The Nervous System
... ensues, depolarizing the cell and causing the VM to increase. This is the rising phase of an AP. • Eventually, the Na+ channel will have inactivated and the K+ channels will be open. Now, K+ effluxes and repolarization occurs. This is the falling phase. – K+ channels are slow to open and slow to clo ...
... ensues, depolarizing the cell and causing the VM to increase. This is the rising phase of an AP. • Eventually, the Na+ channel will have inactivated and the K+ channels will be open. Now, K+ effluxes and repolarization occurs. This is the falling phase. – K+ channels are slow to open and slow to clo ...
Motor systems
... 1. Spinal reflexes are initiated by sensory stimuli that activate the receptors in muscles, joints, and skin. These stimuli activate the neuronal network in the spinal cord. This network affects a specific group of muscles. 2. Spinal reflex networks perform three main functions: (1) control of indiv ...
... 1. Spinal reflexes are initiated by sensory stimuli that activate the receptors in muscles, joints, and skin. These stimuli activate the neuronal network in the spinal cord. This network affects a specific group of muscles. 2. Spinal reflex networks perform three main functions: (1) control of indiv ...
The Nervous System - School District of New Berlin
... • The result- the interior of the cell is negatively charged with respect to the exteriorpolarization ...
... • The result- the interior of the cell is negatively charged with respect to the exteriorpolarization ...
Document
... __A__3. Which of the following is true about a motor neuron? a. Dendrites carry information toward the cell body. b. Dendrites carry information away from the cell body. c. Axons carry information toward the cell body. d. None of the above __C__4. Neurons that have repolarized will have a high conce ...
... __A__3. Which of the following is true about a motor neuron? a. Dendrites carry information toward the cell body. b. Dendrites carry information away from the cell body. c. Axons carry information toward the cell body. d. None of the above __C__4. Neurons that have repolarized will have a high conce ...
On-line supplemental data: Case Histories
... cognitive abnormalities. Although he was described as having a “short fuse” throughout most of his adult life, verbal arguments or fist fights were infrequent. He did not have any significant impulse control problems but was intermittently mildly depressed. His past medical history was significant f ...
... cognitive abnormalities. Although he was described as having a “short fuse” throughout most of his adult life, verbal arguments or fist fights were infrequent. He did not have any significant impulse control problems but was intermittently mildly depressed. His past medical history was significant f ...
Nervous System:
... Ion pumps in the cell membranes of neurons release three positively charged sodium ions, while taking in only two positively charged potassium ions which creates a negative charge inside the cell. The space inside the neuron now has a resting potential, which is a kind of membrane potential, because ...
... Ion pumps in the cell membranes of neurons release three positively charged sodium ions, while taking in only two positively charged potassium ions which creates a negative charge inside the cell. The space inside the neuron now has a resting potential, which is a kind of membrane potential, because ...
Neuromuscular Adaptations to Resistance Training
... Left ventricular concentric hypertrophy resulting from resistive training can be accompanied by strengthened myocardium and increased stroke volume at rest and during exercise. Stroke volume is not significantly increased when it is related to body surface area or lean body mass. ...
... Left ventricular concentric hypertrophy resulting from resistive training can be accompanied by strengthened myocardium and increased stroke volume at rest and during exercise. Stroke volume is not significantly increased when it is related to body surface area or lean body mass. ...
BIOLOGICAL BASES OF BEHAVIOR
... • The neuron’s resting potential is -70mV (inside the axon). When sufficiently stimulated outside the cell of about +10mV a net flow of sodium ions into the cell causes a change known as the action potential. • If stimulation is not strong enough, the neuron does not fire. • The strength of the act ...
... • The neuron’s resting potential is -70mV (inside the axon). When sufficiently stimulated outside the cell of about +10mV a net flow of sodium ions into the cell causes a change known as the action potential. • If stimulation is not strong enough, the neuron does not fire. • The strength of the act ...
Cells of the Nervous System
... Physiological Properties of the Synapse 3. Inhibition (or inhibitory postsynaptic potential (IPSP)) Inhibition is the opposite of facilitation. The threshold of a postsynaptic neuron is increased. When an inhibitory presynaptic neuron synapses with a postsynaptic neuron that causes hyperpolarizatio ...
... Physiological Properties of the Synapse 3. Inhibition (or inhibitory postsynaptic potential (IPSP)) Inhibition is the opposite of facilitation. The threshold of a postsynaptic neuron is increased. When an inhibitory presynaptic neuron synapses with a postsynaptic neuron that causes hyperpolarizatio ...
key points - Dr. Tomas Madayag
... 2. If pain sensation is not carried by tertiary neurons, we do not perceive them 3. The lateral spinothalamic tracts conducts sensory impulses for pain and temperature from various levels of the spinal cord to the thalamus 4. The medial lemniscus is a tract of nerve fibers that conveys sensory signa ...
