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Primary Active Transport

Primary Active Transport

In contrast to passive transport, active transport involves a substance being moved through membranes in a direction against its concentration or electrochemical gradient. There are two types of active transport: primary active transport and secondary active transport. Primary active transport utilizes chemical energy from ATP to drive protein pumps that are embedded in the cell membrane. With energy from ATP, the pumps transport ions against their electrochemical gradients—a direction...

Primary Active Transport

Primary Active Transport

In contrast to passive transport, active transport involves a substance being moved through membranes in a direction against its concentration or electrochemical gradient. There are two types of active transport: primary active transport and secondary active transport. Primary active transport utilizes chemical energy from ATP to drive protein pumps embedded in the cell membrane. With energy from ATP, the pumps transport ions against their electrochemical gradients—a direction they would...

Primary and Secondary Growth in Roots and Shoots

Primary and Secondary Growth in Roots and Shoots

Vascular plants, which account for over 90% of the Earth’s vegetation, all undergo primary growth—which lengthens roots and shoots. Many land plants, notably woody plants, also undergo secondary growth—which thickens roots and shoots.

Primary Distribution

Primary Distribution

Primary distribution systems deliver electrical power from substations to consumers through various voltage classes, with 15-kV class voltages being predominant among U.S. utilities. Older 2.5- and 5-kV classes are being replaced by 15-kV primaries, while higher 25- to 34.5-kV classes are used in high-density urban areas and rural regions with long feeders. Three-phase, four-wire multigrounded systems are widely employed for balanced power delivery, using the neutral wire as a grounding point.

Primary Production

Primary Production

The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.

Primary Lymphoid Organs

Primary Lymphoid Organs

Primary lymphoid organs are pivotal in the formation, development, and maturation of lymphocytes, the white blood cells that serve as the backbone of our immune system. This crucial function underscores their fundamental role in maintaining our overall health and immunity. The two primary lymphoid organs of prime importance are the red bone marrow and the thymus.
The red bone marrow is a soft, spongy tissue nestled in the interior of long bones such as the humerus and femur. It is the site...

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Related Experiment Video

Updated: Jan 26, 2026

Functional Assessment of the Donor Heart During Ex Situ Perfusion: Insights from Pressure-Volume Loops and Surface Echocardiography

Functional Assessment of the Donor Heart During Ex Situ Perfusion: Insights from Pressure-Volume Loops and Surface Echocardiography

Published on: October 11, 2022

Primary Aldosteronism: Novel Insights.

Konstantinos Stavropoulos¹, Konstantinos Imprialos¹, Vasilios Papademetriou²

¹2nd Propedeutic Department of Internal Medicine, Aristotle University, Thessaloniki, Greece.

Current Hypertension Reviews

|April 17, 2019

Summary

This summary is machine-generated.

Primary aldosteronism, a common cause of hypertension, presents increased cardiovascular risks. Novel insights may simplify diagnosis and reveal new therapeutic targets for this endocrine syndrome.

Keywords:

CXCR4 PET scan KCNJ5 mutations Primary aldosteronism SIAH1 arterial hypertension cardiovascular disease secondary hypertension subclinical aldosteronism.

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Last Updated: Jan 26, 2026

Functional Assessment of the Donor Heart During Ex Situ Perfusion: Insights from Pressure-Volume Loops and Surface Echocardiography

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Published on: April 14, 2017

Area of Science:

Endocrinology
Cardiovascular Medicine
Hypertension Research

Background:

Primary aldosteronism is a frequent cause of secondary hypertension.
Patients with this endocrine syndrome face elevated cardiovascular risks compared to individuals with essential hypertension.

Purpose of the Study:

To critically review and present novel insights in primary aldosteronism.
Focus on clinically relevant advancements and future perspectives.

Main Methods:

Narrative review based on meticulous evaluation of existing data.
Synthesis of current knowledge and future research directions.

Main Results:

Emerging evidence suggests a potential subclinical form of primary aldosteronism.
Advances in understanding the molecular basis may lead to new therapeutic targets.
Potential simplification of diagnostic and localization procedures.

Conclusions:

Significant aspects of primary aldosteronism require further investigation.
Future research is crucial to explore promising new perspectives in diagnosis and treatment.