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Veins

Veins

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...

Veins of Lower Limbs

Veins of Lower Limbs

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...

Veins of Upper Limbs

Veins of Upper Limbs

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...

Seedless Vascular Plants

Seedless Vascular Plants

Seedless Vascular Plants Were the First Tall Plants on Earth

Veins of the Abdomen and Pelvis

Veins of the Abdomen and Pelvis

The human body is a complex system of interconnected parts, and the circulatory system plays a crucial role in maintaining overall health. One key component of this system is the inferior vena cava, a large vein responsible for returning blood from the abdominopelvic viscera and abdominal walls to the heart.
The inferior vena cava is fed by numerous smaller veins. The lumbar veins, for instance, drain the posterior abdominal wall, emptying both directly into the inferior vena cava and into the...

Venules

Venules

Venules are an integral part of the microscopic circulatory system that bridges the gap between capillaries and veins.
Venules are much smaller in diameter compared to their larger counterparts, the veins. They are generally 8 to 100 micrometers in diameter, significantly smaller than the size of veins. The walls of venules are thin, consisting of the endothelium, a thin layer of connective tissue, and occasionally a few smooth muscle cells. This structural simplicity is a stark contrast...

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Related Experiment Video

Updated: Jul 2, 2025

Relating Stomatal Conductance to Leaf Functional Traits

Relating Stomatal Conductance to Leaf Functional Traits

Published on: October 12, 2015

Leaf Vein Patterning.

Enrico Scarpella¹

¹Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada;

Annual Review of Plant Biology

|February 21, 2024

Summary

This summary is machine-generated.

Leaf vein patterns are not solely controlled by auxin transport. New research suggests a combination of auxin transport, diffusion via plasmodesmata, and signal transduction shapes these complex plant structures.

Keywords:

auxin production auxin signaling auxin transport plasmodesmata procambium vascular pattern venation

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Area of Science:

Plant biology
Developmental biology
Molecular biology

Background:

Leaf venation patterns exhibit significant diversity, ranging from simple to complex networks.
Historically, polar auxin transport was considered the sole driver of leaf vein formation.

Purpose of the Study:

To investigate the mechanisms underlying leaf vein patterning.
To explore the roles of auxin transport, diffusion, and signal transduction in vein development.

Main Methods:

The study integrates existing evidence on plant hormone transport and signaling pathways.
It proposes a multifactorial model for vein pattern determination.

Main Results:

Recent evidence indicates that leaf vein patterning is influenced by polar auxin transport, facilitated auxin diffusion through plasmodesmata, and auxin signal transduction.
The precise contribution of signal transduction and the sites of auxin production remain to be elucidated.

Conclusions:

Leaf vein development is a complex process involving multiple interacting mechanisms.
Future research is needed to fully understand auxin production sites and the model's ability to explain natural vein pattern diversity.