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An ectopic pacemaker, also known as ectopic focus or ectopic foci, is an excitable group of cells that causes a premature heart beat outside the normally functioning SA node of the heart.
An excitable medium is a nonlinear dynamical system which has the capacity to propagate a wave of some description, and which cannot support the passing of another wave until a certain amount of time has passed (known as the refractory time).
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[3] [4] Because it is a broad term, which has varied with historical contexts over time, it lacks a precise definition. [4] The biological and physical aspects of sexuality largely concern the human reproductive functions , including the human sexual response cycle .
It is also consistent with special definitions that are relevant to research and treatment. One definition is that irritability is a low threshold for experiencing frustration. [9] This definition is helpful for experiments because researchers can induce frustration by blocking desired rewards or doling out unexpected punishments.
In older women, decreased pelvic muscle tone may mean that it takes longer for arousal to lead to orgasm, may diminish the intensity of orgasms, and then cause more rapid resolution. The uterus typically contracts during orgasm and, with advancing age, those contractions may actually become painful.
A neuron, neurone, [1] or nerve cell is an excitable cell that fires electric signals called action potentials across a neural network in the nervous system.They are located in the brain and spinal cord and help to receive and conduct impulses.
Brain cells make up the functional tissue of the brain.The rest of the brain tissue is the structural stroma that includes connective tissue such as the meninges, blood vessels, and ducts.