Nervous system 2

 

1. What is it called when travelers suffer from disturbed sleep and activity patterns after crossing one world time zone to another?

Jet lag

2. Name one excitatory amino acid that is a neurotransmitter in the nervous system.

Glutamate / Aspartate

3. What type of summation occurs when two excitatory inputs arrive at a post synaptic neuron simultaneously?

Spatial summation

4. What is the process of disintegration of Nissl’s granules in the cell body after a nerve section?

Chromatolysis

5. Which enzyme catalyzes the conversion of nor-epinephrine to epinephrine?

Phenylethanolamine-N methyl transferase (PNMT)

6. Name the neurotransmitter that is released in the ganglia of the autonomic nervous system.

Acetylcholine

7. Name one inhibitory amino acid which acts as a neurotransmitter.

GABA / Glycine

8. What is the interval of synaptic delay before a response is obtained in a postsynaptic neuron?

0.5 ms

9. Where is the feeding centre situated in the humans?

Lateral hypothalamus

10. Where is the satiety centre in the humans situated?

Ventromedial hypothalamus

11. What will bilateral lesion of the ventro medial hypothalamus lead to?

Hypothalamic obesity

12. What type of receptors do the enkephalins / endorphins bind to?

Opioid receptors

13. No matter where a particular sensory pathway is stimulated along its course to the cortex, the conscious sensation produced is referred to the location of the receptor. What is this ‘principle’ called?

Law of Projection

14. The magnitude of sensation felt is proportionate to the log of the intensity of the stimulus. What is this principle?

Weber-Fechner law

15. Name the law that states the relationship between the intensiy of stimulus and magnitude of generator potential generated?

Weber-Fechner law

16. What is the area from which a stimulus produces a response?

Receptive feld

17. In the spinal cord the dorsal roots are sensory and the ventral roots are motor. What is this principle?

The Bell-Magendie law

18. When a skeletal muscle with an intact nerve supply is stretched, it contracts. What is this response called?

Stretch reflex

19. What is an example of a monsynaptic reflex?

Stretch reflex / knee jerk / deep tendon reflexes

20. How many synapses are involved in a stretch reflex?

Only one (Monosynaptic reflex)

 ( UMS, 2008 )