Test: Nervous & Muscular Coordination - Class 10 MCQ

When we touch any hot object without knowing it is hot, we immediately throughout the object to safe our hand from burning. We have a sensory nerve in our brain to detect the heat. The nerves that are connected to the muscles of the hand are also connected with the sensory nerves. This connection of detecting the signal from the nerves to the muscles for immediate action is called Reflex Arc. 

Instant and automatic responses are possible by Reflex Arc. The connection between input and output nerves are connected by Reflex Arc and meets in a bundle in the spinal chord. All the nerves on their way to brain meet in a bundle in the spinal chord to send the information to the brain.

In the nervous system, effectors are parts of the body, such as muscles or glands, that respond to signals from the nervous system by performing a specific action. Receptors detect stimuli, while effectors act on the received instructions to bring about a response. Thus, the correct answer is "effector."

Motor nerves, also known as efferent nerves, carry impulses from the central nervous system to muscles or glands, enabling actions and responses. Sensory nerves transmit information in the opposite direction, from receptors to the central nervous system, while relay nerves are involved in internal signal processing within the central nervous system. Cranial nerves are specific to certain regions but can include sensory and motor functions. Therefore, the correct answer is "motor nerves."

Dendrites of the neutron receive the information and it is nothing but it requires information that are part of the neuron family. 

Likewise, the Axon of the neuron information travels as fast as electrical impulse taken by the dentritis action.

It has been emerged with neuron information and travels through the Axon.

The synapse is the tiny gap between two neurons where nerve impulses are transmitted from one neuron to the next. Neurotransmitters are chemicals that carry the impulse across this gap. Dendrites receive incoming signals, and the axon carries impulses away from the cell body, but neither of these structures forms the gap between neurons. Thus, the correct answer is "synapse."

In the reflex arc, the pathway for an automatic response to a stimulus generally bypasses the brain to enable a quicker reaction. Instead, the sensory neurons send impulses to the spinal cord, which then directs the response to the motor neurons that activate the effector. Therefore, the correct answer is "spinal cord."

Reflex activities are automatic responses to stimuli that are primarily controlled by the spinal cord, allowing for quick reactions without involving the brain. The brain is responsible for voluntary actions and higher cognitive functions, while the cerebrum and cerebellum handle functions related to movement, balance, and complex thought processes. Reflex actions bypass the brain to save time, which is why the spinal cord is the correct answer.

When we sense a smell, it is detected by the olfactory receptors in the nose. These receptors send the signal to the dendritic tip of a neuron. The signal then travels along the axon to the nerve ending, where it is transmitted to the dendritic tip of another neuron, allowing the signal to continue through the nervous system. Options (c) and (d) mention gustatory receptors, which are involved in taste, not smell. Option (b) incorrectly includes the cell body in the sequence, which is not part of the direct transmission path in this mechanism. Therefore, the correct answer is (a).

In a neuron, information travels in a specific pathway. The signal is first received by the dendrites, which transmit it to the cell body. From the cell body, the signal then travels along the axon to the nerve ending, where it can be passed to the next neuron or target cell. This pathway ensures the correct flow of information within the neuron, making option (a) the correct answer.

When a bright light is focused on our eyes, light receptors in the eyes detect the stimulus and send an impulse via sensory neurons to the spinal cord. The spinal cord then processes the information and sends a signal through motor neurons to the muscles controlling the eyelids, causing them to close. This pathway follows the correct reflex arc sequence, making option (a) the correct answer.