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Pulse rhythm

Pulse rhythm

Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac...

Rectangular and Triangular Pulse Function

Rectangular and Triangular Pulse Function

The unit rectangular pulse function is mathematically represented by a rectangular function centered at the origin with a height of one unit. This function is defined by two parameters: T, which specifies the center location of the pulse along the time axis, and τ, which determines the pulse duration.
For example, consider a rectangular pulse with a 5V amplitude, a 3-second duration, and centered at t=2 seconds. This pulse can be expressed using the rectangular function, written as,

Regulation of Pulse

Regulation of Pulse

Pulse regulation involves physiological mechanisms that ensure adequate blood flow throughout the body. The heartbeat, regulated by the autonomic nervous system, is influenced by hormonal balance, physical activity, and emotional state.

Pulse

Pulse

When the heart pumps blood out, arterial elastic fibers play a crucial role in sustaining a high-pressure gradient. They expand to accommodate the received blood and then recoil - a process known as the pulse that can be either manually palpated or electronically quantified. Despite a reduction in its effect with increased distance from the heart, elements of the pulse's systolic and diastolic components persist, observable even at the arteriole level.
The pulse serves as a clinical...

Pulse

Pulse

The pulse is one of the most fundamental physiological indicators of the body's cardiovascular health. It is the rhythmic expansion and contraction of the arterial walls in response to the pressure generated by the heart's pumping action.
Pulse Rate and its Significance
Pulse rate, often measured in beats per minute (bpm), reflects the heart rate (HR), which is influenced by numerous factors such as stress, physical activity, and hormonal changes. A normal resting adult pulse rate falls...

Special considerations while measuring pulse

Special considerations while measuring pulse

Assessing a patient's pulse is a fundamental skill in healthcare, but certain situations require special attention:

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Related Experiment Video

Updated: Dec 24, 2025

Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems

Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems

Published on: July 30, 2019

How pulse disturbances shape size-abundance pyramids.

Claire Jacquet^1,2, Isabelle Gounand^1,2,3, Florian Altermatt^1,2

¹Department of Evolutionary Biology and Environmental Studies, University of Zurich, Zürich, Switzerland.

Ecology Letters

|April 14, 2020

Summary

Disturbances significantly alter ecological pyramids, narrowing their base and reducing biomass. This study reveals how non-size-selective disturbances disproportionately impact larger species within ecosystems.

Keywords:

Body-size community size structure disturbance frequency disturbance intensity extreme events metabolic theory perturbations protist communities size spectrum

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Last Updated: Dec 24, 2025

Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems

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Area of Science:

Ecology
Theoretical Ecology
Ecosystem Dynamics

Background:

Ecological pyramids typically assume stable ecosystem conditions, which are rarely met in nature.
Real-world ecosystems frequently face disturbances that disrupt steady states.
Existing models struggle to predict pyramid responses under dynamic environmental conditions.

Discussion:

This research develops a model predicting size-abundance pyramid responses to disturbance frequency and intensity.
The model utilizes allometric scaling between population growth rate and body size.
It accounts for disturbances affecting all species uniformly within a trophic guild.

Key Insights:

Disturbances predictably narrow the base of size-abundance pyramids.
Disturbances lead to a decrease in pyramid height and overall community biomass.
These effects are non-linear and depend on disturbance characteristics.

Outlook:

Experimental validation using microbial communities supports the theoretical predictions.
The findings highlight how non-size-selective disturbances can disproportionately affect larger species.
This work provides a framework for understanding ecosystem structure under fluctuating conditions.