Advertisements
Advertisements
प्रश्न
What is spinal cord? What is its main function?
Advertisements
उत्तर
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
संबंधित प्रश्न
State one function each of cerebellum and pons.
Name two parts of the body which contain receptors of chemical stimuli.
Which part of the eye contains cells which are sensitive to light?
Fill in the following blank with suitable word :
A neuron which carries an impulse to the brain is called a ........... neuron.
What is meant by receptors and effectors? Give two examples of each.
Write the names of the regions in hindbrain. Give one function of each region.
Which of the following cannot be considered a receptor?
(a) ear
(b) nose
(c) muscle
(d) eye
Which of the following statements is correct about receptors?
The part of brain which takes part in regulating respiration in the human body is :
(a) medulla
(b) pons
(c) cerebellum
(d) cerebrum
When we touch a hot plate unknowingly, then this heat is sensed by a receptor P present in our fingers. The receptor triggers and impulse in neuron Q which transmits the message to an organ R which is a part of the central nervous system. Here the impulse is passed on to a neuron S which in turn passes it to a yet another neuron T. The neuron T passes the impulse to a tissue U in our arm. The tissue U then contracts and pulls our hand away from the hot plate.
(a) What is the name of (i) receptor P (ii) neuron Q, and (iii) organ R?
(b) What is (i) neuron S, and (ii) neuron T?
(c) Name the tissue U.
(d) What name is given to the phenomenon in which hand is pulled away quickly from the hot plate?
(e) Name the effector in this whole process.
Multiple choice question. Tick (✓) the correct choice:
Reflex actions occur under the control of
- brain
- medulla oblongata
- spinal cord
- cerebrum
Mention, if the following statement is True or False
Reflex action involves brain
Complete the following sentence with appropriate Word
Which of the following is not a natural reflex action?
In reflex action, the reflex arc is formed by ______
Give an example for conditioned reflexes.
Differentiate between Voluntary and involuntary actions.
Which of the following is not an involuntary action?
Categorise the following under stimulus and response.
Withdrawal of hand on touching a hot plate
