Advertisements
Advertisements
Question
What is spinal cord? What is its main function?
Advertisements
Solution
The spinal cord is a part of the central nervous system. It is a cylindrical structure enclosed by a bony cage called the vertebral column. It is responsible for spinal reflex actions and the conduction of nerve impulses to and from the brain.
APPEARS IN
RELATED QUESTIONS
How do we detect the smell of an agarbatti (incense stick)?
Give three examples of reflex actions.
Fill in the following blank with suitable word :
A neuron which carries an impulse to the brain is called a ........... neuron.
Write the names of the regions in hindbrain. Give one function of each region.
Explain the difference between of the following pair of terms :
cerebrum and cerebellum
When you smell a favourite food your mouth begins to water (that is, you secrete saliva). Write down what is the example of the cells in your nasal passages which perceive the smell?
The part of brain which controls the involuntary action such as heart beat, breathing, blood pressure, etc. is :
(a) pons
(b) medulla
(c) cerebrum
(d) cerebellum
The part of brain which takes part in regulating respiration in the human body is :
(a) medulla
(b) pons
(c) cerebellum
(d) cerebrum
Which of the following statements are true?
(i) sudden action in response to something in the environment is called reflex action
(ii) sensory neurons carry electrical signals from spinal cord to muscles in a reflex action
(iii) motor neurons carry signals from receptors to spinal cord in a reflex action
(iv) the pathway of transmitting signals from a receptor to a muscle is a reflex action
A cylindrical structure P in our body begins in continuation with medulla and extends downwards. It is enclosed in a bony cage Q and surrounded by membranes R. As many as x pairs of nerves arise from the structure P. The structure P is involved in the reflex actions of our body and conduction of nerve impulses to and from another organ S of our body with which it forms CNS.
(a) Name the structure P.
(b) Name (i) bony cage Q, and (ii) membranes R.
(c) How much is x?
(d) Name the organs S.
(e) What are the reflexes involving structure P only known as?
State whether the following is simple reflex, conditioned reflex or neither of the two:
Knitting without looking: …………………..
List in tabular form three distinguishing features between cerebrum and cerebellum.
Give one example of a conditioned reflex in your own life.
Explain the following term :
Conditioned reflex
State whether the following is simple reflex, conditioned reflex or neither of the two.
Knitting without looking
State whether the following is
Blinking
Give Reason:
The hand automatically shows the direction to turn a cycle without thinking.
Mention, if the following statement is True or False
Reflex action involves brain
Categorise the following under stimulus and response.
Seeing a green light turning into red at a road crossing before applying the brakes.
