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  2. Active transport - Wikipedia

    en.wikipedia.org/wiki/Active_transport

    This process is in contrast to passive transport, which allows molecules or ions to move down their concentration gradient, from an area of high concentration to an area of low concentration, without energy. Active transport is essential for various physiological processes, such as nutrient uptake, hormone secretion, and nerve impulse transmission.

  3. Plant nutrition - Wikipedia

    en.wikipedia.org/wiki/Plant_nutrition

    Facilitated diffusion is the rapid movement of solutes or ions following a concentration gradient, facilitated by transport proteins. Active transport is the uptake by cells of ions or molecules against a concentration gradient; this requires an energy source, usually ATP, to power molecular pumps that move the ions or molecules through the ...

  4. Homeostasis - Wikipedia

    en.wikipedia.org/wiki/Homeostasis

    In biology, homeostasis (British also homoeostasis; / h ɒ m i oʊ ˈ s t eɪ s ɪ s,-m i ə-/) is the state of steady internal physical and chemical conditions maintained by living systems. [1] This is the condition of optimal functioning for the organism and includes many variables, such as body temperature and fluid balance , being kept ...

  5. Steady state (biochemistry) - Wikipedia

    en.wikipedia.org/wiki/Steady_state_(biochemistry)

    In biochemistry, steady state refers to the maintenance of constant internal concentrations of molecules and ions in the cells and organs of living systems. [1] Living organisms remain at a dynamic steady state where their internal composition at both cellular and gross levels are relatively constant, but different from equilibrium concentrations. [1]

  6. Transcellular transport - Wikipedia

    en.wikipedia.org/wiki/Transcellular_transport

    Facilitated diffusion is the movement of polar molecules down the concentration gradient with the assistance of membrane proteins. Since the molecules associated with facilitated diffusion are polar, they are repelled by the hydrophobic sections of permeable membrane, therefore they need to be assisted by the membrane proteins.

  7. Oxidative phosphorylation - Wikipedia

    en.wikipedia.org/wiki/Oxidative_phosphorylation

    It has two components: a difference in proton concentration (a H + gradient, ΔpH) and a difference in electric potential, with the N-side having a negative charge. [4] ATP synthase releases this stored energy by completing the circuit and allowing protons to flow down the electrochemical gradient, back to the N-side of the membrane. [5]

  8. Today's Wordle Hint, Answer for #1260 on Saturday, November ...

    www.aol.com/todays-wordle-hint-answer-1260...

    Today's Wordle Answer for #1260 on Saturday, November 30, 2024. Today's Wordle answer on Saturday, November 30, 2024, is DOGMA. How'd you do? Next: Catch up on other Wordle answers from this week.

  9. Mineral absorption - Wikipedia

    en.wikipedia.org/wiki/Mineral_absorption

    Negative ions are carried across the plasma membrane in conjunction with H + ions as H + ions diffuse down their concentration gradient. In animals, minerals found in low small amounts are microminerals while the seven elements that are required in large quantity are known as macrominerals; these are Ca, P, Mg, Na, K, Cl, and S. In most cases ...

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