Spinal cord and Reflexes - Advance

Spinal cord and Reflexes - Advance

Dear Readers,

Spinal cord reflexes are simple behaviors produced by central nervous system (CNS) pathways that lie entirely within the spinal cord. The sensory afferent fibers that evoke these reflexes enter the spinal cord and activate spinal motor neurons directly or through a chain of one or more spinal interneurons.

Q1. If frog’s brain is crushed, even then it’s leg moves in pinpointing. It is called

•  Simple reflex
•  Conditional reflex
•  Neurotransmitter function
•  Autonomic nerve condition

Simple reflex

Q2. Conditioned reflexes are different than unconditioned reflexes in that

•  Conditioned reflexes are limited to brain
•  Unconditiond reflexes are limited to brain
•  Both (a) and (b)
•  None of the above

Conditioned reflexes are limited to brain

Q3. Which of the following is an example of conditioned reflex

•  Cycling
•  Withdrawal of hand on touching a hot plate
•  Watering of mouth at smell of food
•  Flowing of tears while cutting onions

Cycling

Q4. The cytons of reflex in central nervous system and autonomal nervous system is

•  Sensory
•  Mixed
•  Motor
•  All of these

Motor

Q5. Which is a wrong relation

•  Conditioned reflex – Hodgkins
•  Blood circulation – W. Harvey
•  DNA double helix model – Watson and Crick
•  None

Conditioned reflex – Hodgkins

Q6. One common example of simple reflex is

•  Tying your shoe laces while talking to another person and not looking at them
•  Watering of mouth at the sight of a favourite food
•  Climbing up a stairs in dark without stumbling
•  Closing of eyelids when an object suddenly approaches the eye

Closing of eyelids when an object suddenly approaches the eye

Q7. In reflex action the reflex arc is formed by

•  Brain – spibnal cord – muscles
•  Receptor – spinal cord – muscles
•  Muscles – receptor – brain
•  Muscles – spinal cord – muscles

Receptor – spinal cord – muscles

Q8. A boy learns typewriting and harmonium at the same time. He finds harmonium more easy to learn. This is

•  Conditioned reflex
•  Short term homeostasis
•  Long term homeostasis
•  Residual learning

Conditioned reflex

Q9. Anterior to enlargement of spinal cord is known as

•  Filum terminate
•  Conus terminate
•  Cervical swelling
•  Cauda equina

Cervical swelling

Q10. From which part of spinal cord, motor root originates

•  Ventral root
•  Dorsal root
•  Gray matter
•  White matter

Ventral root