Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Thermoregulation01:26

Thermoregulation

3.0K
The human body has a sophisticated thermoregulation system that employs negative feedback mechanisms to maintain an optimal core temperature. When the core temperature drops, peripheral and central thermoreceptors send signals to the hypothalamus, activating the heat-promoting center. This center triggers several responses aimed at increasing the core temperature. First, vasoconstriction reduces the flow of warm blood from internal organs to the skin so that the heat is not lost from the skin,...
3.0K
Decreased Body Temperature01:29

Decreased Body Temperature

1.2K
A decreased body temperature can occur in patients with hypothermia and frostbite. Heat loss with extended cold exposure overpowers the body's ability to create heat, resulting in hypothermia. Core temperature readings help classify hypothermia. Mild hypothermia is temperatures between 32 °C (89.6 °F) and 35°C (95 °F) and is caused by impaired thermoregulation. Moderate hypothermia is temperatures between 28 C (82.4 °F) and 32 °C (89.6 °F) caused by...
1.2K
Diversity of Archaea IV01:29

Diversity of Archaea IV

588
Hyperthermophilic archaea are a group of extremophiles thriving at temperatures above 80°C, often in hydrothermal vents and volcanic soils where conditions surpass the boiling point of water. At such temperatures, proteins, membranes, and DNA in most organisms degrade, but hyperthermophiles have evolved remarkable adaptations to maintain stability and function.Unique Cellular FeaturesHyperthermophilic membranes are composed of a monolayer of biphytanyl tetraether lipids, which resist...
588
Requirements for Human Life01:26

Requirements for Human Life

14.6K
The Earth and its atmosphere have provided humans with air, water, and food, but these are not the only requirements for survival. Humans also require a specific range of temperature and pressure that the Earth and its atmosphere provides.
Oxygen
Atmospheric air is only about 20 percent oxygen, but that oxygen is a key component of the chemical reactions that keep the body alive, including the reactions that produce ATP. Brain cells are susceptible to a lack of oxygen because they require a...
14.6K
Tonicity in Animals00:59

Tonicity in Animals

128.6K
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.,...
128.6K
Hypoxia01:23

Hypoxia

2.5K
Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
2.5K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Marine mammals as models for charting the evolution of social vocal rhythm.

BMC biology·2026
Same author

Sea ice dynamics structure narwhal presence and seasonal movements in a Northwest Greenland fjord system.

Scientific reports·2026
Same author

Extreme Rhythm Keeping in Long-Range Slow Click Communication of Sperm Whales.

Annals of the New York Academy of Sciences·2026
Same author

Lymphatic Matters in Heart Disease: Systemic and Cardiac Perspectives.

Physiology (Bethesda, Md.)·2026
Same author

Fipronil contamination impairs cardiorespiratory control of rainbow trout during aerobic exercise.

Comparative biochemistry and physiology. Toxicology & pharmacology : CBP·2026
Same author

Regeneration of the lizard heart after cryoinjury.

Experimental physiology·2026
Same journal

About the Cover.

Temperature (Austin, Tex.)·2026
Same journal

Cold-induced vasodilation: A meta-analysis.

Temperature (Austin, Tex.)·2026
Same journal

Acute Finnish sauna heat exposure induces stronger immune cell than cytokine responses.

Temperature (Austin, Tex.)·2026
Same journal

No differential effects among cooling strategies on post-exercise core temperature recovery in male athletes.

Temperature (Austin, Tex.)·2026
Same journal

Despite differences in heat dissipation, children's temperature regulation during heat stress is similar to adults' - a systematic review.

Temperature (Austin, Tex.)·2026
Same journal

Combined torso and foot heat exposure reduces acute <i>ad libitum</i> energy intake in young adults.

Temperature (Austin, Tex.)·2026
See all related articles

Related Experiment Video

Updated: Mar 20, 2026

Impedance Pneumography for Minimally Invasive Measurement of Heart Rate in Late Stage Invertebrates
08:25

Impedance Pneumography for Minimally Invasive Measurement of Heart Rate in Late Stage Invertebrates

Published on: April 4, 2020

6.4K

Hypoxic turtles keep their cool.

Jesper G Madsen1, Tobias Wang2, Peter T Madsen2

  • 1Aarhus University Hospital Skejby; Aarhus University ; Aarhus, Denmark.

Temperature (Austin, Tex.)
|May 27, 2016
PubMed
Summary
This summary is machine-generated.

Hibernating freshwater turtles remain vigilant, not comatose, during winter. They maintain neural responsiveness to light and increase activity with warmer temperatures, indicating sensory awareness during metabolic depression.

Keywords:
comaevoked potentialfreshwater turtleshibernationresponsiveness

More Related Videos

Thermal Limits Determination for Zooplankton Using a Heat Block
07:16

Thermal Limits Determination for Zooplankton Using a Heat Block

Published on: November 18, 2022

1.8K
Field-Based Thermal Physiology Assay: Cold Shock Recovery under Ambient Conditions
07:54

Field-Based Thermal Physiology Assay: Cold Shock Recovery under Ambient Conditions

Published on: March 9, 2021

3.4K

Related Experiment Videos

Last Updated: Mar 20, 2026

Impedance Pneumography for Minimally Invasive Measurement of Heart Rate in Late Stage Invertebrates
08:25

Impedance Pneumography for Minimally Invasive Measurement of Heart Rate in Late Stage Invertebrates

Published on: April 4, 2020

6.4K
Thermal Limits Determination for Zooplankton Using a Heat Block
07:16

Thermal Limits Determination for Zooplankton Using a Heat Block

Published on: November 18, 2022

1.8K
Field-Based Thermal Physiology Assay: Cold Shock Recovery under Ambient Conditions
07:54

Field-Based Thermal Physiology Assay: Cold Shock Recovery under Ambient Conditions

Published on: March 9, 2021

3.4K

Area of Science:

  • Zoology
  • Animal Physiology
  • Neuroscience

Background:

  • Freshwater turtles overwinter in hypoxic, cold conditions via metabolic depression.
  • Previous assumptions suggested hibernating turtles are comatose and unresponsive.

Purpose of the Study:

  • To investigate sensory perception and responsiveness in hibernating turtles.
  • To determine if turtles can detect environmental cues during winter dormancy.

Main Methods:

  • Evoked potential studies assessed neural responses to light and vibration in cold, hypoxic turtles.
  • Behavioral experiments monitored locomotor activity changes in response to sensory stimuli.

Main Results:

  • Hibernating turtles showed neural responsiveness to light but not vibration.
  • Turtles increased activity when exposed to light or elevated temperatures, but not vibration or oxygen.

Conclusions:

  • Hibernating turtles exhibit differential sensory system shutdown, not complete unresponsiveness.
  • These findings challenge the comatose model, suggesting turtles remain vigilant during overwintering.