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Oxygen Transport in the Blood01:27

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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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Hemoglobin is a globular protein made up of four subunits. Two of these subunits are alpha chains, and the other two are beta chains. Each subunit contains a molecule of heme, which has an iron atom and can bind to oxygen. When an oxygen molecule binds to one heme group, it changes the shape of hemoglobin, making it easier for the other heme groups to bind oxygen as well.
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The cardiovascular system regulates the number of erythrocytes in the bloodstream to ensure optimal oxygen transport. It also prevents over-proliferation of these cells, which helps to maintain blood viscosity and flow rate.
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Erythrocytes, also known as red blood cells, constantly move through blood capillaries. As a result, they damage their plasma membrane due to the continuous friction. Typically, after 100 to 120 days, erythrocytes become rigid and fragile as they wear out. As they pass through small vessels in the spleen and liver, they can get trapped and break apart into fragments.
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Related Experiment Video

Updated: Dec 18, 2025

Measuring Frailty in HIV-infected Individuals. Identification of Frail Patients is the First Step to Amelioration and Reversal of Frailty
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Hemoglobin concentration; a pathway to frailty.

Zara Steinmeyer1, Cyrille Delpierre2, Gaelle Soriano3

  • 1Centre Hospitalier Universitaire de Toulouse, Geriatrics, Toulouse, France. steinmeyerzara@hotmail.fr.

BMC Geriatrics
|June 13, 2020
PubMed
Summary

Higher hemoglobin levels, even without anemia, are linked to reduced frailty risk in older adults. This finding suggests hemoglobin may be a key indicator for preventing adverse health outcomes in the elderly.

Keywords:
Frailty-hemoglobin-Anemia

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Area of Science:

  • Gerontology
  • Hematology
  • Public Health

Background:

  • Frailty and sub-clinical low hemoglobin are prevalent in older adults, increasing negative health risks.
  • Understanding the link between hemoglobin and frailty is crucial for geriatric care.
  • Investigating potential mediating factors like inflammation and nutrition is important.

Purpose of the Study:

  • To determine if hemoglobin concentration independently predicts frailty in older adults.
  • To explore causal pathways involving inflammation and nutrition in the hemoglobin-frailty relationship.

Main Methods:

  • Analysis of 1829 community-dwelling older adults (≥65 years) from a frailty day hospital cohort (2011-2016).
  • Comprehensive geriatric assessment and blood sample analysis.
  • Multivariate logistic regression models, controlling for age, gender, kidney function, inflammation, cognition, nutrition, and socio-economic factors.

Main Results:

  • A significant association exists between hemoglobin concentration and frailty, independent of other covariates (p < 0.005).
  • Each one-point increase in hemoglobin concentration correlates with a 14% reduced risk of frailty (OR = 0.86, 95% CI = 0.79-0.94).
  • No significant causal link was found between inflammation or nutritional status and the hemoglobin-frailty relationship (p > 0.005).

Conclusions:

  • Hemoglobin concentration is a strong, independent predictor of frailty in the elderly population.
  • These findings support the potential for using hemoglobin levels in frailty prevention strategies.
  • Identifying individuals at high risk for adverse outcomes can be enhanced by considering hemoglobin status.