Chapter 48 Nervous System
... Many vertebrate axons are surrounded by a myelin sheath. Myelin increases the conducting speed of action potentials by insulating the axon membrane. The voltage-activated ion Na+ and K+ channels are concentrated at the nodes called nodes of Ranvier where the membrane is in contact with the interstit ...
... Many vertebrate axons are surrounded by a myelin sheath. Myelin increases the conducting speed of action potentials by insulating the axon membrane. The voltage-activated ion Na+ and K+ channels are concentrated at the nodes called nodes of Ranvier where the membrane is in contact with the interstit ...
AP Biology Animal Form and Function
... 3. Repolarization—In response to the inflow of Na+, another kind of gated channel opens, this time allowing the K+ on the inside to rush out of the cell. The movement of K+ out of the cell causes repolarization by restoring the original membrane polarization (a condition where it is once again more ...
... 3. Repolarization—In response to the inflow of Na+, another kind of gated channel opens, this time allowing the K+ on the inside to rush out of the cell. The movement of K+ out of the cell causes repolarization by restoring the original membrane polarization (a condition where it is once again more ...
NERVOUS SYSTEM
... Thus, the AP is propagated along the axon by being regenerated by voltage gated Na+ channels along that axon. In order for this to proceed: The density of v. gated Na+ in a membrane of an axon must be constant for that axon to propagate ...
... Thus, the AP is propagated along the axon by being regenerated by voltage gated Na+ channels along that axon. In order for this to proceed: The density of v. gated Na+ in a membrane of an axon must be constant for that axon to propagate ...
Organization of the Nervous System and the Neuron
... •A stimulus excites the neuron to become and generate an impulse ...
... •A stimulus excites the neuron to become and generate an impulse ...
05 Bioelectrical phenomena in nervous cells
... Forces that determine ionic movement Electrostatic forces Opposite charges attract Identical charges repel Concentration forces Diffusion – movement of ions through semipermeable membrane Osmosis – movement of water from region of high concentration to low ...
... Forces that determine ionic movement Electrostatic forces Opposite charges attract Identical charges repel Concentration forces Diffusion – movement of ions through semipermeable membrane Osmosis – movement of water from region of high concentration to low ...
View document as PDF
... The boundaries of a cell are determined by the presence of a lipid bilayer known as the cell membrane. This nonpolar structural feature enables the cell to have specific characteristics within the intracellular compartment relative to its extracellular environment. In order to maintain a constant en ...
... The boundaries of a cell are determined by the presence of a lipid bilayer known as the cell membrane. This nonpolar structural feature enables the cell to have specific characteristics within the intracellular compartment relative to its extracellular environment. In order to maintain a constant en ...
Physiology
... distribution of ions (atoms with a positive or negative charge) on the two sides of the nerve cell membrane. This POTENTIAL generally measures about 70 millivolts (with the INSIDE of the membrane negative with respect to the outside). So, the RESTING MEMBRANE POTENTIAL is expressed as -70 mV, and th ...
... distribution of ions (atoms with a positive or negative charge) on the two sides of the nerve cell membrane. This POTENTIAL generally measures about 70 millivolts (with the INSIDE of the membrane negative with respect to the outside). So, the RESTING MEMBRANE POTENTIAL is expressed as -70 mV, and th ...
The peripheral nervous system-
... the basal lamina remains intact at the site of axon interruption, such as occurs in a nerve crush injury, the regenerating axons are directed towards their original target and full functional recovery can occur (Thomas, 1974). Recent evidence that Schwann cells deprived of axonal contact in the dist ...
... the basal lamina remains intact at the site of axon interruption, such as occurs in a nerve crush injury, the regenerating axons are directed towards their original target and full functional recovery can occur (Thomas, 1974). Recent evidence that Schwann cells deprived of axonal contact in the dist ...
52 Nerve Tissue
... and may form a network or basket-like arrangement around postsynaptic neurons. The cytoplasm of the axon, the axoplasm, contains numerous neurofilaments, neurotubules, elongate profiles of smooth endoplasmic reticulum, and long, slender mitochondria. Since axoplasm does not contain Nissl substance, ...
... and may form a network or basket-like arrangement around postsynaptic neurons. The cytoplasm of the axon, the axoplasm, contains numerous neurofilaments, neurotubules, elongate profiles of smooth endoplasmic reticulum, and long, slender mitochondria. Since axoplasm does not contain Nissl substance, ...
Biology 218 – Human Anatomy - RIDDELL
... a. cell bodies range in diameter from 5 to 135 micrometers b. the pattern of dendritic branching is quite variable and distinctive for neurons in different regions of the nervous system c. a few small neurons lack an axon and many others have very short axons; long neurons have axons that may exceed ...
... a. cell bodies range in diameter from 5 to 135 micrometers b. the pattern of dendritic branching is quite variable and distinctive for neurons in different regions of the nervous system c. a few small neurons lack an axon and many others have very short axons; long neurons have axons that may exceed ...
CHAPTER 4
... – Contain six membrane-associated helices (S1-S6). – Six helices can be grouped into two domains: • Pore domain – permits the selective passage of K+ ions. • Voltage-sensing domain – consists of helices S1S4 that senses the voltage across the plasma membrane. ...
... – Contain six membrane-associated helices (S1-S6). – Six helices can be grouped into two domains: • Pore domain – permits the selective passage of K+ ions. • Voltage-sensing domain – consists of helices S1S4 that senses the voltage across the plasma membrane. ...
