The Nervous System
... • Fibers that have myelin sheaths conduct impulses much faster because the nerve impulse literally jumps from node to node along the length of the fiber; “saltatory conduction” • No current can flow along the axonal membrane where there is no fatty insulation ...
... • Fibers that have myelin sheaths conduct impulses much faster because the nerve impulse literally jumps from node to node along the length of the fiber; “saltatory conduction” • No current can flow along the axonal membrane where there is no fatty insulation ...
Schwann cells
... The Schwann cell then rotates around the axon, wrapping its plasma membrane loosely around it in successive layers. ...
... The Schwann cell then rotates around the axon, wrapping its plasma membrane loosely around it in successive layers. ...
Nervous System Class Overview Questions
... 3. What is it about neurons (nerve cells) that make their properties different from those of other cells? In other words, what enables nerve cells to produce action potentials? 4. How is the an AP started and propagated? ...
... 3. What is it about neurons (nerve cells) that make their properties different from those of other cells? In other words, what enables nerve cells to produce action potentials? 4. How is the an AP started and propagated? ...
Nervous System
... Appear the jump from node to node. Speed of impulses is much faster on myelinated nerves then unmyelinated ones. Speed also increases with increase in diameter. Ex.) 120m/s skeletal muscle .5m/s skin. ...
... Appear the jump from node to node. Speed of impulses is much faster on myelinated nerves then unmyelinated ones. Speed also increases with increase in diameter. Ex.) 120m/s skeletal muscle .5m/s skin. ...
Ch.10
... Action Potentials • nerve impulse • occur on axons • all-or-none self-regenerating, because it spreads to adjacent regions of the membrane. •Summation- several subthreshold potential changes that combine to reach threshold. • refractory period • absolute - time when threshold stimulus does not star ...
... Action Potentials • nerve impulse • occur on axons • all-or-none self-regenerating, because it spreads to adjacent regions of the membrane. •Summation- several subthreshold potential changes that combine to reach threshold. • refractory period • absolute - time when threshold stimulus does not star ...
Introduction to Anatomy
... basic properties of their cell membranes: 1. There is an electrical voltage, called the resting membrane potential, across the cell membrane. 2. Their cell membranes contain a variety of ion channels (pores) that may be open or ...
... basic properties of their cell membranes: 1. There is an electrical voltage, called the resting membrane potential, across the cell membrane. 2. Their cell membranes contain a variety of ion channels (pores) that may be open or ...
chapter_12 - The Anatomy Academy
... secrete nerve growth factor promoting synapse formation electrical influence on synaptic signaling sclerosis – damaged neurons replace by hardened mass of astrocytes ...
... secrete nerve growth factor promoting synapse formation electrical influence on synaptic signaling sclerosis – damaged neurons replace by hardened mass of astrocytes ...
Notes Outline I (Part I)
... 15. The function of the cell body is to ________________________________________. 16. The axon hillock of the cell body __________________________________________. 17. Clusters of cell bodies that accumulate in the CNS are called __________________ and in the PNS are called ___________________. 18. ...
... 15. The function of the cell body is to ________________________________________. 16. The axon hillock of the cell body __________________________________________. 17. Clusters of cell bodies that accumulate in the CNS are called __________________ and in the PNS are called ___________________. 18. ...
The Nervous System: 1. Basics
... •! Voltage-gated potassium channels open –! K+ flows out of cell •! Loss of positive ions restores electronegativity of cytoplasm –! Na-channels close •! Cell interior ---> very negative (-90 mV) –! This patch of membrane is refractory to further stimulation for some time •! Ion imbalance triggers v ...
... •! Voltage-gated potassium channels open –! K+ flows out of cell •! Loss of positive ions restores electronegativity of cytoplasm –! Na-channels close •! Cell interior ---> very negative (-90 mV) –! This patch of membrane is refractory to further stimulation for some time •! Ion imbalance triggers v ...
Ch 48 Nervous System
... usually sl. More positive (-50 to -55 mV)…. The action potential is triggered…. ...
... usually sl. More positive (-50 to -55 mV)…. The action potential is triggered…. ...
