell? A cell that has a receptor for a particular hormone 16. Describe the difference between how a ...
Nervous System - Calgary Christian School
... Inhibitory or excitatory signal is received When the neurotransmitters bind to receptors, the permeability of the postsynaptic neuron is affected May cause an action potential if the threshold is reached ...
... Inhibitory or excitatory signal is received When the neurotransmitters bind to receptors, the permeability of the postsynaptic neuron is affected May cause an action potential if the threshold is reached ...
The Nervous System - Appoquinimink High School
... opening and allowing positive sodium into the cell. This makes it positive. And is called DEPOLARIZATION 2. Soon after potassium channels open and allow potassium in ions in again bringing the charge back to negative. This is called REPOLARIZATION ...
... opening and allowing positive sodium into the cell. This makes it positive. And is called DEPOLARIZATION 2. Soon after potassium channels open and allow potassium in ions in again bringing the charge back to negative. This is called REPOLARIZATION ...
Sensory organs and perception
... reaction. Aside from the differences in shape suggested by their names, rod and cone cells contain different light-processing chemicals (photopigments), perform different functions, and are distributed differently within the retina. Cone cells, which provide color vision and enable us to distinguish ...
... reaction. Aside from the differences in shape suggested by their names, rod and cone cells contain different light-processing chemicals (photopigments), perform different functions, and are distributed differently within the retina. Cone cells, which provide color vision and enable us to distinguish ...
A. Sensation
... Types of Pain (fast and slow) 1. fast pain a. occurs very rapidly after stimulus is applied b. acute, sharp, or prickling pain (knife cut, needle puncture) c. not felt in deeper tissues of body 2. slow pain a. begins a second or more after a stimulus is applied and then gradually increases in intens ...
... Types of Pain (fast and slow) 1. fast pain a. occurs very rapidly after stimulus is applied b. acute, sharp, or prickling pain (knife cut, needle puncture) c. not felt in deeper tissues of body 2. slow pain a. begins a second or more after a stimulus is applied and then gradually increases in intens ...
Slide 1
... • Myelin sheath – is a fat rich material that insulates electrical impulses • Schwann cells – form myelin sheath ...
... • Myelin sheath – is a fat rich material that insulates electrical impulses • Schwann cells – form myelin sheath ...
CHAPTER 6 PRINCIPLES OF NEURAL CIRCUITS.
... progresses from high frequencies at one end to low frequencies at the other. In the eye, the arrangement of receptors on the retina corresponds to position in the visual field. As a result, the receptor array contains a topographic representation or “map” of sound frequency, visual space; or other s ...
... progresses from high frequencies at one end to low frequencies at the other. In the eye, the arrangement of receptors on the retina corresponds to position in the visual field. As a result, the receptor array contains a topographic representation or “map” of sound frequency, visual space; or other s ...
NeuralCell-Neurons.stud
... • Short axons (shortest axons terminate only a few micron from cell body, interneurons) 3. Amacrine Neurons • An unusual cell type, lack axons ...
... • Short axons (shortest axons terminate only a few micron from cell body, interneurons) 3. Amacrine Neurons • An unusual cell type, lack axons ...
Chapter 11: Fundamentals of the Nervous System and Nervous Tissue
... Generation of action potential is now more difficult Must add up all the excitatory and inhibitory stimuli (summation) that are influencing the neuron to determine if an action potential will be sent (Fig 12.17 & 12.26) Action Potentials Action Potential (AP) = rapid change in membrane potential (po ...
... Generation of action potential is now more difficult Must add up all the excitatory and inhibitory stimuli (summation) that are influencing the neuron to determine if an action potential will be sent (Fig 12.17 & 12.26) Action Potentials Action Potential (AP) = rapid change in membrane potential (po ...
Chapter 12 - Mesa Community College
... Generation of action potential is now more difficult Must add up all the excitatory and inhibitory stimuli (summation) that are influencing the neuron to determine if an action potential will be sent (Fig 12.17 & 12.26) Action Potentials Action Potential (AP) = rapid change in membrane potential (po ...
... Generation of action potential is now more difficult Must add up all the excitatory and inhibitory stimuli (summation) that are influencing the neuron to determine if an action potential will be sent (Fig 12.17 & 12.26) Action Potentials Action Potential (AP) = rapid change in membrane potential (po ...
Sensation - Cloudfront.net
... the stimuli are various chemicals. On the surface of the tongue are receptors, called taste buds, for four basic tastes… sweet, salty, sour, and bitter. The function of the taste buds is to perform transduction, which is transforming chemical reactions into nerve impulses. ...
