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CHAPTER NINE: THE NERVOUS SYSTEM
CHAPTER NINE: THE NERVOUS SYSTEM

... iii. Mechanically gated channelopen and close in response to physical deformation of receptors b. When gated channels are _______ i. Ions diffuse quickly across the membrane along their electrochemical gradients 1. Chemical gradients go from high to low 2. Electrical gradients go from low to high ii ...
Slide () - AccessAnesthesiology
Slide () - AccessAnesthesiology

... direct pathway from the striatum to the SNpr and GPi express primarily the excitatory D1 DA receptor, whereas the striatal neurons that project to the GPe and form the indirect pathway express the inhibitory D2 dopamine receptor. Thus, loss of the dopaminergic input to the striatum has a differentia ...
The NERVOUS SYSTEM
The NERVOUS SYSTEM

... Sensory info to thalamus and other centers, autonomic fx. ...
Central nervous system
Central nervous system

... Two types of neural cells in the nervous system:  Neurons  Process, transfer, and store information  Neuroglia – (also called “glial cells”)  Support and protect neurons ...
Nervous System Guided Notes
Nervous System Guided Notes

... The ________________________________________, which consists of all the nerves outside the brain and spinal cord. These receive stimuli and effect responses in muscles and glands. The peripheral nervous system can be further divided into: 1) _______________________________or sensory neurons - bring ...
Structure of the Brain PowerPoint Notes
Structure of the Brain PowerPoint Notes

... • GABA Keys – alcohol molecules so closely resemble those of the GABA neurotransmitter that alcohol can function like GABA keys and open GABA receptors – when GABA neurons are excited, they decrease neural activity REFLEX Reflex – unlearned, __________________reaction to some stimulus – neural conne ...
Autonomic nervous system
Autonomic nervous system

...  The longer they run, the more tired they get, of course; but at some point, the runners will “push through the wall” and “get their second wind.” ...
Nerve cells - Spark (e
Nerve cells - Spark (e

... The neurons are the nerve cells involved in the production and exchange of signals. They represent the functional unit of the nervous system. The majority of the neurons is characterized by 3 main areas: the cell body (also called soma), the dendrites and the axons. ...
MyersExpPsych7e_IM_Module 03 garber edited
MyersExpPsych7e_IM_Module 03 garber edited

... • Action Potentials are based on movements of ions between the outside and inside of the cell • When an Action Potential occurs a molecular message is sent to neighboring neurons ...
Autonomic Nervous System Period 5 Jacquelene Hanein, Karina
Autonomic Nervous System Period 5 Jacquelene Hanein, Karina

... cerebrum with spinal cord o relay of motor/sensory signals between brain and spinal cord o Controls life supporting autonomic functions of PNS ● Spinal Cord ...
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File

... on a wide range of bodily functions and also impact emotions. When they act on the brain, they influence our interest in sex, food, and aggression. A special type of hormone called ...
Early Brain Development
Early Brain Development

... The brain has different sections, each section controls a specific function. One of the most important parts is the cortex. The cortex is the part of the brain that its growth permits more complex learning. Neurons in the baby’s brain are tiny messengers that transmit information in the brain and ne ...
CNS Autonomic NS
CNS Autonomic NS

... within the receptor complex enables molecules to cross the cell membrane. Magnesium (Mg) blocks this channel. When Mg is removed from the channel and the receptor is activated, calcium (Ca++) and sodium (Na+) ions enter the cell and potassium ions (K+) leave. ...
Motor Neuron
Motor Neuron

... • Central nervous system (CNS) – Brain – Spinal cord • Peripheral nervous system (PNS) – Nerves outside the brain and spinal cord ...
Organization of the Nervous system. Physiology of neurons and glial
Organization of the Nervous system. Physiology of neurons and glial

... In the central nervous system • Gray matter – cell bodies and unmylenated fibers • Nuclei – clusters of cell bodies within the white matter of the central nervous system In the peripheral nervous system: ...
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Document

... The nervous system is one of the 2 control systems in our body. The nervous system is designed for fast action. It coordinates fast or rapid activities, such as muscle movement. Signaling is by electrical impulses, these are rapid, specific and produce an almost immediate response. ...
Peripheral Nerve Repair
Peripheral Nerve Repair

