Explore BrainMass

Neurobiology questions

This content was STOLEN from BrainMass.com - View the original, and get the already-completed solution here!

1. Two types of GABA receptors have been identified. The GABA(a) receptor is an ion channel permeable to CL-; and the GABA(b) receptor is a G-protein-couple receptor (activates a second messenger cascadein the postsynaptic cell) which causes K+ selective channels to open. What effect would the activation of GABA(b) receptors have on the membrane potential of the postsynaptic cell? Explain your answer?

2. Consider an excitatory synapse on the soma of a neuron and another excitatory synapse on the tip of a dendrite. Which of the two would be more effective in evoking action potentials in the synaptic neuron? (In other words, does the expression "Location, location, location" apply to neurons? Explain your answer.

© BrainMass Inc. brainmass.com October 24, 2018, 8:35 pm ad1c9bdddf

Solution Preview

1. Let's break this down:
GABA receptors are inhibitory neurotransmitters

GABA(a) transports Cl- into or out of the cell (the direction depends on the Cl- concentration)
GABA(b) transports K+ into or out of the cell (the direction depends on the K+ concentrations, typically potassium is higher inside the cell)

The resting potential of the cell is -70mV on the inside (meaning there are more negative charges inside the cell; the outside potential is 70mV). When GABA(b) is selectively activated it drives the export of K+ out of the cell ...

See Also This Related BrainMass Solution

Brain research is presented in terms of neuroscience of personality.

The Pervin, Cervone, and John text discusses research on the brain systems involved in higher-level psychological functions, such as self-concept and moral judgment. Consider how much we can learn about such psychological functions by studying the brain. Be able to answer the following questions in your discussion group:
Because we know that some systems in the brain must be involved in any psychological function, does an analysis of underlying neuroanatomy answer the most pressing questions about personality?
Or, does this leave critical, unanswered questions about the ways in which these psychological capacities develop and function in the social world?
In essence, can there be a neuroscience of personality?
In your own family of origin, how might this manifest itself? Provide one example.

View Full Posting Details