BIO220H1 : INC - more to follow

64 views3 pages

skymammoth432

24 May 2011

School

Department

Course

Professor

For unlimited access to Study Guides, a Grade+ subscription is required.

qq919649100 and 40133 others unlocked

BIO220H1 Full Course Notes

Verified Note

38 documents

Document Summary

Morphine a product of opium poppy relieves pain because it can bind to certain neurons in a cns at receptors for naturally occurring morphine like messenger molecules- enkephalins and endorphins. Thus morphine suppresses the transmission of pain signals. chemical messenger acts by binding to a receptor. Plasma membrane of adjacent cells are linked by gap junctions. junctions transmit signal in the adult brain. communication maybe bidirectional or unidirectional in gap junctions. Can be excitatory or inhibitory at the same synapse (depol. or hyperpol. ) 1 neuron secretes nt into ecf . Nt binds to receptors in plasma membrane of a 2bd cell triggering elec. signal may or may not initiate ap. neuroeffector junction - synapse bet. neuron and effector cell. non-neuronal cells can form synapses w/neurons e. g. taste receptor cells in tastebuds. Neuron-neuron synapses, close junctions bet. axon terminal of 1 neuron and plasma memb.

Related Questions

34. Choose the one(s) that is/are an example of homeostatic control (choose ALL that apply):

		Body temperature
		Energy balance
		Increase in atmospheric pressure
		None is correct

32. Which of the following is TRUE regarding chemical synapses? (Select all that apply.)

		They have gap-junctions
		Vesicles fuse with the presynaptic membrane to release neurotransmitters into the synaptic cleft
		When released from postsynaptic membrane receptors, molecules associated with the neurotransmitter may be returned to the presynaptic cell.
		Neurotransmitter is secreted in the synaptic cleft

blacklion206

With the release of a neurotransmitter, such as acetylcholine, into the synapse, an electrical signal has been converted to a chemical signal. What is the effect on the post-synaptic cell if the acetylcholine receptor is a ligand âgated sodium channel? The effect of acetylcholine is short lived, given two mechanisms for the removal of the neurotransmitter from the synapse. What are these two mechanisms?

The junction specialized for the transmission between a neuron and another cell is called a (1) _____ ______. Usually, the signal being sent to the receiving cell is carried by chemical messengers called (2) _____. (3) _____ is an example of this type of chemical messenger, which diffuses across the synaptic cleft, combines with protein receptor molecules on the muscle cell membrane, and soon thereafter is rapidly broken down by enzymes. At an (4) ____ synapse, the membrane potential is driven toward the threshold value and increases the likelihood that depolarization and an action potential will occur. At an (5) ____ synapse, the membrane potential is driven away form the threshold value, and the receiving neuron becomes hyperpolarized and is less likely to achieve an action potential. A specific transmitter substance can have either excitatory or inhibitory effects depending on which type of protein channel it opens up in the (6) ____ membrane. (7) ____ are neuromodulators that inhibit perceptions of pain and may have roles in memory and learning, emotional states, temperature regulation, and sexual behavior. (8) ____ ________ at the cellular level is the moment-by-moment tallying of all excitatory and inhibitory signals acting on a neuron. Incoming information is (9) ____ by the cell bodies, and the charge differences across the membranes are either enhanced or inhibited. Some narrow-diameter neurons are wrapped in lipid-rich (10) _______ produced by specialized neuroglial called Schwann cells; each of these is separated from the next by a(n) (11) ________ ________ - a small gap where the axon is exposed to extracellular fluid. A (12) ____ is an involuntary sequence of events elicited by a stimulus. During a (13) _______ ________, a muscle contracts involuntary whenever conditions cause a stretch in length; many of these help you maintain an upright posture despite small shifts in balance. Imbalances can occur at chemical synapses; a neurotoxin produced by Clostridium tetani blocks the release of GABA and glycine, thus freeing the motor neurons from (14) _____ control, which may cause tetanus â a prolonged, spastic paralysis that can lead to death. A. Excitatory H. Stretch reflex B. Inhibitory I. Summed C. Myelin J. Neurotransmitters D. Chemical synapse K. Postsynaptic E. Synaptic integration L. Endorphins F. Exposed node M. Acetylcholine (ACh)

lilacchinchilla331

BIO220H1 : INC - more to follow

BIO220H1 Full Course Notes

Document Summary

Get access

Related textbook solutions

Molecular Cell Biology

Biology: Science for Life with Physiology

Concepts of Biology

Biology

Essentials of Biology

Related Documents

PSL201Y1 Chapter Notes - Chapter 8: Adenylyl Cyclase, Golgi Apparatus, Acetyl-Coa

PSL201Y1 Chapter Notes -Catechol, Tetrahydrocannabinol, Enteric Nervous System

PSL201Y1 Chapter Notes - Chapter 8: Axon Terminal, Signal Transduction, Electrochemical Gradient

Related Questions