Define Stimulus .
Any agent in the environment that may causes an organism to respond.
ICSE
What is a Neuron.
The structural and functional unit of the nervous system .
Define Reflex action.
The automatic respone by a body towards the stimulus.
Define Cerebellum.
Part of the brain which controls and coordinates skeletal muscles and maintains balance of the body.
Define Cerebrum.
Part of the brain which acts as control centre of the body.
What is sinuatrial node ?
The beating of heart is controlled by the pacemaker which is also called sinuatrial node.
Write the importance of blood transfusion.
In cases of serious loss of blood arising as a result of injuries and various diseases and in serious forms of anaemia, tranfusion of blood is the only way by which can be saved.
What is a sphygmomanometer ?
Sphygmomanometer is an instrument used to measure the blood pressure.
Why is blood group O called the universal donor ?
The blood group O is called the universal donor because it can donate blood to all types.
What is blood transfusion ?
The transfer of blood from one person to another is called transfusion.