PART - 2 CH - 6 Control and Coordination — Science STD 10 — Question
Gujarat BoardEnglish MediumSTD 10SciencePART - 2 CH - 6 Control and Coordination3 Marks
Question
How does the design of the body solve a problem when immediate response is needed? Where should such connection be made?
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Answer
Reflex are in the body design solve a problem, when immediate response needed. $\rightarrow$ By reflex are, the process of detecting signal or the input and responding to it by an output action is completed quickly. $\rightarrow$ The thinking about sensation of external stimulus is not involved in case of immediate response. $\rightarrow$ Nerves from different body parts to the brain meet in the spinal cord. $\rightarrow$ In case of immediate response, impulse is not transmitted from spinal cord to brain. reflex are connection : Thus a neural pathway for the sensory and motor messages that pass through the spinal cord forms the reflex arc. A very rapid response is shown through it. The following example can clarify the meaning of reflex are: Suppose by mistake and unknowingly one touches a hot object by one's hand. One would withdraw the hand all of a sudden without giving a slightest thought. Here the hot object is the source of stimulus. This stimulus activates the sensory nerve fibre in the hand and carry that impulse to the spinal cord. The sensory centres in the spinal cord receive the stimulus and transmits the response to the motor centre of the spinal cord. This motor message is transmitted through the motor nerve fibre to definite muscles of the hand, which upon contraction, withdraws the hand. The hand or its muscles act as effector organ. This entire neural path from the sensory or receptor organ, to the effector organ is a reflex arc.
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