what are the topics in control and coordination
Answers
Explanation:
Coordination-The working together of various organs of the body of an organism in a proper manner to produce appropriate reaction to a stimulus is called coordination.
? �Stimulus- The changes in the environment to which an organism responds and reacts is called Stimulus
? �Control & coordination in animals- takes place by (i) Nervous system & (ii) Endocrine system
? �Nervous system
Stimulus ? Receptor organ ?� Sensory nerve ? Brain/Spinal cord
? Response� ? Effector organ�� ?��Motor nerve
?��� Endocrine system
Stimulus ? Endocrine organ ?� Secrete hormone ? Hormone in blood ?
Response� ?� Target organ
?�Parts of the Nervous system �
(i) Brain� (ii) Spinal cord� (iii) Nerves (Neurons)
? �A Neuron is the structural & functional unit of Nervous system
? �Parts of a neuron-
(i) Dendrites� (ii)� Cell body (iii) Axon
? �Synapse- Space/junction between two adjacent nerves is called Synapse.
? �Passing of information takes place �
(i) By Electric impulse (inside the neuron) and
(ii) In the form of chemicals (At synapse)
? �Reflex action- Spontaneous, involuntary and automatic response to a stimulus to protect us from harmful situations. Eg. On touching a hot object unknowingly we instantly withdraw our hand.
? �Reflex arc- The pathway of the reflex action is called Reflex arc.
Stimulus ? Receptor organ ?� Sensory nerve ? Spinal cord ?Effector organ?� Response
Refer to figure 7.2 page no. 117 of N.C.E.R.T� Text book)
? �Nervous system-
(1)� Central Nervous system (CNS)
(2) Peripheral Nervous system(PNS)
(i) Brain����������������������������� (i)� Autonomic Nervous system
(ii)� Spinal cord������������������� (ii)� Voluntary Nervous system
? �Brain�
(i)� Centre of coordination of all activities
(ii)� Thinking is involved
(iii) Complex process
? �Parts of brain-�����
� Refer to figure 7.3 page no. 118 of N.C.E.R.T� Text book