6 public questions tagged with this topic.
Saltatory conduction occurs in myelinated neurons, where impulses jump between nodes of Ranvier, increasing conduction speed.
Ref: NCERT Class 11 Biology Chapter 18: Neural Control and Coordination Nerve Impulse - Resting Potential Action Potential and Transmission
The axon transmits nerve impulses away from the neuron's cell body.
Ref: NCERT Class 11 Biology Chapter 18: Neural Control and Coordination Neural System and Neuron - Structure Types and Functions
The neuromuscular junction is the site where motor neurons transmit signals to muscle fibers, triggering contraction.
Ref: NCERT Class 11 Biology Chapter 17: Locomotion and Movement Types of Movement - Amoeboid Ciliary Flagellar Muscular
When a nerve impulse finally reaches a muscle at the neuromuscular junction, the muscle fibres must move to complete the response. This critical movement occurs at the microscopic cellular level when individual muscle cells change their shape to shorten. Muscle cells specifically achieve this dramatic shape change using specialized cellular proteins. When the electrical nerve impulse properly stimulates the muscle, it triggers a complex cascade that rapidly alters both the physical shape and the internal structural arrangement of these special proteins within the cell. This newly formed arrangement invariably results in a much shorter, contracted form of the muscle cells. Consequently, this causes the entire muscle tissue to pull and contract, thereby producing the desired physical movement or action in direct response to the original environmental stimulus. This distinct dual alteration—changing both their physical shape and internal structural arrangement—is what actively drives muscle contraction.
Ref: NCERT Class 10 Science chapter 6 control and coordination
When a nerve impulse finally reaches a muscle at the neuromuscular junction, the muscle fibres must move to complete the response. This critical movement occurs at the microscopic cellular level when individual muscle cells change their shape to shorten. Muscle cells specifically achieve this dramatic shape change using specialized cellular proteins. When the electrical nerve impulse properly stimulates the muscle, it triggers a complex cascade that rapidly alters both the physical shape and the internal structural arrangement of these special proteins within the cell. This newly formed arrangement invariably results in a much shorter, contracted form of the muscle cells. Consequently, this causes the entire muscle tissue to pull and contract, thereby producing the desired physical movement or action in direct response to the original environmental stimulus. Thus, the fundamental cellular response of these tissues to a nerve impulse is to immediately change their physical shape.
Ref: NCERT Class 10 Science chapter 6 control and coordination
reflex actions represent a crucial and fascinating evolutionary adaptation. A reflex is a sudden, involuntary reaction to a potentially harmful stimulus. The specific pathway taken by the nerve impulses in a reflex action is called a reflex arc. Because the conscious thinking process of the brain is relatively slow and involves complex interactions of many millions of neurons, reflex arcs have evolved to facilitate immediate responses. If we were to consciously think about pulling a hand away from a hot object, we might get burnt before the thought process completes. Therefore, reflex arcs are formed in the spinal cord, where incoming sensory nerves meet outgoing motor nerves, allowing the signal to safely bypass the brain for a rapid, life-saving response, while still sending a message to the brain for later processing. This makes the reflex arc the precise term for this specialized, rapid neural pathway.
Ref: NCERT Class 10 Science chapter 6 control and coordination
