Tag: nervous system
Questions Related to nervous system
Put the following parts of a reflex arc in the correct order beginning with the sensory receptor.
A. Motor neuron B. Interneuron C. Effector D. Sensory neuron E. Sensory receptor
-
E, D, B, A, C
-
E, D, A, B, C
-
A, B, C, D, E
-
A, E, D, B, C
In spite of the presence of complex neuron networks, reflex arcs continue to be more efficient for quick responses.
-
True
-
False
Reflex arcs are formed in the
-
Brain
-
Spinal cord
-
Heart
-
Eye
The components of a reflex arc are
-
Sensory neuron, receptor, motor neuron
-
Receptor, sensory neuron, center, motor neuron
-
Receptor, sensory neuron, center, motor neuron, effector organ
-
Motor neuron, sensory neuron, center, effector organ
A reflex arc is a simple nervous pathway and consists of the sensory/afferent neuron, center (spinal cord), motor/efferent neuron and effector organ. The afferent/sensory neurons transmit the sensory information from sensory receptors to the spinal cord (sensory pathway). The interneurons of spinal cord integrate the incoming information and signal is relayed to motor/efferent neurons. The motor pathway transmits the signal from motor neurons to the effector organs (muscles and glands etc). Thus, reflex arc transmits the information from receptor to effector via the spinal cord.
Reflex arc made of two neurons is
-
Asynaptic
-
Monosynaptic
-
Disynaptic
-
Polysynaptic
Which one of the following reflex do not include innervation of brain?
-
Spinal reflex
-
Cranial reflex
-
Afferent reflex
-
Efferent reflex
Spinal reflexes are responses to stimuli arising from the spinal cord. These responses are quick usually to protect the body from a dangerous situation.
Which one of the following is the component of reflex arc?
-
Sensory neuron
-
Brain
-
Motor neuron
-
Both A and C
A reflex arc is a simple nervous pathway and consists of a sensory/afferent neuron, center (spinal cord), motor/efferent neuron and effector organ. The afferent/sensory neurons transmit the sensory information from sensory receptors to the spinal cord (sensory pathway). The interneurons of spinal cord integrate the incoming information and signal is relayed to motor/efferent neurons. The motor pathway transmits the signal from motor neurons to the effector organs (muscles and glands etc). Thus, reflex arc transmits the information from receptor to effector via the spinal cord. The brain is not the part of the reflex arc.
What is the correct path of a reflex arc?
-
$Sensory stimulus \rightarrow Dendrite \rightarrow Axon$
-
$ Motor nerves \rightarrow Acetylcholine \rightarrow Adjustor neuron$
-
$ Efferent nerves \rightarrow Connector nerves \rightarrow Motor nerves$
-
$Afferent nerves \rightarrow Efferent nerves \rightarrow Connector nerves$
The delay in transmission from the dorsal to the ventral root across the spinal cord for the reflex pathways 'A', 'B', 'D' and 'C' respectively is 0.5 ms,1.0 ms, 1.5 ms, and 2.0 ms.Identify the correct option: (Average synaptic delay =0.5 ms)
-
A=monosynaptic , B=bisynaptic , C=trisynaptic
-
A=monosynaptic , B= trisynaptic , D=bisynaptic
-
A=monosynaptic , C=trisynap tic , D=quadrisynaptic
-
A=monosynaptic , D=trisynaptic , C=quadrisynaptic
Monosynaptic transmission involves only two neurons, one sensory and one motor. In this, the signal is passed from one neuron to another neuron. In multisynaptic transmission, more than two neurons are involved. In this case, there is some delay in transmission of neural signal at the synapses. This is because more synapses are encountered in a reflex pathway and hence it takes more time to effect the reflex. In the given problem, it is given than average synaptic delay is 0.5 ms. Reflex pathway A is monsynaptic as it is taking 0.5 ms for transmission of signal. Reflex pathway B is disynaptic as it is taking 1.0 ms for signal transmission. This is because there are three neurons are involved. From sensory neuron each motor neuron takes 0.5 ms for transmission of signal. Reflex pathway for D is trisynaptic as it is having 1.5 ms of synaptic delay. Similarly, reflex pathway for C is quadrisynaptic as it is having 2.0 ms of synaptic delay.
Reflex arc consists of
-
Motor nerve
-
Sensory nerve
-
Both sensory and motor nerves
-
None of the above
The primary components of the reflex arc are the sensory-nerve cells (or receptors), that receive stimulation, in turn connecting to other nerve cells, that activate muscle cells (or effectors), which perform the reflex action.