... the stimuli are various chemicals. On the surface of the tongue are receptors, called taste buds, for four basic tastes… sweet, salty, sour, and bitter. The function of the taste buds is to perform transduction, which is transforming chemical reactions into nerve impulses. ...
cell body
... lysosomes, Golgi complexes, ribosome etc. The proteins are needed for maintenance and repair, and for production of neurotransmitters and enzymes. Dendrites are highly branched, tapering processes which either end in specialized sensory receptors (as in primary sensory neurons) or form synapses ...
... lysosomes, Golgi complexes, ribosome etc. The proteins are needed for maintenance and repair, and for production of neurotransmitters and enzymes. Dendrites are highly branched, tapering processes which either end in specialized sensory receptors (as in primary sensory neurons) or form synapses ...
Physiology Ch 45 p543-557 [4-25
... -can elicit immediate reactions from brain or be stored as memories for up to years -somatic portion of sensory nervous system transmits sensory information from receptors of entire body surface and from some deep structures -and conducts through spinal cord at all levels, reticular substance of med ...
... -can elicit immediate reactions from brain or be stored as memories for up to years -somatic portion of sensory nervous system transmits sensory information from receptors of entire body surface and from some deep structures -and conducts through spinal cord at all levels, reticular substance of med ...
How Does the Brain Work?
... The primitive brainstem regulates balance, coordination and life-sustaining processes such as breathing and heartbeat. Throughout the brain, neurons communicate with one another through interlocking circuits. When a neuron is stimulated, it generates a tiny electrical current, which passes down a fi ...
... The primitive brainstem regulates balance, coordination and life-sustaining processes such as breathing and heartbeat. Throughout the brain, neurons communicate with one another through interlocking circuits. When a neuron is stimulated, it generates a tiny electrical current, which passes down a fi ...
Peripheral Nervous System
... Somatic & Autonomic Nerves • Somatic nerves control skeletal muscle, bones, skin that a person can control – Sensory neurons which relay info about environment to CNS Reflex Arc – Motor neurons which initiate appropriate response ...
... Somatic & Autonomic Nerves • Somatic nerves control skeletal muscle, bones, skin that a person can control – Sensory neurons which relay info about environment to CNS Reflex Arc – Motor neurons which initiate appropriate response ...
Chapter 12 Nervous System Cells
... • Action potential—the membrane potential of a neuron that is conducting an impulse; also known as a nerve impulse • Mechanism that produces the action potential (Figures 12-18 and 12-19) – An adequate stimulus triggers stimulus-gated Na+ channels to open, allowing Na+ to diffuse rapidly into the ce ...
... • Action potential—the membrane potential of a neuron that is conducting an impulse; also known as a nerve impulse • Mechanism that produces the action potential (Figures 12-18 and 12-19) – An adequate stimulus triggers stimulus-gated Na+ channels to open, allowing Na+ to diffuse rapidly into the ce ...
The NERVOUS SYSTEM
... All undisturbed cells are polarized Outside of cell has + charge, inside has – This is a potential difference, called membrane potential Unit = Volt (V) [cell membrane potential usu. measured in millivolts, ...
... All undisturbed cells are polarized Outside of cell has + charge, inside has – This is a potential difference, called membrane potential Unit = Volt (V) [cell membrane potential usu. measured in millivolts, ...
title of video - Discovery Education
... A neuron is a specialized cell for the transmission of information to other nerve cells, muscles or glands. ...
... A neuron is a specialized cell for the transmission of information to other nerve cells, muscles or glands. ...
Simplified view of how a neuron sends a signal
... That is, the neuron's plasma membrane does not actually touch the target cell's plasma membrane. This tiny area where the two membranes lie so close together is called the synapse. The gap between the cells is called the synaptic gap (Figure 2B); it's only several nanometers wide and is filled with ...
... That is, the neuron's plasma membrane does not actually touch the target cell's plasma membrane. This tiny area where the two membranes lie so close together is called the synapse. The gap between the cells is called the synaptic gap (Figure 2B); it's only several nanometers wide and is filled with ...
Human Physiology Essential Questions
... 1. Draw and label the digestive system. Describe how structure fits function in at least three ways for the digestive system. 2. Outline how cells get food. Include mechanical digestion, chemical digestion, pH, absorption, diffusion, and active transport in your answer. 3. Describe three functions o ...
... 1. Draw and label the digestive system. Describe how structure fits function in at least three ways for the digestive system. 2. Outline how cells get food. Include mechanical digestion, chemical digestion, pH, absorption, diffusion, and active transport in your answer. 3. Describe three functions o ...
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.