sympathetic and parasympathetic systems
... - an action potential can only be initiated at the dendrite end of a nerve fiber (receptor or synapse) Thus the impulse can only travel away from the receptor towards the cell body. It never goes in the opposite direction (although it can be made to do so artificially) ALL OR NONE - action potential ...
... - an action potential can only be initiated at the dendrite end of a nerve fiber (receptor or synapse) Thus the impulse can only travel away from the receptor towards the cell body. It never goes in the opposite direction (although it can be made to do so artificially) ALL OR NONE - action potential ...
4Central Nervous System (CNS)
... modulates mood, and plays a central role in positive reinforcement and dependency ...
... modulates mood, and plays a central role in positive reinforcement and dependency ...
The Nervous System
... membranes of other cells. If a dendrite is stimulated, it sends its message to the cell body and the message is passed on If a muscle or gland is stimulated, a reaction occurs in that organ. ...
... membranes of other cells. If a dendrite is stimulated, it sends its message to the cell body and the message is passed on If a muscle or gland is stimulated, a reaction occurs in that organ. ...
Review
... -White matter in the cerebrum consists of 3 types of neural tracts. What areas do they allow to communicate? -Gray matter is found in 3 places of the cerebrum. Which place has the most gray matter? Basal nuclei: where is it located? Involved in motor control. Limbic system: involved in emotion and l ...
... -White matter in the cerebrum consists of 3 types of neural tracts. What areas do they allow to communicate? -Gray matter is found in 3 places of the cerebrum. Which place has the most gray matter? Basal nuclei: where is it located? Involved in motor control. Limbic system: involved in emotion and l ...
Study Guide
... Study Guide Biol 2121 Test #5 The following study guide is exactly that, a guide. Use it to direct your studies for the first exam. The text should be used to clarify any questions you have. You are still responsible for all class notes covered or not covered in my lectures. Good luck to you all. CH ...
... Study Guide Biol 2121 Test #5 The following study guide is exactly that, a guide. Use it to direct your studies for the first exam. The text should be used to clarify any questions you have. You are still responsible for all class notes covered or not covered in my lectures. Good luck to you all. CH ...
D22 - Viktor`s Notes for the Neurosurgery Resident
... F response (so named because it was first observed in small foot muscles): electrical nerve stimulation (motor fibers must be excited) → antidromic (retrograde) activation of motoneuron soma → orthograde conduction back to periphery → potential evoked from muscle (F response). stimulator is rotate ...
... F response (so named because it was first observed in small foot muscles): electrical nerve stimulation (motor fibers must be excited) → antidromic (retrograde) activation of motoneuron soma → orthograde conduction back to periphery → potential evoked from muscle (F response). stimulator is rotate ...
nervous5
... If 4 inhibitory synapses are active at the same time, how many excitatory synapses must be active simultaneously to exceed threshold (-55 mV) if the resting membrane potential is -70mV? ...
... If 4 inhibitory synapses are active at the same time, how many excitatory synapses must be active simultaneously to exceed threshold (-55 mV) if the resting membrane potential is -70mV? ...
Introduction to Anatomy
... The three essential functions of the nervous system are: 1. sense changes 2. integrate and interpret 3. respond How do the various components of the nervous system cooperate in performing these functions? ...
... The three essential functions of the nervous system are: 1. sense changes 2. integrate and interpret 3. respond How do the various components of the nervous system cooperate in performing these functions? ...
LectureTest22011, the new questions
... A. The sensory information carried by the spinothalamic and dorsal column pathways comes to our consciousness, but sensory information carried by the spinocerebellar pathway does not. B. In the dorsal column patahway, the axons of the first neurons are in the white matter of the cerebrum. C. In the ...
... A. The sensory information carried by the spinothalamic and dorsal column pathways comes to our consciousness, but sensory information carried by the spinocerebellar pathway does not. B. In the dorsal column patahway, the axons of the first neurons are in the white matter of the cerebrum. C. In the ...
