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Related Concept Videos

Circadian Rhythms and Gene Regulation02:19

Circadian Rhythms and Gene Regulation

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The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent...
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Hypoxia01:23

Hypoxia

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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...
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Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response01:15

Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response

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Circadian rhythms are cyclic changes that are crucial in plasma drug concentrations. Various standard circadian parameters, including core body temperature, heart rate, and other cardiovascular factors, directly impact disease states and the therapeutic response to drug therapy.
The time of drug administration is an important factor to consider, as it can influence the toxic dose of a drug. For example, a study conducted by Prins et al. in 1997 examined the effects of the timing of...
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Physiological Control of Respiration01:23

Physiological Control of Respiration

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Introduction
Breathing, a seemingly passive process, is regulated by the respiratory center in the brainstem. This center coordinates the involuntary control of respirations, which means it occurs without conscious effort, ensuring a smooth and uninterrupted pattern.
Regulation of Ventilation
The body maintains ventilation by monitoring levels of carbon dioxide (CO2), oxygen (O2), and hydrogen ion concentration (pH) in the arterial blood. Among these factors, the level of CO2 plays a crucial...
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Chemical Factors Affecting Respiration Centers01:31

Chemical Factors Affecting Respiration Centers

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Chemical factors such as changing CO2, O2, and H+ levels in arterial blood play a critical role in influencing respiration depth and rates. These variations are detected by chemoreceptors—specialized sensors located in two primary body areas. Central chemoreceptors are found throughout the brain stem, including the ventrolateral medulla, while peripheral chemoreceptors are located in the aortic arch and carotid arteries.
CO2 has a potent influence on respiration and is strictly regulated....
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Oxygen Transport in the Blood01:27

Oxygen Transport in the Blood

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Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...
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Related Experiment Video

Updated: Jul 1, 2025

Parallel Measurement of Circadian Clock Gene Expression and Hormone Secretion in Human Primary Cell Cultures
06:53

Parallel Measurement of Circadian Clock Gene Expression and Hormone Secretion in Human Primary Cell Cultures

Published on: November 11, 2016

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Circadian Clock and Hypoxia.

Francesca Sartor1, Borja Ferrero-Bordera1, Jeffrey Haspel2

  • 1Institute of Medical Psychology, Medical Faculty, LMU Munich, Germany (F.S., B.F.-B., M.M.).

Circulation Research
|March 14, 2024
PubMed
Summary
This summary is machine-generated.

The circadian clock regulates daily activity and sleep cycles, influencing oxygen usage and metabolism. This biological timing system is crucial for normal physiology and may impact conditions like stroke and myocardial infarction.

Keywords:
circadian clockshypoxiaischemiasleep

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Last Updated: Jul 1, 2025

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Area of Science:

  • Chronobiology
  • Metabolic Physiology
  • Neuroscience

Background:

  • Organisms exhibit daily rhythms in activity and sleep.
  • The circadian clock governs these temporal patterns, coordinating daily life.
  • These rhythms link the circadian clock with metabolic processes, including oxygen consumption.

Purpose of the Study:

  • To explore how the circadian clock anticipates daily oxygen usage.
  • To understand the relationship between circadian clock regulation and normal physiology.
  • To investigate the role of circadian rhythms in hypoxia and ischemia.

Main Methods:

  • Review of existing literature on circadian rhythms and metabolism.
  • Analysis of studies on circadian clock mechanisms.
  • Examination of physiological responses to altered oxygen levels.

Main Results:

  • The circadian clock anticipates daily fluctuations in oxygen demand.
  • Circadian regulation is integral to maintaining normal physiological homeostasis.
  • Disruptions in circadian rhythms may exacerbate conditions like myocardial infarction and stroke.

Conclusions:

  • The circadian clock and metabolism are intricately linked, influencing daily physiological states.
  • Understanding circadian clock's role in oxygen usage is vital for metabolic health.
  • Circadian dysregulation may represent a therapeutic target for cardiovascular and cerebrovascular diseases.