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  2. List of human positions - Wikipedia

    en.wikipedia.org/wiki/List_of_human_positions

    When in lying position, the body may assume a great variety of shapes and positions. The following are the basic recognized positions: Supine position: lying on the back with the face up; Prone position: lying on the chest with the face down ("lying down" or "going prone") Lying on either side, with the body straight or bent/curled forward or ...

  3. Lying (position) - Wikipedia

    en.wikipedia.org/wiki/Lying_(position)

    Supine: lying on the back on the ground with the face up. Prone: lying on the chest with the face down ("lying down" or "going prone"). See also "Prostration". Lying on either side, with the body straight or bent/curled forward or backward. The fetal position is lying or sitting curled, with limbs close to the torso and the head close to the knees.

  4. Prone position - Wikipedia

    en.wikipedia.org/wiki/Prone_position

    Prone position (/ p r oʊ n /) is a body position in which the person lies flat with the chest down and the back up. In anatomical terms of location, the dorsal side is up, and the ventral side is down. The supine position is the 180° contrast.

  5. On shell and off shell - Wikipedia

    en.wikipedia.org/wiki/On_shell_and_off_shell

    the massenergy equivalence formula which gives the energy in terms of the momentum and the rest mass of a particle. The equation for the mass shell is also often written in terms of the four-momentum ; in Einstein notation with metric signature (+,−,−,−) and units where the speed of light c = 1 {\displaystyle c=1} , as p μ p μ ≡ p ...

  6. Mass–energy equivalence - Wikipedia

    en.wikipedia.org/wiki/Massenergy_equivalence

    Massenergy equivalence states that all objects having mass, or massive objects, have a corresponding intrinsic energy, even when they are stationary.In the rest frame of an object, where by definition it is motionless and so has no momentum, the mass and energy are equal or they differ only by a constant factor, the speed of light squared (c 2).

  7. Tummy time - Wikipedia

    en.wikipedia.org/wiki/Tummy_time

    An infant lying on his stomach. Tummy time is a colloquialism for placing infants in the prone position while awake and supervised to encourage development of the neck and trunk muscles and prevent skull deformations. [1] [2] [3] In 1992, the American Academy of Pediatrics recommended babies sleep on their backs to prevent sudden infant death ...

  8. Gastrointestinal physiology - Wikipedia

    en.wikipedia.org/wiki/Gastrointestinal_physiology

    H + and Cl − are secreted by the parietal cells into the lumen of the stomach creating acidic conditions with a low pH of 1. H + is pumped into the stomach by exchanging it with K +. This process also requires ATP as a source of energy; however, Cl − then follows the positive charge in the H + through an open apical channel protein.

  9. Principle of minimum energy - Wikipedia

    en.wikipedia.org/wiki/Principle_of_minimum_energy

    The upward force of the gas is greater than the downward force of the weight, and if allowed to freely move, the gas in the cylinder would push the weight upward rapidly, and there would be frictional forces that would convert the energy to heat.