Nervous System 2

Question 1

Name 5 tactile receptors located in the skin and hypodermis.

Answer 1

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)

Question 2

List one sensation mediated by FREE NERVE ENDINGS

Answer 2

pain

Question 3

List one sensation mediated by TYPE I CUTANEOUS MECHANORECEPTOR

Answer 3

touch

Question 4

List one sensation mediated by CORPUSCLE OF TOUCH (Meissner)

Answer 4

fine touch

Question 5

List one sensation mediated by TYPE II CUTANEOUS MECHANORECEPTOR

Answer 5

crude touch

Question 6

List one sensation mediated by LAMELLATED CORPUSCLE (Pacinian)

Answer 6

pressure

Question 7

What is the adaption rate of FREE NERVE ENDINGS

Answer 7

rapid and slow

Question 8

What is the adaption rate of TYPE I CUTANEOUS MECHANORECEPTOR

Answer 8

slowly adapting

Question 9

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

Answer 9

rapidly adapting

Question 10

What is the adaption rate of TYPE II CUTANEOUS MECHANORECEPTOR

Answer 10

slowly adapting

Question 11

What is the adaption rate of LAMELLATED CORPUSCLE (Pacinian)

Answer 11

rapidly adapting

Question 12

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

Answer 12

Stretch Reflex
• Sensory receptor
• Sensory Neuron
• Integrating centre
• Motor neuron
• Effector

Question 13

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

Answer 13

slight stretching of muscle stimulates sensory receptors (muscle spindle)

Question 14

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

Answer 14

slight stretching of muscle stimulates sensory receptors (muscle spindle)

Question 15

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

Answer 15

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

Question 16

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

Answer 16

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

Question 17

Describe the events that occur at the STRETCH REFLEX - EFFECTOR

Answer 17

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

Question 18

Name the 5 components of the AUTONOMIC REFLEX ARC

Answer 18

• Sensory receptor
• Sensory neuron
• Integrating centre
• Pre and postganglionic neurons
• Visceral effectors

Question 19

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

Answer 19

• 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

Question 20

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.

Answer 20

• Norepinephrine (a)

* Acetylcholine (c)

Question 21

List the two types of CHOLINERGIC receptors

Answer 21

• nicotinic

* muscarinic

Question 22

Describe the NICOTINIC receptor

Answer 22

ionotropic receptor

Question 23

Describe the MUSCARINIC receptor

Answer 23

metabotrophic

Question 24

Describe the location for NICOTINIC receptors

Answer 24

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

Question 25

Describe the location for MUSCARINIC receptors

Answer 25

* in effectors enervated by parasympathetic postganglionic neurons

Question 26

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

Answer 26

excitation

Question 27

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

Answer 27

excitation or inhibition