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Related Concept Videos

Veins as Blood Reservoirs01:10

Veins as Blood Reservoirs

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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...
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Veins of Upper Limbs01:17

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The human circulatory system, a marvel of biological engineering, is a complex network of vessels that transport blood throughout the body. Among these, the veins responsible for carrying blood from the upper limbs are divided into two categories: deep and superficial.
The deep venous system is primarily composed of the ulnar and radial veins. The ulnar vein, which drains the fingers through the superficial palmar venous arches, and the radial vein, which serves the palms via the deep palmar...
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Systemic veins are crucial blood vessels that return deoxygenated blood from various body tissues back to the heart. There are three systemic veins that return deoxygenated blood to the heart, they are as follows.
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Veins of Lower Limbs01:15

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The human body consists of an intricate network of veins responsible for the crucial task of blood drainage from the lower limbs. These veins can be categorized into two main types: deep veins and superficial veins.
Formed by the union of the medial and lateral plantar veins, the posterior tibial vein, rising through the calf muscle, assimilates the fibular vein. The anterior tibial vein, a superior extension of the foot's dorsalis pedis vein, merges with the posterior tibial vein at the...
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Veins01:17

Veins

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Veins are an integral part of our circulatory system, serving as the blood vessels that transport blood from all body regions to the heart. They are a network of hollow tubes that carry blood low in oxygen from the body's cells back to the heart for reoxygenation. Veins are crucial for maintaining the body's overall fluid balance and the continuous circulation of blood.
Structure of Veins:
The structure of veins is specifically designed to assist in the low-pressure transportation of...
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Venous Return

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The circulatory system plays a crucial role in ensuring the optimal functioning of the human body. One of its critical components is venous return - the process that completes the blood circulation cycle. This article will delve into the concept of venous return, how it works, and its significance to our health.
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Venous return refers to the rate at which blood flows back to the heart from the body's peripheral veins. It's an integral part of the circulatory system...
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BCG: From veins to correlates.

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Area of Science:

  • Immunology
  • Microbiology
  • Vaccinology

Background:

  • Mycobacterium tuberculosis (Mtb) causes tuberculosis (TB), a significant global health challenge.
  • Bacille Calmette-Guérin (BCG) is the only licensed TB vaccine but has variable efficacy.
  • Understanding immune responses to vaccination is crucial for developing improved TB vaccines.

Purpose of the Study:

  • To characterize the immune response in nonhuman primates following intravenous BCG vaccination.
  • To identify potential correlates of protection against Mtb infection and TB disease.

Main Methods:

  • Nonhuman primates received intravenous BCG vaccination.
  • Immune responses were comprehensively analyzed post-vaccination.
  • Correlates of protection were investigated in the context of Mtb challenge.

Main Results:

  • Intravenous BCG vaccination elicited specific immune profiles in nonhuman primates.
  • Distinct immune signatures were associated with varying levels of protection against Mtb infection.
  • The study identified candidate biomarkers indicative of vaccine-induced protection.

Conclusions:

  • Intravenous BCG vaccination induces measurable immune responses that may correlate with protection against Mtb.
  • These findings provide valuable insights for the development and evaluation of novel TB vaccines.
  • Candidate correlates of protection warrant further investigation in human clinical trials for TB vaccines.