Nervous System Overview
... • 10. How are sodium ions moved out of the neuron? There is a pump that uses energy to move three sodium ions out of the neuron for every two potassium ions it puts in. • 11. What role do Potassium ions play in action potential? At rest, potassium ions (K+) can cross through the membrane easily. Als ...
... • 10. How are sodium ions moved out of the neuron? There is a pump that uses energy to move three sodium ions out of the neuron for every two potassium ions it puts in. • 11. What role do Potassium ions play in action potential? At rest, potassium ions (K+) can cross through the membrane easily. Als ...
PNS Study Guide
... 6. What are the two functional classifications of the PNS? Describe the function of each (flow chart). 7. What are the 2 types of motor nerves? How are they different? 8. What are the 2 types of autonomic nerves? Make sure you know when they are used. 9. Be able to draw and describe a reflex arc. 10 ...
... 6. What are the two functional classifications of the PNS? Describe the function of each (flow chart). 7. What are the 2 types of motor nerves? How are they different? 8. What are the 2 types of autonomic nerves? Make sure you know when they are used. 9. Be able to draw and describe a reflex arc. 10 ...
Nervous System - WordPress.com
... • Stimulus excited neuron (Na+ rushes in) becomes depolarized • Depolarization activates neuron to transmit an action potential (nerve impulse) ▫ All-or-none response ▫ Impulse conducts down entire axon ...
... • Stimulus excited neuron (Na+ rushes in) becomes depolarized • Depolarization activates neuron to transmit an action potential (nerve impulse) ▫ All-or-none response ▫ Impulse conducts down entire axon ...
Nerve tissue for stu..
... C. Myelinated axons in the central nervous system (CNS) – myelin sheath is formed by processes of oligodendrocytes. One inetrnodal segment is formed by one process of oligodendrocyte. One oligodendrocyte can form more internodal segments by its processes. D. Non-myelinated axons in the CNS – axons a ...
... C. Myelinated axons in the central nervous system (CNS) – myelin sheath is formed by processes of oligodendrocytes. One inetrnodal segment is formed by one process of oligodendrocyte. One oligodendrocyte can form more internodal segments by its processes. D. Non-myelinated axons in the CNS – axons a ...
Biological Bases of Behavior : Quiz 1
... a. enzyme activation sites. b. voltage-dependent ion channels. c. second messenger binding proteins. d. neurotransmitter-dependent ion channels. ...
... a. enzyme activation sites. b. voltage-dependent ion channels. c. second messenger binding proteins. d. neurotransmitter-dependent ion channels. ...
chapter 10: nervous system i
... List, and discuss the structure and function of the four types of neuroglial cells in the CNS. ...
... List, and discuss the structure and function of the four types of neuroglial cells in the CNS. ...
Fundamentals of the Nervous System and Nervous Tissue
... • Whitish, fatty (protein-lipoid), segmented sheath around most long axons • It functions to: – Protect the axon – Electrically insulate fibers from one another – Increase the speed of nerve impulse transmission ...
... • Whitish, fatty (protein-lipoid), segmented sheath around most long axons • It functions to: – Protect the axon – Electrically insulate fibers from one another – Increase the speed of nerve impulse transmission ...
Membrane Potential
... Restricts passage of most substances into CNS • Oligodentrocytes-forms myelin sheaths in CNS ...
... Restricts passage of most substances into CNS • Oligodentrocytes-forms myelin sheaths in CNS ...
Dendritic cells in lymph organs are the neuro-immune cross
... adjacent to the innervated cells (arrows in A, B). There is a gap junction between this axon endings and cytomembrane, partially synaptic vesicles, mitochondria and smooth endoplasmic reticulum rich in denuded axon endings, rich in (arrows in C and D). These results give an indirect evidence of syna ...
... adjacent to the innervated cells (arrows in A, B). There is a gap junction between this axon endings and cytomembrane, partially synaptic vesicles, mitochondria and smooth endoplasmic reticulum rich in denuded axon endings, rich in (arrows in C and D). These results give an indirect evidence of syna ...
What is a neuron?
... • Neurilemma - external layer containing bulk of cytoplasm with nucleus and organelles (cell membrane) ...
... • Neurilemma - external layer containing bulk of cytoplasm with nucleus and organelles (cell membrane) ...
What is a neuron?
... • Neurilemma - external layer containing bulk of cytoplasm with nucleus and organelles (cell membrane) ...
... • Neurilemma - external layer containing bulk of cytoplasm with nucleus and organelles (cell membrane) ...
Lectures 26-27 Study Guide
... Microglia: immune cells in the CNS that protect against pathogens (similar to WBC) Oligodendrocytes (CNS) and Schwann (PNS) cells: form the myelin sheaths around axons. This increases the speed at which an action potential (AP) travels along the axon (more on this in Lecture 27). When comparing neur ...
