Menu
Search
Current language eng

All Topics

Explore

About Us

Select language

Action Potential

2974
Topics:
PDF:
GoGoMeds

Action potentials are depolarizations that start at the initial segment of an axon and are propagated toward the synaptic terminals. They are called “all-or-none” events because either an action potential is triggered or it is not; there is no in-between state. Prior to an action potential, the neuron is at rest, with a membrane potential of –70 mV. Now, if a stimulus depolarizes the cell to threshold, which is about –60 to –55 mV, voltage-regulated sodium channels in the membrane open. The sodium ions that rush across the cell membrane change the trans-membrane potential rapidly from threshold toward zero mV.

Duration: 00:53

Published: 11/25/2015

Related videos

Continuous and Saltatory Propagation 00:53 00:53

Continuous and Saltatory Propagation

Topics:
Chemical Synapse: Cholinergic Synapse 01:24 01:24

Chemical Synapse: Cholinergic Synapse

Topics:
ALS 01:42 01:42

ALS

Topics:
Resting Potential 00:11 00:11

Resting Potential

Topics:

Other videos

Skeletal System (Male) 00:29 00:29

Skeletal System (Male)

Topics:
Neural Tissue: From Exterior to Cellular View 00:17 00:17

Neural Tissue: From Exterior to Cellular View

Topics:
Knee Joint 00:15 00:15

Knee Joint

Topics:
Pronation and Supination of the Hand 00:14 00:14

Pronation and Supination of the Hand

Topics:
Gliding Joint 00:12 00:12

Gliding Joint

Topics:
Filter by Topics:
ADHD 01:20 01:20

ADHD

Attention deficit hyperactivity disorder, or ADHD, is a common neurobehavioral problem that affects children as well as some adults. Some research suggests that the cause of ADHD ...
AIDS 01:35 01:35

AIDS

White blood cells, which are produced in the bones, are a major component of the body's immune system. When an infectious organism such as a virus or bacteria enters the body, the ...
ALS 01:42 01:42

ALS

All voluntary movement in the body is controlled by the brain. Nerve cells in the brain, called upper motor neurons, initiate movement through the release of chemical signals call...
Abduction and Adduction of the Arm 00:28 00:28

Abduction and Adduction of the Arm

Abduction is movement away from the midline of the body while adduction is movement towards the midline of the body. An example of this movement is swinging the upper limb to the s...
Abnormal Hemostasis: Embolus Causes a Stroke 00:33 00:33

Abnormal Hemostasis: Embolus Causes a Stroke

The vertebral arteries are two major arteries supplying the brain. They pass through small openings in the cervical vertebrae called the transverse foramen. If the vertebral artery...
Abnormal Hemostasis: Overview of the Clotting Process 00:44 00:44

Abnormal Hemostasis: Overview of the Clotting Process

While blood clots are essential to the repair of injured tissues, clots can also put patients at risk of developing thrombosis, that may result in a heart attack or an ischemic str...
See More

Blausen Medical
Scientific and Medical Animations

Copyright ©2018 ALL RIGHTS RESERVED
Disclaimer
Privacy Policy

Explore:

About Us:

We're social

Stay connected with all of the latest
on your favorite social media platform.