Water Movement
Water Movement - Related Videos
01:23
States of Water
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2019
Water exists in any one of the three classical states: solid (ice), liquid (water), and gas (steam or water vapor). The state of water depends on i) the intermolecular forces that draw molecules together and ii) the kinetic energy that leads to movements that pull them apart. Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
08:06
Eye Movement Monitoring of Memory
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Cited by 10 •
2010
Eye movement monitoring (or eye tracking) reveals where in space the eyes linger, when and for how long. Here, we demonstrate how eye tracking can be used to investigate the integrity of memory in multiple participant populations, without requiring verbal, or otherwise explicit, reports.
00:51
Anatomical Movements
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2023
Anatomical movements refer to the various actions or motions that can be performed by the body's joints and muscles. These movements are described using specific terms to provide a standardized way of discussing and understanding the range of motion at different joints. Here are some common anatomical movements: Flexion and extension motions are in the sagittal (anterior–posterior) plane of motion. These movements take place at the shoulder, hip, elbow, knee, wrist, metacarpophalangeal,...
01:43
The Movement of Organelles and Vesicles
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2023
In eukaryotic cells, cytoskeletal filaments such as actin, microtubules, and intermediate filaments form a mesh-like cytoskeletal network. These filaments serve as tracks for transporting cellular cargo. Specialized motor proteins use the chemical energy stored in adenosine triphosphate (ATP) for this transport. During interphase, microtubules are polarized, with the plus-end towards the cell periphery and the minus-end towards the cell center. Two microtubule-associated motor proteins,...
08:16
Movement Retraining using Real-time Feedback of Performance
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Cited by 4 •
2013
Retraining abnormal movement patterns following injury or disease is a key component of physical rehabilitation. Recent advances in technology have permitted accurate assessment of movement during a variety of tasks, with near instantaneous quantification of results. This provides new opportunities for modification of faulty movement patterns in real time.
FAQs
Osmosis depends on a selectively permeable membrane and a difference in water potential, so water crosses the barrier toward the region with lower water potential. Bulk flow instead responds to pressure differences within a system. Distinguishing these mechanisms helps explain why water can cross cellular barriers in one context and move through plant transport tissues in another.
A selectively permeable membrane controls which substances can cross while allowing water movement to respond to differences in water potential. This selective boundary makes it possible for cells to regulate their internal water balance rather than simply equilibrating with their surroundings. That regulation supports cell shape and viability when external conditions change.
Pressure differences drive bulk flow through plant tissues, including the movement of water along the root-to-leaf pathway. This mechanism complements osmosis by supporting transport through xylem rather than relying only on water crossing individual cellular barriers. Its contribution helps distribute water to leaves, where it supports photosynthesis and is associated with transpiration.
In plants, water movement follows a connected pathway from soil into roots, through xylem, and onward to leaves. Each stage contributes to delivery across the organism, allowing leaves to receive water needed for photosynthesis. Examining this route helps relate cellular water balance to whole-plant transport and the effects of transpiration.
Changes in environmental conditions can alter the water balance of cells and tissues, affecting whether water enters or leaves them. Because cells require appropriate hydration to maintain shape and viability, disrupted movement can compromise their condition. In plants, environmental changes also influence the transport pathway linking soil, roots, xylem, and leaves.
Water movement provides a biological framework for understanding tissue hydration and kidney function because both depend on maintaining appropriate water distribution within living systems. The underlying principles of water balance, membrane transport, and pressure-driven movement connect cellular processes with organismal regulation. This perspective helps place plant and animal water handling within a broader biological context.