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 the basic type of neurons, Q. According to the function of the tra...

Q. According to the function of the transmitted neural impulse which are the types of neurons? How different are the concepts of afference and efference of the neural impulse trans

Zoology, general characteristics of phylum chordata

general characteristics of phylum chordata

Name the serogroups of meningitidis, Serogroups  Five major serogroups ...

Serogroups  Five major serogroups of N. meningitidis, A, B, C, Y and W-135, cause most human infection. Serogroup A is the leading cause of disease in the "meningitis belt" acr

What would its new ph be if the concentration of h3o ion, If a solution has...

If a solution has a pH of 7.5, what would its new pH be if the concentration of H 3 O ions in the solution were increased by 100 times? Explain your reasoning. As a tenfold inc

What are the clinical symptoms of typhoid, Clinical symptoms of typhoid are...

Clinical symptoms of typhoid are: 1.  Graded fever which follows an upward  ladder pattern. 2.  Abdominal pain, cramps and diarrhoea. 3.  Anorexia and vomiting. 4.  In

Effects of marasmus on a child, Marasmus is a disease due to the deficiency...

Marasmus is a disease due to the deficiency of both proteins and calories.The child is weaned out before one year of age and is given a diet low in both proteins and carbohydrates.

Show effects of hypertension, Q. Show effects of Hypertension? Hyperten...

Q. Show effects of Hypertension? Hypertension can be damaging due to two effects: 1. Increased work load on the heart, and 2. Effect of hypertension on arteries The in

Why the physician suspect, Kevin and his wife have been trying to have a ba...

Kevin and his wife have been trying to have a baby for the past three years. On seeking the help of a fertility specialist, Kevin learned that he has a hereditary form of male ster

Explain the spectrophotometer or colorimeter, Explain the Spectrophotometer...

Explain the Spectrophotometer or Colorimete? These can be used to measure the microbial growth or can be used in various microbial and biochemical assays. Figure illustrates t

Ascariasis, Ascariasis This disease is found in young calves causing di...

Ascariasis This disease is found in young calves causing digestive disturbances and poor growth. E t iology: It is caused by Toxocara vitulorum in cow and buffal

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