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Nervous System Cells
... • Multipolar – have only one axon but several dendrites • Bipolar – have only one axon and only one highly branched dendrite • Unipolar – have only a single process extending from the cell body ...
... • Multipolar – have only one axon but several dendrites • Bipolar – have only one axon and only one highly branched dendrite • Unipolar – have only a single process extending from the cell body ...
Nervous System
... Action potential -generated at axon hillock—results in a large spike in voltage across the membrane as ions flow across the axon membrane—this spike tends to travel down the axon to the axon terminus where it triggers neurotransmitter release at the synapse -only triggered when voltage at hillock i ...
... Action potential -generated at axon hillock—results in a large spike in voltage across the membrane as ions flow across the axon membrane—this spike tends to travel down the axon to the axon terminus where it triggers neurotransmitter release at the synapse -only triggered when voltage at hillock i ...
ANATOMICAL TERMS
... that carry out the body’s responses Somatic motor division – carriers signals to the skeletal muscles Visceral motor division (autonomic nervous system) – carriers signals to glands, cardiac muscles and smooth muscles Sympathetic division – tends to arouse body for action, accelerating the hea ...
... that carry out the body’s responses Somatic motor division – carriers signals to the skeletal muscles Visceral motor division (autonomic nervous system) – carriers signals to glands, cardiac muscles and smooth muscles Sympathetic division – tends to arouse body for action, accelerating the hea ...
Attending to Contrast
... stimulus was the same color or orientation as a previously presented stimulus. They found that paying attention to a particular stimulus location altered how neurons encoded visual information. When the difference between the second and first stimulus was small, the task was more difficult, and anim ...
... stimulus was the same color or orientation as a previously presented stimulus. They found that paying attention to a particular stimulus location altered how neurons encoded visual information. When the difference between the second and first stimulus was small, the task was more difficult, and anim ...
Nature Versus Nurture
... A neuron is an electrically excitable cell that processes and transmits information by electrical and chemical signaling Chemical signaling occurs via synapses, which are specialized connections with other cells. Neurons connect to each other to form networks ...
... A neuron is an electrically excitable cell that processes and transmits information by electrical and chemical signaling Chemical signaling occurs via synapses, which are specialized connections with other cells. Neurons connect to each other to form networks ...
Neurons
... Positively charged sodium ions flow in through the cell membrane If resting potential rises above threshold, an action potential starts to travel from the cell body down the axon Threshold - Each neuron receives excitatory and inhibitory signals from many neurons. ...
... Positively charged sodium ions flow in through the cell membrane If resting potential rises above threshold, an action potential starts to travel from the cell body down the axon Threshold - Each neuron receives excitatory and inhibitory signals from many neurons. ...
Lecture #13 – Animal Nervous Systems
... Especially important in rapid responses such as escape movements Also with controlling heart beat (but with specialized muscle tissue) ...
... Especially important in rapid responses such as escape movements Also with controlling heart beat (but with specialized muscle tissue) ...
The Biology of Mind
... Neurons do NOT touch each other- the space in between is call the synapse. ...
... Neurons do NOT touch each other- the space in between is call the synapse. ...
Sample Take-home Final Exam
... (6 pts) Visual information from the left visual field is processed in the right half of the brain. Does this mean that all the nerves carrying visual information from the left half of the body cross to the right side of the brain? What is the arrangement of visual information crossing the midline? W ...
... (6 pts) Visual information from the left visual field is processed in the right half of the brain. Does this mean that all the nerves carrying visual information from the left half of the body cross to the right side of the brain? What is the arrangement of visual information crossing the midline? W ...
10.2 Neurones
... single long fibre called an axon and smaller branched fibres called (4). Axons are surrounded by (5) cells, which protect and provide (6) because their membranes are rich in a lipid called (7). There are three types of neurone. Those that carry nerve impulses to the effectors are called (8) neurones ...
... single long fibre called an axon and smaller branched fibres called (4). Axons are surrounded by (5) cells, which protect and provide (6) because their membranes are rich in a lipid called (7). There are three types of neurone. Those that carry nerve impulses to the effectors are called (8) neurones ...
Supporting Cells of the Nervous System
... 2) act as phagocytes to clean up worn-out neuron organelles. 3) Electrically insulate neurons by forming a myelin sheath. 4) increase the speed of the action potential (electrochemical message) in those cells that have a myelin sheath. ...
... 2) act as phagocytes to clean up worn-out neuron organelles. 3) Electrically insulate neurons by forming a myelin sheath. 4) increase the speed of the action potential (electrochemical message) in those cells that have a myelin sheath. ...
Human Vision: Electrophysiology and Psychophysics
... This is done by the transmission of chemicals called neurotransmitters. Presynaptic neuron ...
... This is done by the transmission of chemicals called neurotransmitters. Presynaptic neuron ...
Word version - World Book Encyclopedia
... The brain decodes the signals as a sight, sound, smell, taste, touch, or other sensation. The message travels along the axon as an electrical impulse. Messages move from the brain through nerves and out to the body. A message enters the neuron through the dendrites and goes directly to the cell body ...
