Nervous System
... Unipolar Neurons: These have a single process that extends from the cell body. the process divides into two branches. One to the CNS the other to the peripheral nervous system. Most sensory neurons are ...
... Unipolar Neurons: These have a single process that extends from the cell body. the process divides into two branches. One to the CNS the other to the peripheral nervous system. Most sensory neurons are ...
5 Action Potential.key
... • Very useful for electrophysiology • Enables the recording of single channels ...
... • Very useful for electrophysiology • Enables the recording of single channels ...
EXCITABLE TISSUES
... membrane. Some vesicles fuse with the neuronal surface membrane and burst releasing their neurotransmitter content into the cleft. The neurotransmitter in this case is Acetylcholine (ACh). The ACh diffuses rapidly across the narrow cleft and attaches to receptors on ...
... membrane. Some vesicles fuse with the neuronal surface membrane and burst releasing their neurotransmitter content into the cleft. The neurotransmitter in this case is Acetylcholine (ACh). The ACh diffuses rapidly across the narrow cleft and attaches to receptors on ...
13.2 part 2
... When axons are myelinated, nerve impulses travel by a process called saltatory conduction. In myelinated axons, the gated ion channels of K+ and Na+ are concentrated at the nodes of Ranvier between the Schwann cells. ...
... When axons are myelinated, nerve impulses travel by a process called saltatory conduction. In myelinated axons, the gated ion channels of K+ and Na+ are concentrated at the nodes of Ranvier between the Schwann cells. ...
Regulation of Breathing
... 3. Changes in pH must be as large 4. When the Central Chemoreceptors do not respond 5. CO2 retainer II. ...
... 3. Changes in pH must be as large 4. When the Central Chemoreceptors do not respond 5. CO2 retainer II. ...
Biological Bases of Behavior : Quiz 1
... consciousness in most people. c. The strength of the stimulus determines neural conduction speed. d. Different kinds of electrical activity are found in different sensory nerves. ...
... consciousness in most people. c. The strength of the stimulus determines neural conduction speed. d. Different kinds of electrical activity are found in different sensory nerves. ...
ANNB/Biology 261 Exam 1
... If your new neuron is similar to a “typical” neuron, you will find that the K+ current is more important for RMP and that the K+ current will be stronger impact on RMP than the Na+ current when you change the concentrations of each ion because the K+ channels are much more permeable than the Na+ cur ...
... If your new neuron is similar to a “typical” neuron, you will find that the K+ current is more important for RMP and that the K+ current will be stronger impact on RMP than the Na+ current when you change the concentrations of each ion because the K+ channels are much more permeable than the Na+ cur ...
Biology 12 Name: Nervous System Practice Exam Types of Neurons
... b) A neurotransmitter would be released. c) The length of the recovery phase would be reduced. d) The frequency of action potentials would be increased. 20. Why can an impulse traveling along an axon not reverse its direction? a) The myelin sheath will only permit one-way travel of an impulse. b) So ...
... b) A neurotransmitter would be released. c) The length of the recovery phase would be reduced. d) The frequency of action potentials would be increased. 20. Why can an impulse traveling along an axon not reverse its direction? a) The myelin sheath will only permit one-way travel of an impulse. b) So ...
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 ...
Reflex Arc - WordPress.com
... Reflexes are automatic - don’t have to think about them Message doesn’t have to go to brain for response to occur, sent directly to spinal cord Since there is no processing, reactions can be very quick ...
... Reflexes are automatic - don’t have to think about them Message doesn’t have to go to brain for response to occur, sent directly to spinal cord Since there is no processing, reactions can be very quick ...
Document
... Negative charge inside cell and active cell pumping pull in the positive charge As action potential decreases, more sodium channels open up allowing in more positive charge – positive feedback. Action potential changes from -70 mV to +40 mV. At +40 mV sodium channels close – negative feedback ...
... Negative charge inside cell and active cell pumping pull in the positive charge As action potential decreases, more sodium channels open up allowing in more positive charge – positive feedback. Action potential changes from -70 mV to +40 mV. At +40 mV sodium channels close – negative feedback ...
Nervous System - Phoenix Union High School District
... A) Somatic sensory afferent fibers – carry impulses from skin, skeletal muscles, and joints to the brain B) Visceral afferent fibers – transmit impulses from visceral organs to the brain ...
... A) Somatic sensory afferent fibers – carry impulses from skin, skeletal muscles, and joints to the brain B) Visceral afferent fibers – transmit impulses from visceral organs to the brain ...
by David Zimmerman The ultimate in nerve regeneration
... A crushed or severed axon's first response to the injury is to die back from the wound. This axonal degeneration ceases after a week or so. Then, in those neurons that are capable of it, the neuron appears to stabilize itself metabolically and the axon to regenerate, g r o w i n g past the injury si ...
... A crushed or severed axon's first response to the injury is to die back from the wound. This axonal degeneration ceases after a week or so. Then, in those neurons that are capable of it, the neuron appears to stabilize itself metabolically and the axon to regenerate, g r o w i n g past the injury si ...
Outline15 Spinal Cord
... 7. What type of information is carried by the dorsal (posterior) roots of spinal nerves? What type of information is carried by the ventral (anterior) roots of spinal nerves? 8. What effectors are innervated by somatic motor neurons? What effectors are innervated by autonomic motor neurons? 9. What ...
... 7. What type of information is carried by the dorsal (posterior) roots of spinal nerves? What type of information is carried by the ventral (anterior) roots of spinal nerves? 8. What effectors are innervated by somatic motor neurons? What effectors are innervated by autonomic motor neurons? 9. What ...
Developer Notes
... ions across the cell membrane. Without the action of the pumps the amounts of positive and negative ions inside and outside the cell would be equal; there would be no net charge. However, with the action of such a pump, along with diffusion, 3 positive sodium ions (Na+) go outside the cell while onl ...