Unit 3-2 Nervous System Pt 2 Notes File
... •The CNS determines stimulus intensity by the frequency of impulse transmission (strength = number of action potentials) ...
... •The CNS determines stimulus intensity by the frequency of impulse transmission (strength = number of action potentials) ...
Mechanism of Action Overview Sodium channel blockers
... Action potentials are caused by an exchange of ions across the neuron membrane. A stimulus first causes sodium channels to open. Because there are many more sodium ions on the outside, and the inside of the neuron is negative relative to the outside, sodium ions rush into the neuron. Sodium has a po ...
... Action potentials are caused by an exchange of ions across the neuron membrane. A stimulus first causes sodium channels to open. Because there are many more sodium ions on the outside, and the inside of the neuron is negative relative to the outside, sodium ions rush into the neuron. Sodium has a po ...
Document
... cell that has most of the cytoplasm& nuclei -role in repair -most brain & spinal cord neurons lack this ...
... cell that has most of the cytoplasm& nuclei -role in repair -most brain & spinal cord neurons lack this ...
How to visually interpret biological data using networks
... Also, hierarchical structure in networks, such as in a pathway with subprocesses or a complex with subunits, is not easily represented. Alternative network representations that more faithfully represent biological systems have been proposed10–12 (http://www.biopax. org/), but no general and standard ...
... Also, hierarchical structure in networks, such as in a pathway with subprocesses or a complex with subunits, is not easily represented. Alternative network representations that more faithfully represent biological systems have been proposed10–12 (http://www.biopax. org/), but no general and standard ...
Nervous System Study Guide
... a. _______________________ the cell body receives information from this treebranch like projection that extends from a neuron. meningitis b. _______________________ Disorder that results in the inflammation of the layers axon of connective tissue that surrounds the brain. myelin sheath c. __________ ...
... a. _______________________ the cell body receives information from this treebranch like projection that extends from a neuron. meningitis b. _______________________ Disorder that results in the inflammation of the layers axon of connective tissue that surrounds the brain. myelin sheath c. __________ ...
Chapter 12 Lecture Outline
... – Sensory (afferent) division: carries signals from receptors to CNS • Somatic sensory division: carries signals from receptors in the skin, muscles, bones, and joints • Visceral sensory division: carries signals from the viscera (heart, lungs, stomach, and urinary bladder) ...
... – Sensory (afferent) division: carries signals from receptors to CNS • Somatic sensory division: carries signals from receptors in the skin, muscles, bones, and joints • Visceral sensory division: carries signals from the viscera (heart, lungs, stomach, and urinary bladder) ...
Answer Key Chapter 28 - Scarsdale Public Schools
... 12. List two types of chemical-gated ion channels that actually inhibit the initiation of an action potential in a target cell. Two types of ion channels that inhibit action potentials are channels that bring Cl− ions into the cell and channels that release K+ ions out of the cell. 13. Briefl ...
... 12. List two types of chemical-gated ion channels that actually inhibit the initiation of an action potential in a target cell. Two types of ion channels that inhibit action potentials are channels that bring Cl− ions into the cell and channels that release K+ ions out of the cell. 13. Briefl ...
How the Brain Works And Why it Probably Doesn`t Work this way!
... • The physician will look at the constellation of signs (what is found on examination) and symptoms (what the patient complains of) • The first step in the clinical evaluation is the anatomical diagnosis (Where is the lesion?; Single site [and specific location] or multiple sites [disseminated disor ...
... • The physician will look at the constellation of signs (what is found on examination) and symptoms (what the patient complains of) • The first step in the clinical evaluation is the anatomical diagnosis (Where is the lesion?; Single site [and specific location] or multiple sites [disseminated disor ...
Fact sheet (PDF, 63.03 KB) (opens in a new window)
... which traditionally have been some of the most challenging cases for surgeons. Nervous injury, from trauma, disease or otherwise, is a major medical problem. Mature neurons do not undergo cell division and therefore it is very difficult to achieve successful rehabilitation after nerve injuries. It i ...
... which traditionally have been some of the most challenging cases for surgeons. Nervous injury, from trauma, disease or otherwise, is a major medical problem. Mature neurons do not undergo cell division and therefore it is very difficult to achieve successful rehabilitation after nerve injuries. It i ...
Neurons
... Concept 48.2: Ion pumps and ion channels establish the resting potential of a neuron • Every cell has a voltage (difference in electrical charge) across its plasma membrane called a membrane potential • The resting potential is the membrane potential of a neuron not sending signals • Changes in mem ...
... Concept 48.2: Ion pumps and ion channels establish the resting potential of a neuron • Every cell has a voltage (difference in electrical charge) across its plasma membrane called a membrane potential • The resting potential is the membrane potential of a neuron not sending signals • Changes in mem ...
the neural impulse
... Neurons' specialized structures allow them to transmit messages throughout the nervous system. The sending of a message from one neuron to the next is called the neural impulse. Figure 2 is a series of simplified diagrams meant to familiarize you with the steps involved in the neural impulse. Refer ...
... Neurons' specialized structures allow them to transmit messages throughout the nervous system. The sending of a message from one neuron to the next is called the neural impulse. Figure 2 is a series of simplified diagrams meant to familiarize you with the steps involved in the neural impulse. Refer ...
neuron
... • Threshold: refers to the minimal level of stimulation required for a neural impulse to fire. ...
... • Threshold: refers to the minimal level of stimulation required for a neural impulse to fire. ...
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.