Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Reflexes:
It is of interest to know, that all sensory information does not have to go to the - brain before we can react to a stimulus. Our responses to certain stimuli are simple unvaried and quick. For instance, if a finger is too close to a burning match, receptor cells on the skin send the infarmation on a nerve to the spinal cord, and a 'reflex action' is taken to move the finger away fm the fire. Such 'reflex drcuits' are well distributed and one is shown in Fig.
Now let us see what happens when a pin pricks the finger.
1 The pin p-rick is the stimulus which activates a receptor cell at that point.
2 A nerve impulse is transmitted away from the skin along a sensory neuron to the spinal cord.
3 The impulse is now passed through the inter neuron to the motor neuron and finally passes to the-muscle which pulls the hand back from the painful event.
The brain is not normally involved in such simple reflex actions. Only after the event, is the brain informed and we become conscious of what has happened. The time gap between the stimulus and the response is about 1115th of a second and this is often crucial for survival. For instance, a person who is driving a car has to apply his brakes to avoid a sudden collision with another car. His reflex action timing is important if he ( has to avoid the accident. Similarly, the reflexes of an airplane pilot have to be fast to avoid disaster. Human capacity to handle equipment and machines is limited by the time taken by one's reflexes.
#qDescribe the factors which decide the broad area of Scientific activityuestion..
what is inside a volcano
Observing the phases of the moon Over the time of a lunar month have the children make nightly observations and illustrate drawings of the moon. Start at new moon and continue
To show that soil contains air:- Place some soil in a glass jar or bottle and slowly pour water over it. Observe the air bubbles that increase by the water from the soil.
The effect of petrol on surface tension Being sure that the plate is has to be clean. It is wise to rinse the plate in cold water for a time before filling it. Instead of soap,
What is the only usual mineral to be strongly magnetic other than magnetite: Pyrrhotite
Ship-building: The shipbuilding industry in the seventeenth century. witnessed far-reaching changes that mainly resulted from imitating European techniques. The Indian sea-g
respiration in different animals
What is Pancreatic juice Pancreatic juice is alkaline in nature (pH about 8.0) and contains both organic and inorganic substances. The enzyme components are trypsin, c
Interstellar and Intergalactic Space: The space between the stars and the galaxies looks empty, doesn't it? But this 1s not true. In the great dark between stars in the galaxie
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd