Advertisements
Advertisements
Question
P is a cell (or group of cells) in the human body which is sensitive to a particular type of stimulus and conveys the messages to CNS through nerves Q. On the other hand, R is a part of the human body which can respond to a stimulus according to the instructions sent from the CNS through nerves S.
(a) What is P? Name five organs which contain cells (or group of cells) like P.
(b) Name the nerves Q.
(c) What is R? Give two examples of R.
(d) Name nerves S.
(e) How do messages travel through the nerves Q and S?
Advertisements
Solution
(a) P is a receptor. The five organs which contain receptors are: eyes, ears, nose, tongue and skin.
(b) Q represents sensory nerves. Sensory nerves bring impulses from sensory organs to the CNS.
(c) R is an effector organ. Effectors are part of the human body which can respond to a stimulus according to the instructions sent from the CNS though the motor nerves. Two examples of effector organs are the muscles and glands.
(d) S represents motor nerves. Motor nerves carry impulse from the CNS to the effector organs like the muscles or glands.
(e) Messages travel in the form of electrical impulses or nerve impulses through sensory nerves (Q) and motor nerves (S).
APPEARS IN
RELATED QUESTIONS
Name one gustatory receptor and one olfactory receptor present in human beings.
Name two parts of the body which contain receptors of chemical stimuli.
Fill in the following blank with suitable word :
A neuron which carries an impulse to the brain is called a ........... neuron.
Name the function of cerebrum.
What is a reflex action? Explain with the help of an example.
All the voluntary actions of our body are controlled by :
(a) cerebrum
(b) cerebellum
(c) pons
(d) medulla
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
Write down the following activities in the correct order for a simple reflex arc:
(a) impulse travels in the motor fibre
(b) impulse travels in the sensory fibre
(c) effector organ stimulated
(d) impulse crosses the synapse
what do we refer to in the nervous system when we say:
Natural and conditioned …………………
State whether the following is simple reflex, conditioned reflex or neither of the two.
Sudden application of brakes of the cycle on sighting an obstacle in front
Explain the following term :
Conditioned reflex
State whether the following is simple reflex, conditioned reflex or neither of the two.
Blushing
State whether the following is
Constriction of pupil
State whether the following is
Cleaning
Give Technical Term:
The scientist, who conducted experiment on a dog to show conditioned reflex
Mention, if the following statement is True or False
Reflex action involves brain
Mention, if the following statement is True or False
A reflex action is a spontaneous response to a stimulus.
Complete the following sentence with appropriate Word
Which of the following is not a natural reflex action?
Reflex actions are mediated through ____________.
Given alongside is a partial diagrammatic representation of a certain phenomenon pertaining to the nervous system.
 |
- Name the parts numbered 1-7.
- Name the phenomenon that the diagram depicts and define it.
- Give the technical term for the point of contact between two nerve cells.
- Name the parts not shown in the diagram that should be included to complete the pathway of the phenomenon.