... Central & Peripheral Nervous System •Allows the Brain to control the body •crucial for human movement and function • Highway for information processing and response •Sensory Neurons- send stimulation information from senses to the brain. • Motor Neurons- send commands from the brain to muscles or ot ...
HORMONES AND BEHAVIOR 1. The Neuroendocrine System: Sum
HORMONES AND BEHAVIOR 1. The Neuroendocrine System: Sum

... 2. ___________________: coordinates motor responses involved in feeding behaviors; 3. ______________: receives signals from leptin & insulin, and project to paraventricular nucleus and lateral hypothalamus to • or ↓ feeding. ...
Central Nervous System
Central Nervous System

... Frontal lobe – voluntary motor activity (primary motor cortex), speaking, thought ...
Review questions: Neuroanatomy
Review questions: Neuroanatomy

... 1. Describe the neural organisation of the autonomic nervous system and the differences in the two divisions. 2. What are the three sympathetic ganglionic groups and where would you find them? 3. What's so special about the adrenal medulla? 4. Compare and contrast activation of the sympathetic and p ...
spinal cord
spinal cord

... control and coordination of life functions and activities 2 systems involved: 1. nervous- electrical system, brain,spine and nerves found in multicellular organisms 2. endocrine- chemical system, hormones found in all organisms Nervous System: definitions: a. stimulus- change in the internal or ex ...
Document
Document

... visceral organs, glands, and blood vessels • Autonomic reflex activity influenced by hypothalamus and higher brain centers • Sympathetic and parasympathetic divisions influence activities of enteric nervous system through autonomic reflexes – Enteric nervous system can function independently of CNS ...
Note: This hypothesis is mainly concerned with peripheral neurons
Note: This hypothesis is mainly concerned with peripheral neurons

... In vitro assays have shown that NTs enhance both axonal and dendritic growth In vivo, the situation is more difficult to study Why? In standard knockouts, it is difficult to separate the survival effects of NTs from their effects on the morphology of neurons. This problem has begun to be addressed ...
Anatomy of the Nervous System
Anatomy of the Nervous System

... – Functional units of nervous system (conduct electricity) • Sensory neurons – “afferent neurons” – Sense and relay info (stimuli) from environment to CNS » (ex// photoreceptors, chemoreceptors, thermoreceptors, etc.) » Ganglia: clusters of sensory receptors. ...
intro anat 1 - mshsRebeccaMazoff
intro anat 1 - mshsRebeccaMazoff

... the formation of specialized tissues, organs, ...
< 1 ... 242 243 244 245 246 247 248 249 250 ... 274 >

Circumventricular organs

Circumventricular organs (CVOs) are structures in the brain that are characterized by their extensive vasculature and lack of a normal blood brain barrier (BBB). The CVOs allow for the linkage between the central nervous system and peripheral blood flow; additionally they are an integral part of neuroendocrine function. The lack of a blood brain barrier allows the CVOs to act as an alternative route for peptides and hormones in the neural tissue to the peripheral blood stream, while still protecting it from toxic substances. CVOs can be classified into (a) sensory and (b) secretory organs. The sensory organs include the area postrema (AP), the subfornical organ (SFO) and the vascular organ of lamina terminalis. They have the ability to sense plasma molecules and then pass that information into other regions of the brain. Through this, they provide direct information to the autonomic nervous system from the systemic circulation. The secretory organs include the subcommissural organ (SCO), the posterior pituitary, the pineal gland, the median eminence and the intermediate lobe of the pituitary gland. These organs are responsible for secreting hormones and glycoproteins into the peripheral vascular system using feedback from both the brain environment and external stimuli.All of the circumventricular organs, besides the SCO, contain extensive vasculature and fenestrated capillaries which leads to a ‘leaky’ BBB at the site of the organs. Furthermore, all CVOs contain neural tissue, allowing them to play a role in the neuroendocrine system. It is highly debated if the choroid plexus can be included as a CVO. It has a high concentration of fenestrated capillaries, but its lack of neural tissue and its primary role of producing cerebrospinal fluid (CSF) usually excludes the choroid plexus from the CVO classification.Research has also linked CVOs to body fluid regulation, cardiovascular functions, immune responses, thirst, feeding behavior and reproductive behavior.
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