I: | The PNS is divided into two divisions called somatic neural system and autonomic neural system. |
II: | The somatic neural system relays impulses from the CNS to skeletal muscles while the autonomic neural system transmits impulses from the CNS to the involuntary organs and smooth muscles of the body. |
III: | The autonomic neural system is further classified into sympathetic neural system and parasympathetic neural system. |
IV: | Visceral nervous system is the part of the peripheral nervous system that comprises the whole complex of nerves, fibres, ganglia, and plexuses by which impulses travel from the central nervous system to the viscera and from the viscera to the central nervous system. |
1. | Arrival of action potential at presynaptic terminal → Binding of neurotransmitters to postsynaptic receptors → Release of neurotransmitters into the synaptic cleft → Opening of calcium channels |
2. | Arrival of action potential at presynaptic terminal → Opening of calcium channels → Release of neurotransmitters into the synaptic cleft → Binding of neurotransmitters to postsynaptic receptors |
3. | Binding of neurotransmitters to postsynaptic receptors → Opening of calcium channels → Arrival of action potential at presynaptic terminal → Release of neurotransmitters into the synaptic cleft |
4. | Release of neurotransmitters into the synaptic cleft → Arrival of action potential at presynaptic terminal → Opening of calcium channels → Binding of neurotransmitters to postsynaptic receptors |
1. | Dendrites → Cell body → Axon hillock → Axon → Synaptic terminals |
2. | Axon → Cell body → Dendrites → Synaptic terminals → Axon hillock |
3. | Synaptic terminals → Axon hillock → Axon → Cell body → Dendrites |
4. | Cell body → Dendrites → Axon → Axon hillock → Synaptic terminals |
1. | Effector → Sensory neuron → Interneuron → Motor neuron → Receptor |
2. | Receptor → Motor neuron → Interneuron → Sensory neuron → Effector |
3. | Receptor → Sensory neuron → Interneuron → Motor neuron → Effector |
4. | Sensory neuron → Effector → Receptor → Motor neuron → Interneuron |
Statement I: | Sensory nerves consist of nerve fibers that conduct impulses toward the central nervous system (CNS). |
Statement II: | Motor nerves consist of nerve fibers that conduct impulses away from the CNS. |
Column I | Column II | ||
A | Sensory neurons | P | carry signals from the CNS to effectors (muscles or glands) |
B | Motor neurons | Q | connect sensory and motor neurons |
C | Interneurons | R | transmit signals from sensory receptors to the central nervous system |
A | B | C | |
1. | P | Q | R |
2. | Q | P | R |
3. | R | P | Q |
4. | R | Q | P |
1. | The limbic system is primarily involved in controlling voluntary movements. |
2. | It is primarily responsible for the regulation of vision and hearing. |
3. | The limbic system is involved in emotion, memory, and arousal. |
4. | It coordinates high cognitive functions like reasoning and language. |