... 2. If pain sensation is not carried by tertiary neurons, we do not perceive them 3. The lateral spinothalamic tracts conducts sensory impulses for pain and temperature from various levels of the spinal cord to the thalamus 4. The medial lemniscus is a tract of nerve fibers that conveys sensory signa ...
nervous system ppt
... 7. The resulting action potential causes a local bioelectric current that stimulates adjacent* portions of the membrane. 8. Wave of action potentials travel the length of the axon as a nerve impulse * What does the word “adjacent” mean? ...
... 7. The resulting action potential causes a local bioelectric current that stimulates adjacent* portions of the membrane. 8. Wave of action potentials travel the length of the axon as a nerve impulse * What does the word “adjacent” mean? ...
12. Peripheral Nervous System
... Slide HISTO007: Skeletal Muscle – nerve and motor end plate o Single nerve innervation of several muscle fibers ...
... Slide HISTO007: Skeletal Muscle – nerve and motor end plate o Single nerve innervation of several muscle fibers ...
BehNeuro11#2 (2) - Biology Courses Server
... c) You now record from 3 neurons in motor cortex that have similar ‘best directions of arm movement’. Using your understanding of the motor organization of the superior colliculus, speculate as to why the ‘response’ vectors shown below differ in length (the length of vectors represents the firing ra ...
... c) You now record from 3 neurons in motor cortex that have similar ‘best directions of arm movement’. Using your understanding of the motor organization of the superior colliculus, speculate as to why the ‘response’ vectors shown below differ in length (the length of vectors represents the firing ra ...
Your Name Here______________________________
... 15. Dopamine, histamine, norepinephrine and serotonin are in the class of neurotransmitters called a. neuropeptides b. amino acids c. neuromodulators d. monoamines 16. Immune protection of the CNS is in part based on the activity of a. astrocytes b. oligodendrocytes c. ependymal cells d. microglia ...
... 15. Dopamine, histamine, norepinephrine and serotonin are in the class of neurotransmitters called a. neuropeptides b. amino acids c. neuromodulators d. monoamines 16. Immune protection of the CNS is in part based on the activity of a. astrocytes b. oligodendrocytes c. ependymal cells d. microglia ...
Membrane potential
... • Movement of K+ out of cell repolarizes the cell • The inside of the cell once again becomes more negative than the ...
... • Movement of K+ out of cell repolarizes the cell • The inside of the cell once again becomes more negative than the ...
Unit Test Neuro: Core ( Topic 6.5) and Options E ( Topics 1,2,4) HL
... 6.5.1 State that the nervous system consists of the central nervous system (CNS) and peripheral nerves and is composed of cells called neurons that can carry rapid electrical impulses. (1) ...
... 6.5.1 State that the nervous system consists of the central nervous system (CNS) and peripheral nerves and is composed of cells called neurons that can carry rapid electrical impulses. (1) ...
Introduction to the Nervous System
... c- C1 exits between the atlas vertebrae and the occipital bone of the skull, all others exit directly from the vertebral column 3- Ganglia – ...
... c- C1 exits between the atlas vertebrae and the occipital bone of the skull, all others exit directly from the vertebral column 3- Ganglia – ...
Neuromuscular junction
A neuromuscular junction (sometimes called a myoneural junction) is a junction between nerve and muscle; it is a chemical synapse formed by the contact between the presynaptic terminal of a motor neuron and the postsynaptic membrane of a muscle fiber. It is at the neuromuscular junction that a motor neuron is able to transmit a signal to the muscle fiber, causing muscle contraction.Muscles require innervation to function—and even just to maintain muscle tone, avoiding atrophy. Synaptic transmission at the neuromuscular junction begins when an action potential reaches the presynaptic terminal of a motor neuron, which activates voltage-dependent calcium channels to allow calcium ions to enter the neuron. Calcium ions bind to sensor proteins (synaptotagmin) on synaptic vesicles, triggering vesicle fusion with the cell membrane and subsequent neurotransmitter release from the motor neuron into the synaptic cleft. In vertebrates, motor neurons release acetylcholine (ACh), a small molecule neurotransmitter, which diffuses across the synaptic cleft and binds to nicotinic acetylcholine receptors (nAChRs) on the cell membrane of the muscle fiber, also known as the sarcolemma. nAChRs are ionotropic receptors, meaning they serve as ligand-gated ion channels. The binding of ACh to the receptor can depolarize the muscle fiber, causing a cascade that eventually results in muscle contraction.Neuromuscular junction diseases can be of genetic and autoimmune origin. Genetic disorders, such as Duchenne muscular dystrophy, can arise from mutated structural proteins that comprise the neuromuscular junction, whereas autoimmune diseases, such as myasthenia gravis, occur when antibodies are produced against nicotinic acetylcholine receptors on the sarcolemma.