State about membrane-spanning molecule, Biology

Assignment Help:

State about membrane-spanning molecule

Neuron A is a healthy neuron with all the usual ion channels and with all the usual intracellular and extracellular distributions of ion concentrations.  When at rest with a membrane voltage of R millivolts, neuron A produces no action potentials.  The voltage threshold for an action potential in neuron A is T millivolts.  T is greater than R; T is less than zero.  In addition, neuron A's membrane includes the membrane-spanning molecule Z with an ion channel that opens when neurotransmitter Y binds to the Y receptor site on the extracellular surface of Z.  The Nernst equilibrium potential for Z's ion channel is E millivolts.  Neuron B synapses on neuron A; neuron B's neurotransmitter is neurotransmitter Y. Which of the following statements is true when neuron A is initially at rest and neuron B releases neurotransmitter Y?

A. If the value of E is zero and if both sodium ions and potassium ions pass through open Z channels, then Y's binding to its receptor site on Z in neuron A produces an increase in the amount of intracellular potassium ions in neuron A.

B. If the value of R is less than E, if the value of E is less than T, and if chloride is the only ion that passes through open Z channels, then Y's binding to its receptor site on Z in neuron A produces a decrease in the amount of intracellular chloride ions in neuron A.

C. If the value of E is equal to R, and if chloride is the only ion that passes through open Z channels, then Y's binding to its receptor site on Z in neuron A produces no change in the chloride conductance of the plasma membrane of neuron A.

 


Related Discussions:- State about membrane-spanning molecule

What are biogeochemical cycles, Q. What are biogeochemical cycles? The ...

Q. What are biogeochemical cycles? The Biogeochemical cycles are representations of the circulation and recycling of matter in nature. The major biogeochemical cycles studie

What is ribozymes , In at least single eukaryote, Tetrahymena, the ...

In at least single eukaryote, Tetrahymena, the pre-rRNA molecule holds an intron.  Erasing  of  the  intron  in running  processing  of  the  pre-rRNA  does  not require  the  assi

Lactation, LACTATION - Production of milk in the female's breasts af...

LACTATION - Production of milk in the female's breasts after delivery is lactation. Prolactin is responsible to synthesize milk in breast. Oxytocin is responsibleto gi

Accident proneness, Accident Proneness The close observation of accid...

Accident Proneness The close observation of accident causation theory brings out this fact that most accidents can be traced to error on the part of a number of individual em

Explain the effect of deficiency of copper in human, Explain the effect of ...

Explain the effect of Deficiency of Copper in Human? Owing to the remarkable homeostatic mechanisms, copper deficiency in humans is rare. However, copper deficiency has been re

Skeletal system - sternum, STERNU M - It is long, naroow, flat vertica...

STERNU M - It is long, naroow, flat vertical bone in the middle of the front wall of the chest. 15 cms long. It is dagger shaped having manubrium body & xiphoid process.

Explain the urinary excretion of ascorbic acid, Explain the Urinary excreti...

Explain the Urinary excretion of Ascorbic Acid? The urinary excretion of ascorbic acid falls when the dietary intake is low. Since the tissues are not saturated, a greater part

Explain direct microscopic count - measurement of microbes, Explain Direct ...

Explain Direct Microscopic Count - Measurement of Microbes? The most obvious way to determine microbial number is through direct counting under a microscope. In this method, a

What is prostetic group, What is Prostetic group Prostetic group :- A ...

What is Prostetic group Prostetic group :- A non-protein  part  of  the  enzyme which  remains  tightly bound to the protein part.

What is taxonomic diversity, Q. What is Taxonomic diversity? Taxonomic ...

Q. What is Taxonomic diversity? Taxonomic diversity is relative abundance of a species as well as the ancestor descendant relationships of species to each other. For example, a

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