... ions across the cell membrane. Without the action of the pumps the amounts of positive and negative ions inside and outside the cell would be equal; there would be no net charge. However, with the action of such a pump, along with diffusion, 3 positive sodium ions (Na+) go outside the cell while onl ...
Topic 8.1 Neurones and nervous responses File
... no myelin. Therefore local circuits can node and a form between one ___ neighbouring one and as a result the node action potential jumps from one ______ increases to another. This _________ the rate of conduction because action potentials do not have to be formed at every point along the axon. Salta ...
... no myelin. Therefore local circuits can node and a form between one ___ neighbouring one and as a result the node action potential jumps from one ______ increases to another. This _________ the rate of conduction because action potentials do not have to be formed at every point along the axon. Salta ...
Chapter Two Line Title Here and Chapter Title Here and Here
... b. Each neuron has a single axon that arises from the axon hillock and generates and conducts nerve impulses away from the cell body to the axon terminals. i. Axon terminals secrete neurotransmitters that either excite or inhibit other neurons or effector cells. ii. Axons may have a myelin sheath, a ...
... b. Each neuron has a single axon that arises from the axon hillock and generates and conducts nerve impulses away from the cell body to the axon terminals. i. Axon terminals secrete neurotransmitters that either excite or inhibit other neurons or effector cells. ii. Axons may have a myelin sheath, a ...
Chapter Two Line Title Here and Chapter Title Here and Here
... b. Each neuron has a single axon that arises from the axon hillock and generates and conducts nerve impulses away from the cell body to the axon terminals. i. Axon terminals secrete neurotransmitters that either excite or inhibit other neurons or effector cells. ii. Axons may have a myelin sheath, a ...
... b. Each neuron has a single axon that arises from the axon hillock and generates and conducts nerve impulses away from the cell body to the axon terminals. i. Axon terminals secrete neurotransmitters that either excite or inhibit other neurons or effector cells. ii. Axons may have a myelin sheath, a ...
Chapter 9 - Nervous System
... The hypothalamus maintains homeostasis by regulating a wide variety of visceral activities and by linking the endocrine system with the nervous system. a. The hypothalamus regulates heart rate and arterial blood pressure, body temperature, water and electrolyte balance, hunger and body weight, movem ...
... The hypothalamus maintains homeostasis by regulating a wide variety of visceral activities and by linking the endocrine system with the nervous system. a. The hypothalamus regulates heart rate and arterial blood pressure, body temperature, water and electrolyte balance, hunger and body weight, movem ...
PNS - Wsimg.com
... Adrenergic Receptors Receptors that bind to norepinephrin & epinephrine In cells innervated by SANS postganglionic axons ...
... Adrenergic Receptors Receptors that bind to norepinephrin & epinephrine In cells innervated by SANS postganglionic axons ...
Nervous 1 Green
... -At rest, the neuron is polarized with a negative charge (2) -Active transport will cause the electronic imbalance to become larger and gated channels will open (2) -The neuron then becomes depolarized (more positive) (2) -Pumps and potassium channels (which open) rebalance polarization (2) ...
... -At rest, the neuron is polarized with a negative charge (2) -Active transport will cause the electronic imbalance to become larger and gated channels will open (2) -The neuron then becomes depolarized (more positive) (2) -Pumps and potassium channels (which open) rebalance polarization (2) ...
Nerves and nervous impulses File
... no myelin. Therefore local circuits can node and a form between one ___ neighbouring one and as a result the node action potential jumps from one ______ increases to another. This _________ the rate of conduction because action potentials do not have to be formed at every point along the axon. Salta ...
... no myelin. Therefore local circuits can node and a form between one ___ neighbouring one and as a result the node action potential jumps from one ______ increases to another. This _________ the rate of conduction because action potentials do not have to be formed at every point along the axon. Salta ...
Chapter 10 - Nervous System I
... A nerve impulse is conducted as action potential is reached at the trigger zone and spreads by a local current flowing down the fiber, and adjacent areas of the membrane reach action potential. B. Impulse Conduction (p. 223) ...
... A nerve impulse is conducted as action potential is reached at the trigger zone and spreads by a local current flowing down the fiber, and adjacent areas of the membrane reach action potential. B. Impulse Conduction (p. 223) ...
Rheobase
Rheobase is a measure of membrane excitability. In neuroscience, rheobase is the minimal current amplitude of infinite duration (in a practical sense, about 300 milliseconds) that results in the depolarization threshold of the cell membranes being reached, such as an action potential or the contraction of a muscle. In Greek, the root ""rhe"" translates to current or flow, and ""basi"" means bottom or foundation: thus the rheobase is the minimum current that will produce an action potential or muscle contraction.Rheobase can be best understood in the context of the strength-duration relationship (Fig. 1). The ease with which a membrane can be stimulated depends on two variables: the strength of the stimulus, and the duration for which the stimulus is applied. These variables are inversely related: as the strength of the applied current increases, the time required to stimulate the membrane decreases (and vice versa) to maintain a constant effect. Mathematically, rheobase is equivalent to half the current that needs to be applied for the duration of chronaxie, which is a strength-duration time constant that corresponds to the duration of time that elicits a response when the nerve is stimulated at twice rheobasic strength.The strength-duration curve was first discovered by G. Weiss in 1901, but it was not until 1909 that Louis Lapicque coined the term ""rheobase"". Many studies are being conducted in relation to rheobase values and the dynamic changes throughout maturation and between different nerve fibers. In the past strength-duration curves and rheobase determinations were used to assess nerve injury; today, they play a role in clinical identification of many neurological pathologies, including as Diabetic neuropathy, CIDP, Machado-Joseph Disease, and ALS.