Action Potentials & Nerve Conduction
... movement of the activation gate, but its response time is slower. • When the activation gate is open, the signal passes along the channel protein to the inactivation gate. ...
... movement of the activation gate, but its response time is slower. • When the activation gate is open, the signal passes along the channel protein to the inactivation gate. ...
Electrodiagnosis
... rheobase. The rheobase is doubled to reduce the subjective testing. The chronaxie test measures the duration of the stimulation necessary to produce a minimal contraction at specific intensities of current. So, it is primarily a measure of time not intensity. Normal muscles respond to short-duration ...
... rheobase. The rheobase is doubled to reduce the subjective testing. The chronaxie test measures the duration of the stimulation necessary to produce a minimal contraction at specific intensities of current. So, it is primarily a measure of time not intensity. Normal muscles respond to short-duration ...
Study Guide Chapter 10 in Fox
... Most sensory receptors are either ______________ or _______________ These receptors receive some form of ___________ and convert it into action potentials. Because they convert energy from one form to another, receptors are called ____________ Different forms of sensations are often called__________ ...
... Most sensory receptors are either ______________ or _______________ These receptors receive some form of ___________ and convert it into action potentials. Because they convert energy from one form to another, receptors are called ____________ Different forms of sensations are often called__________ ...
Test Questions (Chapter13)
... 23. Hanna's mom had a stroke about a month ago. Her mom is telling Hanna that she cannot feel half of her face. Which disorder does Hanna's mom have? 24. The well documented horse riding accident of Christopher Reeve resulted in a spinal cord injury above C3 and he had to use a mechanical ventilato ...
... 23. Hanna's mom had a stroke about a month ago. Her mom is telling Hanna that she cannot feel half of her face. Which disorder does Hanna's mom have? 24. The well documented horse riding accident of Christopher Reeve resulted in a spinal cord injury above C3 and he had to use a mechanical ventilato ...
Central Nervous System (CNS)
... hemisphere in his brain that was causing constant seizures • His only hope of survival and brain development involved early surgery to sever the connections between the right and left hemispheres of the brain ...
... hemisphere in his brain that was causing constant seizures • His only hope of survival and brain development involved early surgery to sever the connections between the right and left hemispheres of the brain ...
Phylum Nematoda
... - Resists digestion by the host - Longitudinal muscles are used for locomotion ...
... - Resists digestion by the host - Longitudinal muscles are used for locomotion ...
Guided Notes for the Nervous System-
... 5.There are two subdivisions of the PNS. The sensory, or afferent, division consists of nerve fibers that convey impulses to the central nervous system from sensory receptors located in various parts of the body. The motor, or efferent, division carries impulses from the CNS to effector organs, the ...
... 5.There are two subdivisions of the PNS. The sensory, or afferent, division consists of nerve fibers that convey impulses to the central nervous system from sensory receptors located in various parts of the body. The motor, or efferent, division carries impulses from the CNS to effector organs, the ...
Lecture Cranial Nerves 1
... Gross Anatomy: Cranial Nerve Introduction (Grays, pages 807; 848-854) ...
... Gross Anatomy: Cranial Nerve Introduction (Grays, pages 807; 848-854) ...
Lecture 4:
... Motor neurons : Also named efferent neurons: Carry messages away from the CNS (brain and/or spinal cord). ...
... Motor neurons : Also named efferent neurons: Carry messages away from the CNS (brain and/or spinal cord). ...
3E-F Worksheet 1. Sensory receptors that are classed by location
... 10. The muscles of the eyebrows are the _____________muscle which __________eyebrows and the _______________ muscles which move the eyebrows____________. o\/o 3F3 11. In the sensory tunic of the retina the photoreceptors cells are made up of ______which respond to dim ________and are used for ______ ...
... 10. The muscles of the eyebrows are the _____________muscle which __________eyebrows and the _______________ muscles which move the eyebrows____________. o\/o 3F3 11. In the sensory tunic of the retina the photoreceptors cells are made up of ______which respond to dim ________and are used for ______ ...
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.