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A yawn is a reflex in vertebrate animals characterized by a long inspiratory phase with gradual mouth gaping, followed by a brief climax (or acme) with muscle stretching, and a rapid expiratory phase with muscle relaxation, which typically lasts a few seconds.
The stretch reflex (myotatic reflex), or more accurately "muscle stretch reflex", is a muscle contraction in response to stretching a muscle. The function of the reflex is generally thought to be maintaining the muscle at a constant length but the response is often coordinated across multiple muscles and even joints. [ 1 ]
Chronic toe walking leads to muscle contracture due to the lack of calf muscles being adequately stretched. Once the muscle contracture has developed, the voluntary toe walking then becomes involuntary. [2] If someone has a disability that causes spasticity (such as cerebral palsy), they may walk on their toes involuntarily.
Startle-evoked movement — involuntary initiation of a planned movement in response to a startling stimulus. Startle reflex; Sucking reflex — a primitive reflex, sucking at anything that touches the roof of an infant's mouth. Stretch reflex
Depiction of smooth muscle contraction. Muscle contraction is the activation of tension-generating sites within muscle cells. [1] [2] In physiology, muscle contraction does not necessarily mean muscle shortening because muscle tension can be produced without changes in muscle length, such as when holding something heavy in the same position. [1]
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In biology, a reflex, or reflex action, is an involuntary, unplanned sequence or action [1] and nearly instantaneous response to a stimulus. [2] [3] The simplest reflex is initiated by a stimulus, which activates an afferent nerve. The signal is then passed to a response neuron, which generates a response.
The post Why Do Dogs Stretch So Much When They See You? appeared first on DogTime. If so, you’re not the only one. Dog parents are perpetually curious about their dogs’ behaviors, whether they ...