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BIOH111 > Nervous System 2 > Flashcards

Nervous System 2 Flashcards

1
Q

Name 5 tactile receptors located in the skin and hypodermis.

A
  1. Free nerve ending
  2. Type I cutaneous mechanoreceptor (tactile disc)
  3. Corpuscle of touch (meissner corpuscle)
  4. Type II cutaneous mechanoreceptor (ruffini corpuscle)
  5. Lamellated corpuscle (Pacinian)
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2
Q

List one sensation mediated by FREE NERVE ENDINGS

A

pain

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3
Q

List one sensation mediated by TYPE I CUTANEOUS MECHANORECEPTOR

A

touch

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4
Q

List one sensation mediated by CORPUSCLE OF TOUCH (Meissner)

A

fine touch

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5
Q

List one sensation mediated by TYPE II CUTANEOUS MECHANORECEPTOR

A

crude touch

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6
Q

List one sensation mediated by LAMELLATED CORPUSCLE (Pacinian)

A

pressure

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7
Q

What is the adaption rate of FREE NERVE ENDINGS

A

rapid and slow

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8
Q

What is the adaption rate of TYPE I CUTANEOUS MECHANORECEPTOR

A

slowly adapting

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9
Q

What is the adaption rate of CORPUSCLE OF TOUCH (Meissner)

A

rapidly adapting

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10
Q

What is the adaption rate of TYPE II CUTANEOUS MECHANORECEPTOR

A

slowly adapting

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11
Q

What is the adaption rate of LAMELLATED CORPUSCLE (Pacinian)

A

rapidly adapting

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12
Q

Name the 5 components of the somatic reflex arc involved in a stretch OR tendon reflex arc.

A 
Stretch Reflex
• Sensory receptor
• Sensory Neuron
• Integrating centre
• Motor neuron
• Effector
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13
Q

Describe the events that occur at the STRETCH REFLEX - SENSORY RECEPTOR

A

slight stretching of muscle stimulates sensory receptors (muscle spindle)

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14
Q

Describe the events that occur at the STRETCH REFLEX - SENSORY NEURON

A

slight stretching of muscle stimulates sensory receptors (muscle spindle)

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15
Q

Describe the events that occur at the STRETCH REFLEX - INTEGRATING CENTRE

A

within integrating centre neuron makes excitatory synapse with motor neuron in anterior grey horn

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16
Q

Describe the events that occur at the STRETCH REFLEX - MOTOR NEURON

A

nerve impulses arise in motor neuron, travel along axon to anterior root of spinal nerve to neuromuscular junction of stretched muscle

17
Q

Describe the events that occur at the STRETCH REFLEX - EFFECTOR

A

muscle action potential in stretched muscle causes muscle to contract which relieves stretch

18
Q

Name the 5 components of the AUTONOMIC REFLEX ARC

A
  • Sensory receptor
  • Sensory neuron
  • Integrating centre
  • Pre and postganglionic neurons
  • Visceral effectors
19
Q 
Describe the events that occur at each componont of the AUTONOMIC REFLEX ARC
• sensory receptor
• Sensory neuron
• Integrating centre
• Pre and postganglionic neurons
• Visceral effectors
A
  • Sensory receptor – receives stimulus
  • Sensory neuron – sends impulse to IC
  • Integrating centre – in spinal cord sends impulse to peripheral ganglion
  • Pre and postganglionic neurons – sends impulse to VE
  • Visceral effectors respond
20
Q

Postganglionic neurons define the subdivision of the autonomic nervous system and can be 2 different types – adrenergic and cholinergic. Name the neurotransmitters that are released by each of the neuronal types.

A
  • Norepinephrine (a)

* Acetylcholine (c)

21
Q

List the two types of CHOLINERGIC receptors

A
  • nicotinic

* muscarinic

22
Q

Describe the NICOTINIC receptor

A

ionotropic receptor

23
Q

Describe the MUSCARINIC receptor

A

metabotrophic

24
Q

Describe the location for NICOTINIC receptors

A
  • in plasma membrane of postganglionic sympathetic and parasympathetic neurons
  • and motor end plate
25
Q

Describe the location for MUSCARINIC receptors

A
  • in effectors enervated by parasympathetic postganglionic neurons
26
Q

State whether activation leads to excitation &/or inhibition for NICOTINIC receptors

A

excitation

27
Q

State whether activation leads to excitation &/or inhibition for MUSCARINIC receptors

A

excitation or inhibition

BIOH111 (8 decks)

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