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Related Concept Videos

Sensation01:21

Sensation

1.3K
Sensory receptors are specialized neurons that respond to specific types of external stimuli, initiating the process known as sensation. This occurs when sensory input, such as light entering the eye, is detected by these receptors, causing chemical changes in the cells of the retina. These cells then convert the sensory stimulus into action potentials that are transmitted to the central nervous system, a process termed transduction.
Absolute thresholds can quantify the sensitivity of sensory...
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Resistivity01:22

Resistivity

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When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as:
4.4K
Resistance01:19

Resistance

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When a current moves through any conductor, the conductor causes some level of difficulty for the current to flow. The measure of that difficulty is known as the resistance of the material and is represented by R. Every material has its own resistance. In the case of conductors, heat is emitted whenever a current passes through them. Resistance depends on the resistivity of the material. Resistivity is a characteristic of the material used to fabricate electrical components, whereas the...
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Impact Loading01:19

Impact Loading

669
Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
In cases of elastic deformation,...
669
Resistance and Conductance01:25

Resistance and Conductance

492
A conductor's DC resistance at a given temperature is influenced by its resistivity, length, and cross-sectional area. Resistivity is an inherent property of the conductor material, with annealed copper serving as the international standard for measurement. For instance, the resistivity of hard-drawn aluminum at 20 degrees Celsius is 61% of the standard conductivity of annealed copper.
Various factors impact the resistance of a conductor. Spiraling in stranded conductors increases their...
492
Equivalent Resistance01:16

Equivalent Resistance

939
In circuit analysis, situations often arise where resistors are neither in series nor parallel configurations. To tackle such scenarios, three-terminal equivalent networks like the wye (Y) (Figure 1 (a)) or tee (T) and delta (Δ) (Figure 1 (b)) or pi (π) networks come into play. These networks offer versatile solutions and are frequently encountered in various applications, including three-phase electrical systems, electrical filters, and matching networks.
939

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Related Experiment Video

Updated: Jan 20, 2026

A Protocol of Manual Tests to Measure Sensation and Pain in Humans
07:28

A Protocol of Manual Tests to Measure Sensation and Pain in Humans

Published on: December 19, 2016

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[Dyspnea sensation during resistive loading].

Y Kikuchi1

  • 1First Department of Internal Medicine, Tohoku University School of Medicine, Sendai, Japan.

Nihon Kyobu Shikkan Gakkai Zasshi
|April 1, 1992
PubMed
Summary
This summary is machine-generated.

The sensation of dyspnea is closely linked to the ventilatory command signal, unaffected by breathing resistance. Subjects may reduce functional residual capacity (FRC) to lessen dyspnea during breathing challenges.

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Area of Science:

  • Respiratory Physiology
  • Sensory Perception
  • Cardiopulmonary Research

Context:

  • Investigating the complex interplay between respiratory mechanics and the subjective experience of breathlessness.
  • Understanding how external loads affect respiratory muscle workload and ventilatory control.

Purpose:

  • To determine the relationship between the sensation of dyspnea, respiratory muscle oxygen consumption (VO2 resp), minute ventilation, and occlusion pressure.
  • To assess the impact of inspiratory resistive loading on these physiological parameters and the perception of dyspnea.

Summary:

  • Seven healthy volunteers underwent incremental dead space loading with and without inspiratory resistive loads.
  • Dyspnea sensation and VO2 resp increased with ventilation and resistance, but a unique relationship between dyspnea, VO2 resp, and occlusion pressure persisted.
  • A cortical response potentially decreasing functional residual capacity (FRC) was observed to mitigate dyspnea during loading.

Impact:

  • The ventilatory command signal is a key determinant of dyspnea sensation.
  • Findings suggest a potential volitional or cortical mechanism for dyspnea modulation via FRC adjustment.
  • Provides insights into the neural control of breathing and the perception of respiratory effort.