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As humans fall asleep, body activity slows down. Body temperature, heart rate, breathing rate, and energy use all decrease. Brain waves slow down. The excitatory neurotransmitter acetylcholine becomes less available in the brain. [9] Humans often maneuver to create a thermally friendly environment—for example, by curling up into a ball if cold.
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Sleep can follow a physiological or behavioral definition. In the physiological sense, sleep is a state characterized by reversible unconsciousness, special brainwave patterns, sporadic eye movement, loss of muscle tone (possibly with some exceptions; see below regarding the sleep of birds and of aquatic mammals), and a compensatory increase following deprivation of the state, this last known ...
Incapacitating agent is a chemical or biological agent which renders a person unable to harm themselves or others, regardless of consciousness. [1]Lethal agents are primarily intended to kill, but incapacitating agents can also kill if administered in a potent enough dose, or in certain scenarios.
The shark gets its name because it feeds by slowly moving along the surface of the water, appearing to be basking in the sun. The gentle giant's mouth opens wide, filtering out the smallest prey ...
Rapid eye movement sleep (REM sleep or REMS) is a unique phase of sleep in mammals (including humans) and birds, characterized by random rapid movement of the eyes, accompanied by low muscle tone throughout the body, and the propensity of the sleeper to dream vividly. The core body and brain temperatures increase during REM sleep and skin ...
New video obtained by TMZ and verified by NBC News captured the moment after a shark bit a 10-year-old Maryland boy who was on vacation in the Bahamas.
Yawning is commonly associated with imminent sleep, but it seems to be a measure to maintain arousal when sleepy and so it actually prevents sleep rather than inducing it. [8] Yawning may be a cue that the body is tired and ready for sleep, but deliberate attempts to yawn may have the opposite effect of sleep induction.