Please answer Q A student reaching for a book on a bookshelf pricks his finger on the sharp point of - Science - Control and Coordination

Question

Please answer
Q A student reaching for a book on a bookshelf pricks his finger on
the sharp point of a nail He pulls his hand away very quickly
a State the type of response which has occurred
b What is the effector in this response?
c Name the type of nerve cell which links the central nervous
system to the effector
d How are involuntary actions and reflex actions different from
each other?

Jahirul Mazumder · Accepted Answer

Dear student
Please find the solution below

a The
automatic action or response provoked by a stimulus is known as
a reflex
action The
reflex
actions,
however, show sudden responses and do not involve any thinking

b Effector here is the muscle of the arm

c Motor nerve links CNS to the effector Sensory neurons carry
information from the sensory organs to brain or spinal cord while
as motor neurons carry messages from the brain or spinal cord to
the muscle or glands

d
Involuntary actions cannot be consciously controlled For example,
we cannot consciously control the movement of food in the
alimentary canal These actions are however directly under the
control of the brain On the other hand, the reflex actions such as
closing of eyes immediately when bright light is focused show
sudden response and do not involve any thinking This means that
unlike involuntary actions, the reflex actions are not under the
control of brain
Regards