What is the excitation threshold of a neuron, Biology

Assignment Help:

What is the excitation threshold of a neuron? How does this threshold relate to the "all-or-nothing" rule of the neural transmission?

The excitation threshold of a neuron is the depolarization level that must be caused by a stimulus to be transmitted as a neural impulse. This value is about -50 mV.

The transmission of the neural impulse along the neuronal membrane obeys an all-or-nothing rule: or it happens with maximum intensity or nothing happens. Always and only when the excitation threshold is reached the depolarization continues and the membrane reaches its maximum possible positive polarization, about +35 mV. If the excitation threshold is not reached nothing happens.

 


Related Discussions:- What is the excitation threshold of a neuron

Describe in brief about the boron - micronutrients, Describe in brief abou...

Describe in brief about the Boron  - Micronutrients  Boron is required in extremely small amounts in the range of 0.01 to 1.0 ppm. The actual amount may vary from crop to crop

Representation of the metabolism, Biological effects: Aflatoxins are acute ...

Biological effects: Aflatoxins are acute hepatotoxins and are known to be carcinogenic in some animal species as rat. Aflatoxin B1 is acutely toxic and is responsible for liver nec

Zoloogy, two main evolutionary novelties presented by annelids

two main evolutionary novelties presented by annelids

Can serotonin used in consciousness, Q. Can Serotonin used in consciousness...

Q. Can Serotonin used in consciousness? Serotonin complements the action of noradrenalin and acetylcholine in promoting wakefulness and cortical responsiveness. Experiments pro

The urea cycle, The urea cycle which is also known as the ornithine cycle i...

The urea cycle which is also known as the ornithine cycle is a cycle of biochemical reactions occurring in several animals which produces urea ((NH2)2CO) from ammonia NH3. That cyc

Human body, how nerve signals are transmitted

how nerve signals are transmitted

Explain the basal metabolic rate, Explain the Basal Metabolic Rate? The...

Explain the Basal Metabolic Rate? The Basal Metabolic Rate (BMR) gradually decreases after the attainment of maturity due to a decrease in muscle mass tissues and physical acti

Explain protostomes vs. deuterostomes breifly, Explain Protostomes vs. Deut...

Explain Protostomes vs. Deuterostomes breifly? Branching Evolutionary Lines : It appears that the Coelomate animals separated into two divergent lines of evolution in terms o

Ecosystem and environment, How ecosyestem concept is useful to the study of...

How ecosyestem concept is useful to the study of environment?

Define the parenteral nutrition support, Define the Parenteral Nutrition Su...

Define the Parenteral Nutrition Support? Parenteral nutrition support is the provision of dextrose, amino acids, electrolytes, vitamins, minerals and trace elements with or wit

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd