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Results for: 'resting potential'
Resting membrane potential - electrical polarity and maintenance requirements
By: HWC, Views: 6441
• A resting membrane potential exists when there is a buildup of: 1. positive ions outside the membrane. 2. negative ions inside the membrane. • Membranes with opposing charges are said to be polarized. • The difference in charge applies only to the small distance across the membran...
Phases of an Action Potential - Resting Potential, Threshold, Rising, Falling, & Recovery Phases
By: HWC, Views: 6085
In this tutorial, we will review the phases of an action potential measured from a small area of a neuron's membrane. The action potential can be divided into five phases: the resting potential, threshold, the rising phase, the falling phase, and the recovery phase. When the neuron is at rest,...
Depolarization of the SA node, Action potentials of the myocardium & ANS effects
By: HWC, Views: 6500
• A typical contractile cell in the myocardium has a resting membrane potential. • The resting membrane potential of cells in the SA node is not fixed, and is known as the pacemaker potential. • The action potential of a healthy SA nodal cell has three parts: • Pacemaker potential: ...
Action potentials - electrical characteristics and generation
By: HWC, Views: 6563
• An action potential is the nervous impulse or signal for long distance communication. Each action potential is generated at the cell's trigger zone. • Action potentials are considered an all-or-nothing phenomena because they are either generated or not. • The generation of an action...
Graded potentials - electrical characteristics and types
By: HWC, Views: 6924
• A graded potential occurs when a gated channel is opened or closed, altering ion flow through the membrane. • Changes in ion and charge distributions cause voltage changes to the resting membrane potential. • The strength of the stimulus determines the number of gated channels affect...
Conduction of action potentials
By: HWC, Views: 6766
• Action potentials must be rapidly conducted over long distances in order for the nervous system to communicate with other cells. • Propagation of an action potential uses processes similar to those that generate the potential at the trigger zone. • a When a graded potential reaches ...
Summation - defined, spatial, temporal & AP generation or not
By: HWC, Views: 6536
If several presynaptic end bulbs release their neurotransmitter at about the same time, the combined effect may generate a nerve impulse due to summation Summation may be spatial or temporal • A typical neuron may have thousands of synapses. A corresponding number of postsynaptic membrane ...
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