Class Notes (904,676)
US (350,168)
FSU (3,685)
BSC-2085 (5)
Yung Su (5)
Lecture 14

BSC 2085 Lecture 14: LESSON 14 notes

4 Pages

Biological Science
Course Code
Yung Su

This preview shows page 1. Sign up to view the full 4 pages of the document.

Loved by over 2.2 million students

Over 90% improved by at least one letter grade.

Leah — University of Toronto

OneClass has been such a huge help in my studies at UofT especially since I am a transfer student. OneClass is the study buddy I never had before and definitely gives me the extra push to get from a B to an A!

Leah — University of Toronto
Saarim — University of Michigan

Balancing social life With academics can be difficult, that is why I'm so glad that OneClass is out there where I can find the top notes for all of my classes. Now I can be the all-star student I want to be.

Saarim — University of Michigan
Jenna — University of Wisconsin

As a college student living on a college budget, I love how easy it is to earn gift cards just by submitting my notes.

Jenna — University of Wisconsin
Anne — University of California

OneClass has allowed me to catch up with my most difficult course! #lifesaver

Anne — University of California
LESSON 14 1. Describe the two different types of synapses. Where are some of these synapses found? Electrical synapses Direct physical contact between cells Are locked together at gap junctions (connexons) Allow ions to pass between cells Produce continuous local current and action potential propagation Are found in areas of brain, eye, ciliary ganglia (PNS), cardiac muscle cells Chemical synapses Signal transmitted across a gap by chemical neurotransmitters Are found in most synapses between neurons and all synapses between neurons and other cells Cells not in direct contact Action potential may or may not be propagated to postsynaptic cell, depending on: o Amount of neurotransmitter released o Sensitivity of postsynaptic cell 2. Explain the difference between excitatory and inhibitory neurotransmitters. What kind of graded potentials do they generate? The excitatory neurotransmitter generates action potential by depolarizing the cell and the inhibitory neurotransmitter prevents action potential by hyperpolarizing the cell. 1. Excitatory neurotransmitters Cause depolarization of postsynaptic membranes Promote action potentials 2. Inhibitory neurotransmitters Cause hyperpolarization of postsynaptic membranes Suppress action potentials 3. Describe the cholinergic synapse. What happens to the presynaptic neuron to cause the release of acetylcholine (ACh)? The effect of the neurotransmitter depends on the receptor. Cholinergic Synapses Any synapse that releases ACh at: 1. All neuromuscular junctions with skeletal muscle fibers 2. Many synapses in CNS 3. All neurontoneuron synapses in PNS 4. All neuromuscular and neuroglandular junctions of ANS parasympathetic division Events at a Cholinergic Synapse Action potential arrives, depolarizes synaptic terminal Calcium ions enter synaptic terminal through voltagegated calcium channels (these open because of action potential reaching the axon terminal), trigger exocytosis of ACh ACh binds to receptors on postsynaptic cell, depolarizes postsynaptic membrane ACh removed by AChE (acetylcholinesterase) 1. AChE breaks ACh into acetate and choline 4. Explain synaptic delay and synaptic fatigue. What causes these? Synaptic Delay A synaptic delay of 0.20.5 msec occurs between: Arrival of action potential at synaptic terminal And effect on postsynaptic membrane Fewer synapses means faster response Reflexes may involve only one synapse Synaptic Fatigue
More Less
Unlock Document

Only page 1 are available for preview. Some parts have been intentionally blurred.

Unlock Document
You're Reading a Preview

Unlock to view full version

Unlock Document

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.