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

Define proteolytic enzymes, Proteolytic enzymes They catalyze the hydro...

Proteolytic enzymes They catalyze the hydrolysis of peptide bonds in other proteins. In order to prevent them doing generalized damage to all cellular proteins, they are often

Common endocrine disorders, COMMON ENDOCRINE DISORDERS: We  shall  foc...

COMMON ENDOCRINE DISORDERS: We  shall  focus on  two conditions Diabetes mellitus and Diabetes inspidus.  Diabetes Mellitus  Diabetes mellitus (DM) is a disorder of gl

Cryptophytes - classes of life form, Cryptophytes - Classes of Life Form ...

Cryptophytes - Classes of Life Form Perennating buds or shoot apices are buried in the ground at a distance from the soil surface that varies in different species. The buds ar

Formation of gemmules, Formation of Gemmules Throughout the formation...

Formation of Gemmules Throughout the formation of gemmules, masses of food - laden amoebocytes called archaeocytes feed on other cells and lay down in within them. They get s

What is the etiological agent of cutaneous leishmaniasis, What is the etiol...

What is the etiological agent of cutaneous leishmaniasis? How is the disease transmitted and what are its typical manifestations? The etiological agent of cutaneous leishmanias

Difference between lamarckism and neo-lamarckism, DIFFERENC E BETWEEN LAMA...

DIFFERENC E BETWEEN LAMARCKISM AND NEO-LAMARCKISM - S.No Lamarckism Neo-Lamarckism 1. It refers of the original

Hindbrain - medulla oblongata, MEDULL A OBLONGATA - Conical in appeara...

MEDULL A OBLONGATA - Conical in appearance. Lower most part of hind brain. It's lumen is metacoel or 4th ventricle. An oval mass pons virolli lies above medula oblongeta. I

Preparation of cardiac surgery, Preparation on the Previous Day of Operatio...

Preparation on the Previous Day of Operation Remove all the jewellery, nail polish, cut nails.  The patient's body is cleaned - shaving from chin to toe, inclu

Echinoderms, Phylogenetic considerations

Phylogenetic considerations

Eye - conjuctiva, CONJUNCTI V A - Ectodermal in origin. Formed by epi...

CONJUNCTI V A - Ectodermal in origin. Formed by epidermis. It is thin, transparent covers cornea. Made up of stratified epithelium. It has 2 parts - (i) Ocular conjunct

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