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Related Concept Videos

Regulation of Stroke Volume01:27

Regulation of Stroke Volume

The regulation of stroke volume, which is the amount of blood the heart pumps out during each heartbeat, is critical for maintaining a healthy circulatory system. Stroke volume is influenced by three main factors: preload, contractility, and afterload.
Preload refers to the degree of stretch on the heart before it contracts. It's analogous to the stretching of a rubber band; the more it's stretched, the more forcefully it snaps back. This concept is encapsulated in the Frank-Starling law of the...
Hormonal Regulation of Blood Pressure01:17

Hormonal Regulation of Blood Pressure

Endocrinal or hormonal intervention in the cardiovascular system is predominantly exerted by the catecholamines - epinephrine and norepinephrine, as well as a slew of hormones that interact with renal function to modulate blood volume.
Epinephrine and Norepinephrine
The adrenal medulla releases epinephrine and norepinephrine, catecholamines that enhance and extend the sympathetic or "fight or flight" physiological response. These hormones escalate heart rate and the force of contraction while...
Regulation of Water Intake01:25

Regulation of Water Intake

Osmolality refers to the number of solute particles per kilogram of solvent in a solution. Plasma osmolality specifically indicates the total number of solute particles per kilogram of water in blood plasma. This value reflects the body's hydration status and is tightly regulated through mechanisms controlling water intake and output. While water consumption is a conscious decision, the body has intrinsic regulatory systems to maintain fluid balance. Dehydration, a state of water deficit...
Veins as Blood Reservoirs01:10

Veins as Blood Reservoirs

Veins, while chiefly responsible for circulating blood back to the heart, also function as storage vessels for blood. They house approximately 64 percent of the body's total blood volume, a feat made possible by their high capacitance—the inherent ability to expand and accommodate large volumes of blood, even under low pressure. The large diameter and thin walls of veins augment their distensibility, significantly more so than arteries, due to their classification as capacitance vessels. When...
Fluid Movement Between Compartments01:18

Fluid Movement Between Compartments

The force applied by fluids against a surface, known as hydrostatic pressure, initiates the transfer of fluid among different compartments. Within our blood vessels, the blood's hydrostatic pressure is a result of the heart's pumping action. At the arteriolar end of capillaries, hydrostatic pressure (capillary blood pressure) exceeds the opposing colloid osmotic pressure created primarily by plasma proteins like albumin. This discrepancy in pressure propels plasma and nutrients from the...
Tonicity in Animals00:59

Tonicity in Animals

The tonicity of a solution determines if a cell gains or loses water in that solution. The tonicity depends on the permeability of the cell membrane for different solutes and the concentration of nonpenetrating solutes in the solution within and outside of the cell. If a semipermeable membrane hinders the passage of some solutes but allows water to follow its concentration gradient, water moves from the side with low osmolarity (i.e., less solute) to the side with higher osmolarity (i.e.,...

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Related Experiment Video

Updated: Jun 28, 2026

In Vitro Model of Physiological and Pathological Blood Flow with Application to Investigations of Vascular Cell Remodeling
07:30

In Vitro Model of Physiological and Pathological Blood Flow with Application to Investigations of Vascular Cell Remodeling

Published on: November 3, 2015

Cell volume regulation: physiology and pathophysiology.

I H Lambert1, E K Hoffmann, S F Pedersen

  • 1Department of Biology, University of Copenhagen, Copenhagen, Denmark. ihlambert@bio.ku.dk

Acta Physiologica (Oxford, England)
|October 24, 2008
PubMed
Summary
This summary is machine-generated.

Cell volume changes trigger signaling pathways for cell adaptation and function restoration. These volume changes are crucial signals in both normal physiology and disease states.

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Area of Science:

  • Cell Biology
  • Physiology
  • Pathophysiology

Background:

  • Cell volume perturbations activate intracellular signaling cascades, leading to adaptive responses and restoration of cellular function.
  • Cell volume challenges occur in various physiological (e.g., nutrient absorption, apoptosis) and pathophysiological (e.g., hypoxia, hyponatremia) conditions.
  • Increasing or decreasing cell volume can act as a specific signal regulating physiological processes like transport, migration, proliferation, and cell death.

Purpose of the Study:

  • To review recent advancements in understanding cell volume sensing mechanisms.
  • To highlight the relationship between cell volume regulation and organismal physiology and pathophysiology.

Main Methods:

  • Literature review of recent major developments in cell volume regulation research.
  • Emphasis on sensors, transducers, and effectors involved in converting volume changes into physiological responses.

Main Results:

  • Significant progress has been made in identifying sensors, transducers, and effectors of cell volume changes.
  • Cell volume regulation is intrinsically linked to broader physiological and pathophysiological processes.

Conclusions:

  • While sensing mechanisms are not fully elucidated, key components are being identified.
  • Cell volume regulation plays a critical role in maintaining organismal homeostasis and responding to disease.