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Anatomy and Physiology Nervous System > Nervous System by Claude Magno N1G > Flashcards

Nervous System by Claude Magno N1G Flashcards

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1
Q

what is the master controlling and communicating system of the body?

A

the nervous system

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2
Q

what are the functions of the nervous system?

A
  1. sensory input
  2. integration
  3. control of muscles and glands
  4. homeostasis
  5. center for mental activities
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3
Q

what are the divisions of the nervous system?

A

central nervous system (CNS) and peripheral nervous system (PNS)

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4
Q

what is the function of the CNS?

A

processes, integrates, stores, and responds to information from the PNS

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5
Q

what are the organs of CNS

A

brain and spinal cord

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6
Q

what is the function of the peripheral nervous system?

A
  1. detects stimuli and sends it to the CNS
  2. the PNS with receive and transmit the information to the affected area after the CNS processes the information
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7
Q

what are the organs/structures of the PNS?

A

nervous tissue outside of the CNS, sensory receptors, and nerves

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8
Q

what are the divisions of the peripheral nervous system?

A
  1. sensory division
  2. motor division
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9
Q

what is the function of the sensory division?

A

transmits action potentials from sensory receptors to the CNS

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10
Q

what is the function of the motor division?

A

carries action potentials away from CNS in cranial or spinal nerves

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11
Q

what are the 2 subdivisions of the motor division?

A

somatic nervous system and autonomic nervous system

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12
Q

what is the function of the somatic nervous system?

A

innervates skeletal muscles

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13
Q

what is the function of the autonomic nervous system?

A

innervates cardiac muscle, smooth muscle, and glands

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14
Q

does the autonomic nervous system have subdivisions?

A

yes, it has 3 subdivisions namely sympathetic, parasympathetic, and enteric

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15
Q

what is the sympathetic nervous system?

A

active during physical activity

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16
Q

what is the parasympathetic nervous system?

A

regulates resting functions

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17
Q

what is the enteric nervous system?

A

controls digestive system

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18
Q

what are neurons?

A

excitable cells that transmit electrical signals, receive stimuli, and transmit action potentials

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19
Q

what are the 3 components of neurons?

A

cell body (stroma), dendrites, axon

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20
Q

what is the cell body/soma?

A

contains the nucleus and a nucleolus, as well as the golgi apparatus, mitochondria, and other organelles

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21
Q

what are axons?

A

cytoplasmic extension of the cell body that transmits action potentials to other cells

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22
Q

what are dendrites?

A

short, branched cytoplasmic extensions of the cell body that usually conduct electrical signals toward the cell body

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23
Q

what are the different types of neurons?

A
  1. Multipolar Neurons (Motor) - have several dendrites and a single axon
  2. Bipolar Neurons - 1 axon and dendrite (components of sensory organs)
  3. Unipolar Neurons - have a single axon; most sensory neurons
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24
Q

what are Non-neural Cells (Glial Cells)?

A

provide a supportive scaffolding for neurons and also segregate and insulate them

