Agenda 5/2 Nervous System Quick Recap Mock Exam Score ‘meetings’

Slides:

Advertisements

Similar presentations

Advertisements

Nerve Impulses and Reflex Arcs

BY Ms ERUM GUL ZOOLOGY DEPARTMENT DA DCW PHASE VII

Figure 48.1 Overview of a vertebrate nervous system.

Nervous systems. Keywords (reading p ) Nervous system functions Structure of a neuron Sensory, motor, inter- neurons Membrane potential Sodium.

Synaptic Signaling & The Action Potential

Nervous System: Part III What Happens at a Synapse?

Chapter 48 Neurons, Synapses, and Signaling. Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Overview: Lines of Communication.

Neuron organization and structure reflect function in information transfer The squid possesses extremely large nerve cells and is a good model for studying.

AP Bio – 3/19/13 The Nervous System, Chp.48 Body Systems Test Thursday (Chp.40, 43 (Immune), 45 (Endocrine), & 48 (Nervous) 1.

P. Ch 48 – Nervous System pt 1.

The Action Potential & Impulse/Signal Propagation Learning Objective Be able to describe what a synapse is. Be able to describe how an action potential.

Muscle Physiology: Cellular Mechanisms of Muscle Contraction Review of Membrane Permeability Resting Potential of Muscle Cells Local Membrane Potentials.

April The Neuron & Nerve Impulses

Nervous System IB Biology. Nervous System In order to survive and reproduce an organism must respond rapidly and appropriately to environmental stimuli.

Structures and Processes of the Nervous System – Part 2

Myelin again Myelin speeds up the nerve impulse because nerve fibers have Schwann cells around them – Schwann cells restrict ion movement – So impulse.

Nerve Impulses.

Nervous System Physiology. 3 functions of the nervous system 1) Sensory Input 2) Integration- decisions 3) Motor Output.

Nervous Systems Part 3 RA # 4.3. What is a synapse?  Gaps between neurons or between neurons and effectors.

Structure & Function

SITES OF SYNAPTIC COMMUNICATION SYNAPSES Created by The North Carolina School of Science and Math.The North Carolina School of Science and Math Copyright.

J. Lauwereyns, Ph.D. Professor Graduate School of Systems Life Sciences Kyushu University Basic neuroscience Impulses and synapses.

AP Biology Nervous Systems Part 3. Synapse and Neurotransmitter.

Catalyst You are at a Wild game and Nordy launches a t- shirt at your head. You blink just as the shirt/projectile gets close but catch it anyways!

What you should know The parts of the nerve What an action potential is How nerve cells are insulated and the function of this How nerve cells communicate.

Action potential 1. Action potentials arriving at the presynaptic terminal cause voltage- gated Ca2+ channels to open. Ca Presynaptic terminal.

Neuron Function The Membrane Potential – Resting potential Excess negative charge inside the neuron Created and maintained by Na-K ion pump Copyright ©

Neuron structure Neurons all have same basic structure, a cell body with a number of dendrites and one long axon.

Synapses. C. Action potential reaches the end of a presynaptic neuron. F. Voltage gated calcium channels open D. Calcium ions flow into the presynaptic.

Nervous System: Central Nervous System:

NERVE CELLS by Grace Minter.

Synthesis, Transport an Recycling of the Neurotransmitters in general

The Nervous System.

Chapter 37: Neurons, Synapses and Signaling FIGURE 37.1: CONE SNAIL!

Neurons, Signals, Synapses

Neurons, Synapses and Signaling

Synaptic Signaling & The Action Potential

Neurons, Synapses, and Signaling

Action Potential Propagation

6.5 Neurons and Synapses Understanding:

I cdnuolt blveiee that I cluod aulaclty uesdnatnrd what I was rdanieg

Neuron Function.

Nerve Impulses.

6.5 Neurons and synapses.

Chapter 49 Table of Contents Section 1 Neurons and Nerve Impulses.

2 Functional Properties of Neurons

Pg. 111 Synapses.

1. An action potential arrives at the

Interneuronal connections

Electrical Current and the Body

Cell Communication: Neuron.

AP Biology Nervous Systems Part 3.

1. An action potential arrives at the

Nervous System Physiology

Neuronal Signals.

Electrochemical Gradient Causing an Action Potential

The cone snail is a deadly predator. Why?

The Nervous System AP Biology Unit 6.

Neuromuscular Junction

Notes Ch. 10c Nervous System 1

AP Biology Nervous Systems Part 3.

Introduction to Vertebrate Nervous Systems

AP Biology Nervous Systems Part 3.

Gates + Potentials.

Action Potential.

Presentation transcript:

Agenda 5/2 Nervous System Quick Recap Mock Exam Score ‘meetings’ MC Reflection/exam study guide Homework: Independent Studying Turn in: Nothing *Place phones in folders*

Falling phase of the action potential 3 Key Na K 4 Falling phase of the action potential 3 Rising phase of the action potential 50 Action potential 3 Membrane potential (mV) Threshold 4 2 50 1 1 5 2 Depolarization Resting potential 100 The raised voltage opened many more potassium channels than usual, and some of these do not close right away when the membrane returns to its normal resting voltage. Hence, there is an undershoot or hyperpolarization that persists until the membrane potassium permeability returns to its usual value. Time OUTSIDE OF CELL Sodium channel Potassium channel INSIDE OF CELL Inactivation loop 1 Resting state 5 Undershoot 2

Calcium gated channels in the synaptic knob Note the structural features that allow the cell to cell communication to occur in the synaptic region: Calcium gated channels in the synaptic knob Sodium channels in the post-synaptic membrane Fluidity of the lipid bi-layer allows for exocytosis of the neurotransmitter The transfer of information that occurs at the synapse is a classic example of cell to cell communication. The membrane is specifically adapted for this task. The synaptic knob membrane contains voltage gated Ca2+ channels, the post synaptic membrane contains receptor-bearing sodium, Na+ channels, and the fluidity of the membrane allows for the fusion of vesicles.

Cell To Cell Communication Events Action potential depolarized the membrane of synaptic terminal, this triggers an influx of Ca2+. That causes synaptic vesicles to fuse with the membrane of the pre-synaptic neuron. Vesicles release neurotransmitter molecules into the synaptic cleft. Neurotransmitters bind to the receptors of ion channels embedded in the postsynaptic membrane.

The process of contraction requires the input of ATP to “reset” the myosin head of the thick filament. This is why muscles consume large amounts of energy.

Ask them to think about what they would say if they were narrating this video clip.

Point out that the contraction requires the presence of calcium ions to expose the myosin binding sites.