Part 1 (nerve impulses, ppt file)
... and does in the heart. You can detect the changes in potential caused by this depolarization wave by using conductors placed on the body. This is called an electrocardiogram ...
... and does in the heart. You can detect the changes in potential caused by this depolarization wave by using conductors placed on the body. This is called an electrocardiogram ...
Chapter 12 - Neural Tissue
... BBB, control of environment structural framework & repairs regulation of ions, nutrients, gases ...
... BBB, control of environment structural framework & repairs regulation of ions, nutrients, gases ...
three basic functions of the nervous system
... Glial Cells 2. Oligodendrocytes: makes the myelin sheath that provides insulation around the axons in the CNS ...
... Glial Cells 2. Oligodendrocytes: makes the myelin sheath that provides insulation around the axons in the CNS ...
Nervous System
... action potential regulated? • Larger diameter axons conduct faster action potentials • Saltatory conduction….. ...
... action potential regulated? • Larger diameter axons conduct faster action potentials • Saltatory conduction….. ...
Cox Nervous System 2015
... Cell body – nucleus and metabolic center of the cell Processes – fibers that extend from the cell body ...
... Cell body – nucleus and metabolic center of the cell Processes – fibers that extend from the cell body ...
Basic anatomy and function of the nervous system
... • The autonomic nervous system (ANS) is controlled involuntarily and is sometimes called the visceral nervous system because its effectors are smooth muscle, cardiac muscle and glands found in the soft body organs. ...
... • The autonomic nervous system (ANS) is controlled involuntarily and is sometimes called the visceral nervous system because its effectors are smooth muscle, cardiac muscle and glands found in the soft body organs. ...
Chapter 12 () - Austin Community College
... surrounds some axons many layers of cell membrane wrapped around axon electrically insulates membrane of axon 1. PNS (Schwann cells) incomplete at birth formation continues for first year a. neurilemma - Schwann cell outer membrane and cytoplasm external to myelin sheath ...
... surrounds some axons many layers of cell membrane wrapped around axon electrically insulates membrane of axon 1. PNS (Schwann cells) incomplete at birth formation continues for first year a. neurilemma - Schwann cell outer membrane and cytoplasm external to myelin sheath ...
Chapter 12 () - Austin Community College
... surrounds some axons many layers of cell membrane wrapped around axon electrically insulates membrane of axon 1. PNS (Schwann cells) incomplete at birth formation continues for first year a. neurilemma - Schwann cell outer membrane and cytoplasm external to myelin sheath ...
... surrounds some axons many layers of cell membrane wrapped around axon electrically insulates membrane of axon 1. PNS (Schwann cells) incomplete at birth formation continues for first year a. neurilemma - Schwann cell outer membrane and cytoplasm external to myelin sheath ...
Dr. Melanie D. Osterhouse presents Action potentials and
... Rapid and transient (duration of about 1ms) Constant amplitude (100mV) All or none nerve impulse Travels in one direction (principle of dynamic polarization) ...
... Rapid and transient (duration of about 1ms) Constant amplitude (100mV) All or none nerve impulse Travels in one direction (principle of dynamic polarization) ...
PHYSIOLOGY OF THE NERVE
... Spontaneous discharge occurs normally in cardiac (heart beating) and smooth muscle (intestinal peristalsis) and many neurons in the CNS (rhythmic control of breathing). Spontaneous repetitive discharge occurs due to Na leak during the resting state. The RMP of such cells is about - 60 to -70 mv whic ...
... Spontaneous discharge occurs normally in cardiac (heart beating) and smooth muscle (intestinal peristalsis) and many neurons in the CNS (rhythmic control of breathing). Spontaneous repetitive discharge occurs due to Na leak during the resting state. The RMP of such cells is about - 60 to -70 mv whic ...
November 13th Notes (Nervous System)
... from the brain, or a series of chemical messengers carried in the blood. Through a series of adjustments, all systems of the body are regulated to maintain the internal environment within safe limits (homeostasis). ...
... from the brain, or a series of chemical messengers carried in the blood. Through a series of adjustments, all systems of the body are regulated to maintain the internal environment within safe limits (homeostasis). ...
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.