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25
what are Astrocytes?
- most abundant, versatile highly branched - clings to neurons and their synaptic endings - cover capillaries - support and brace neurons and blood vessels (anchor neurons to their nutrient supplies) - influence the functioning of the blood-brain barrier
26
what are Ependymal Cells?
cells that line the ventricles of the brain and the central canal of the spinal cord and produce cerebrospinal fluid (CSF)
27
what is Oligodendrocytes?
they form myelin sheaths around the axons of several CNS neurons
28
what are Schwann cells?
cells that form myelin sheaths around the part of the axon of the PNS neuron
29
what is a Myelinated axon?
an axon with a myelin sheath (whitish, fatty (protein-lipid), segmented sheath around most long axons) produced by oligodendrocytes or schwann cells
30
what is the function of a myelin sheath?
it increases the speed of nerve impulse transmission and protects the axon
31
what is the rode of ranvier?
it is the gaps in the myelin sheath
32
what is the difference of the white matter from gray matter?
white matter consists of myelinated axons that propagate action potentials and forms nerve tracts in the CNS and nerves in the PNS gray matter is collections of neuron cell bodies or unmyelinated axons that forms cortex and nuclei in the CNS and ganglia in the PNS
33
what is the Concentration Differences Across the Plasma Membrane
Na+, Ca^2+, and Cl- ions are greater outside the cell than inside while K+ ions and negatively charged molecules are greater inside
34
what is Resting Membrane Potential (RMP)?
the charge difference across the plasma membrane when the cell is not being stimulated (the inside of the cell is negatively charged compared with the outside cell)
35
what is Depolarization?
decrease in K+ concentration gradient and increase in Na+ and Ca^2+ membrane permeability making the charge of the inside of the cell more positive
36
what is Hyperpolarization?
increase in K+ concentration gradient and decrease in Na+ and Ca^2+ membrane permeability making the charge of the inside of the cell more negative
37
what are the phases of action potentials?
1. Depolarization Phase 2. Repolarization Phase 3. Afterpotential
38
what is Absolute Refractory Period?
time during an action potential when a stimulus cannot initiate another action potential
39
what is Relative Refractory Period?
time during which a stimulus is stronger than threshold can evoke another action potential
40
what is Action Potential Frequency?
it is the number of action potentials produced per unit time in response to stimuli
41
what are Synapses?
junction between 2 cells where communication takes place
42
what is a Presynaptic Cell?
it transmits signal towards a synapse
43
what is a Postsynaptic Cell?
it receives the signal after it crossed a synapse
44
what are the Types of Synapses?
1. Electrical Synapse 2. Chemical Synapse
45
what is an Electrical Synapse?
gap junctions in which tubular proteins called connexons allow ionic currents to move between cells and is common in cardiac muscles and other muscles with coordinated contractions
46
what is a Chemical Synapse?
type of synapse which uses neurotransmitters released in the synaptic cleft to convert signal from presynaptic neuron to postsynaptic neuron
47
what are the components of a chemical synapse?
1. presynaptic terminals 2.postsynaptic terminals 3. synaptic cleft
48
what is a presynaptic inhibition?
decreases neurotransmitter release
49
what is Presynaptic Facilitation?
increases neurotransmitter release
50
what is Excitatory Postsynaptic Potential (EPSP)?
depolarizing graded potential of the postsynaptic membrane
51
what is Inhibitory Postsynaptic Potential?
hyperpolarizing graded potential of the postsynaptic membrane
52
what is Spatial Summation?
occurs when 2 or more presynaptic terminals simultaneously stimulate a postsynaptic neuron
53
what is Temporal Summation?
occurs when 2 or more action potentials arrive in succession at a single presynaptic terminal
54
what is Convergent Pathways?
many neurons synapsing with few neurons and have collateral branches of postsynaptic neurons synapsing with presynaptic neurons
55
what is Divergent Pathways?
few neurons synapsing with many neurons
56
what is a Junction?
junction between two cells where communication takes place
57
what is the difference between somatic and autonomic nervous system?
somatic: controlled consciously; axons extend to skeletal muscles and have and excitatory effects autonomic: controlled unconsciously; found in smooth muscle, cardiac muscles, and glands
58
what is Sympathetic division?
it controls body's "fight or flight" response; preganglionic cells bodies are in lateral horns of the spinal cord gray matter from T1 to L2 and pass through ventral roots to white rami communicates to sympathetic chain ganglia
59
what is Parasympathetic division?
controls the body's response to rest; preganglionic cell bodies are in nuclei in brainstem or lateral parts of spinal cord gray matter from S2 to S4 and pass to the ganglia through cranial nerves
60
what is the Enteric Nervous System?
consists of nerve plexuses in the wall of the digestive tract
61
what is the Neurotransmitters of the ANS?
1. Acetylcholine 2. Norepinephrine (epinephrine)
62
what releases Acetylcholine?
1. cholinergic neurons 2. all preganglionic neurons 3. all parasympathetic postganglionic 4. some sympathetic postganglionic
63
what released Norepinephrine?
1. adrenergic neurons 2. most sympathetic postganglionic neurons
64
what does Norepinephrine bind to?
Alpha and beta receptors found in most sympathetic effector organs
65
what does Acetylcholine bind to?
Nicotinic receptor (found in all postganglionic neurons excitatory) and Muscarinic receptors (found in all parasympathetic effector organs)
66
what can Autonomic reflex activity be influenced by?
hypothalamus and higher brain center
67
what can Sympathetic and parasympathetic division influence?
activities of the enteric nervous system through autonomic reflexes
68
Does the Enteric nervous system function independently or dependently?
Enteric nervous system can function independently of the CNS through local reflexes

Anatomy and Physiology Nervous System (1 decks)

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