... The brain decodes the signals as a sight, sound, smell, taste, touch, or other sensation. The message travels along the axon as an electrical impulse. Messages move from the brain through nerves and out to the body. A message enters the neuron through the dendrites and goes directly to the cell body ...
The Nervous System Activity Sheet
... The brain decodes the signals as a sight, sound, smell, taste, touch, or other sensation. The message travels along the axon as an electrical impulse. Messages move from the brain through nerves and out to the body. A message enters the neuron through the dendrites and goes directly to the cell b ...
... The brain decodes the signals as a sight, sound, smell, taste, touch, or other sensation. The message travels along the axon as an electrical impulse. Messages move from the brain through nerves and out to the body. A message enters the neuron through the dendrites and goes directly to the cell b ...
Chapter 35 The Nervous System
... 3. dendrites- carries impulses toward the cell body. 4. axon- carries impulses away from the cell body. 5. myelin sheath- covers part of some axons. 6. synapse – at the end of the axon E. Nerve Impulse- an electrical impulse conducted along a nerve fiber. 1. resting potential- the electrical charge ...
... 3. dendrites- carries impulses toward the cell body. 4. axon- carries impulses away from the cell body. 5. myelin sheath- covers part of some axons. 6. synapse – at the end of the axon E. Nerve Impulse- an electrical impulse conducted along a nerve fiber. 1. resting potential- the electrical charge ...
I. The Nervous System
... 3. dendrites- carries impulses toward the cell body. 4. axon- carries impulses away from the cell body. 5. myelin sheath- covers part of some axons. 6. synapse – at the end of the axon E. Nerve Impulse- an electrical impulse conducted along a nerve fiber. 1. resting potential- the electrical charge ...
... 3. dendrites- carries impulses toward the cell body. 4. axon- carries impulses away from the cell body. 5. myelin sheath- covers part of some axons. 6. synapse – at the end of the axon E. Nerve Impulse- an electrical impulse conducted along a nerve fiber. 1. resting potential- the electrical charge ...
Eagleman Ch 3. Neurons and Synapses
... The soma receives 100s or 1000s of PSPs at a time. EPSPs sum together to depolarize the cell (move the voltage closer to 0). If the membrane voltage reaches threshold (approximately -60 mV), an action potential is generated at the axon hillock. ...
... The soma receives 100s or 1000s of PSPs at a time. EPSPs sum together to depolarize the cell (move the voltage closer to 0). If the membrane voltage reaches threshold (approximately -60 mV), an action potential is generated at the axon hillock. ...
Relating too much information without enough time to
... to grab someone’s attention and only 10 minutes to keep it.” ...
... to grab someone’s attention and only 10 minutes to keep it.” ...
NERVOUS SYSTEM
... Cranial nerves – 12 pairs of nerves originate from the brain to innervate the head and neck. Most cranial nerves are mixed, but some are sensory. Only the vagus nerve extends to thoracic and abdominal cavities. (Cranial nerves are listed in table 7.1.) Spinal nerves – 31 pairs of mixed nerves are fo ...
... Cranial nerves – 12 pairs of nerves originate from the brain to innervate the head and neck. Most cranial nerves are mixed, but some are sensory. Only the vagus nerve extends to thoracic and abdominal cavities. (Cranial nerves are listed in table 7.1.) Spinal nerves – 31 pairs of mixed nerves are fo ...
Nervous Regulation
... neurons. Connects the CNS to the ______ muscles, __________________________. 2. The _____________ Nervous System – Made up of only ______ neurons. Controls the internal organs of the body. The ANS has 2 divisions: 1. Parasympathetic Nervous System 2. Sympathetic Nervous System These 2 systems ar ...
... neurons. Connects the CNS to the ______ muscles, __________________________. 2. The _____________ Nervous System – Made up of only ______ neurons. Controls the internal organs of the body. The ANS has 2 divisions: 1. Parasympathetic Nervous System 2. Sympathetic Nervous System These 2 systems ar ...
Nervous System Notes - Mrs. Franco's Biology & Anatomy Page
... Astrocytes – star shaped cells ...
... Astrocytes – star shaped cells ...
Lect5
... • The membrane potential at which Na flowing into the cell exactly equals the K flowing out of the cell • A fraction more stimulus depolarization is required to ‘fire’ an action potential ...
... • The membrane potential at which Na flowing into the cell exactly equals the K flowing out of the cell • A fraction more stimulus depolarization is required to ‘fire’ an action potential ...
Test 3
... 1. List the structural and functional divisions of the nervous system, and describe their relationship to each other. Nervous system, CNS, PNS, Somatic, ANS. Sensory, integration, motor 2. Describe the types of glial cells, Schwann, oligodendrocyte 3. Explain the physiological characteristics of mat ...
... 1. List the structural and functional divisions of the nervous system, and describe their relationship to each other. Nervous system, CNS, PNS, Somatic, ANS. Sensory, integration, motor 2. Describe the types of glial cells, Schwann, oligodendrocyte 3. Explain the physiological characteristics of mat ...
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.