... Microglia: immune cells in the CNS that protect against pathogens (similar to WBC) Oligodendrocytes (CNS) and Schwann (PNS) cells: form the myelin sheaths around axons. This increases the speed at which an action potential (AP) travels along the axon (more on this in Lecture 27). When comparing neur ...
2. Peripheral Nervous System
... 4) Refractory period – When the Na+/K+ balance returns to normal (K+ on inside and Na+ outside) • During this time the neuron will not respond to new impulses ...
... 4) Refractory period – When the Na+/K+ balance returns to normal (K+ on inside and Na+ outside) • During this time the neuron will not respond to new impulses ...
Nervous System
... • Neurons are supported structurally and functionally by supporting cells called neuroglia – 1/10th size of a neuron, but 10x more abundant – Schwann cells and Oligodendrocytes – produce the myelin sheaths in the PNS and the CNS, respectively • Myelin sheaths surround and insulate the axon of many t ...
... • Neurons are supported structurally and functionally by supporting cells called neuroglia – 1/10th size of a neuron, but 10x more abundant – Schwann cells and Oligodendrocytes – produce the myelin sheaths in the PNS and the CNS, respectively • Myelin sheaths surround and insulate the axon of many t ...
Learning Objectives
... Single process arises from body Branches into an axon and dendrite, eg Present in spinal and cranial ganglia ...
... Single process arises from body Branches into an axon and dendrite, eg Present in spinal and cranial ganglia ...
Chapt13 Lecture 13ed Pt 1
... What is the myelin sheath? Saltatory conduction? Schwann cell? Node of Ranvier? Explain the resting and action potential as they relate to a nerve impulse. How does the nerve impulse traverse the synapse? What are the 2 parts of the nervous system? What 3 things protect the CNS? What are the 4 parts ...
... What is the myelin sheath? Saltatory conduction? Schwann cell? Node of Ranvier? Explain the resting and action potential as they relate to a nerve impulse. How does the nerve impulse traverse the synapse? What are the 2 parts of the nervous system? What 3 things protect the CNS? What are the 4 parts ...
nervous system
... and they help to monitor Cerebrospinal fluid – Astrocytes- largest and most numerous, maintain the blood brain barrier, provide a structural framework for neurons, repair damaged tissue, guiding neuron development, control interstitial fluid ...
... and they help to monitor Cerebrospinal fluid – Astrocytes- largest and most numerous, maintain the blood brain barrier, provide a structural framework for neurons, repair damaged tissue, guiding neuron development, control interstitial fluid ...
The Nervous System
... – Glial cells/Schwann cells – Myelin sheaths (fast conduction of nerve impulses 150 m/s) – Nodes of ranvier ...
... – Glial cells/Schwann cells – Myelin sheaths (fast conduction of nerve impulses 150 m/s) – Nodes of ranvier ...
The Nervous System
... • Neurons transmit signals down axons by altering the flow of sodium and potassium ions across their membranes in response to chemical signals. The resulting imbalance of electrical charges inside vs. outside the axon creates an electrical voltage potential (an “action potential”) that is propagated ...
... • Neurons transmit signals down axons by altering the flow of sodium and potassium ions across their membranes in response to chemical signals. The resulting imbalance of electrical charges inside vs. outside the axon creates an electrical voltage potential (an “action potential”) that is propagated ...
Nervous 1 Green
... highway for the body and consists of many nerve cells (1). -Nervous systems are made up of two cell types: neurons, and glial cells(2). -Neurons work to monitor the conditions in and around the body(1). They give commands for responsive actions throughout the ...
... highway for the body and consists of many nerve cells (1). -Nervous systems are made up of two cell types: neurons, and glial cells(2). -Neurons work to monitor the conditions in and around the body(1). They give commands for responsive actions throughout the ...
Nervous system notes
... (1). Mainly na And k+ outside, na/k pump, cl-inside (2). About -70 millivolts b. Action potential=rapid depolarization of plasma membrane followed by repolarization as moving ions restore resting potential==nerve impulse p.247 c. Conduction of impulse=wave of ionic reversals as impulse travels down ...
... (1). Mainly na And k+ outside, na/k pump, cl-inside (2). About -70 millivolts b. Action potential=rapid depolarization of plasma membrane followed by repolarization as moving ions restore resting potential==nerve impulse p.247 c. Conduction of impulse=wave of ionic reversals as impulse travels down ...
What happens to the resting membrane potential of the membrane
... • Long appendages or processes: • Dendrites (receive info) • Axons (deliver info); some are covered by myelin ...
... • Long appendages or processes: • Dendrites (receive info) • Axons (deliver info); some are covered by myelin ...
Node of Ranvier
The nodes of Ranvier also known as myelin sheath gaps, are the gaps (approximately 1 micrometer in length) formed between the myelin sheaths generated by different cells. A myelin sheath is a many-layered coating, largely composed of a fatty substance called myelin, that wraps around the axon of a neuron and very efficiently insulates it. At nodes of Ranvier, the axonal membrane is uninsulated and, therefore, capable of generating electrical activity.