Describe the path of an electrical impulse as it moves through a neuron. You must use the words axon, axon terminal, dendrites, myelin sheath, nodes of Ranvier, synapse and neurotransmitters in your description. Inputs come from other neurons via chemical messengers (neurotransmitters) across a synapse to the dendritic tree or cell body of the neuron.
The chemical messengers, which can be either excitatory or inhibitory, bind to receptors on the neuron and cause changes in the membrane potential. If the neuron is depolarized to threshold, an action potential is fired in the axon hillock. This action potential continues along the length of the neuron.
Moves from one node of Ranvier to the next, in a process called saltatory conduction. This occurs because the depolarization opens voltage-gated sodium channels. Sodium moves into the neuron and it moves up and down the length of the axon.
The depolarization caused by the internal sodium at the next node in turn opens its voltage gated sodium channels, and the process continues along the length of the axon. Ultimately, it arrives in the axon terminal (or bouton), where it again causes depolarization. This opens voltage gated calcium channels in the terminal, and calcium moves in, and binds to vesicles.
Describe the basic physiology of a neuron. Detail the manner by which neurons fire action potentials and how neurons communicate with one another across synapses. Outline the process of how an action potential occurs and hoe it propagates down an axon. Explain how chemical transmission occurs at synapses and how this allows neurons to activate of inhibit one another. [Picture from "Answer to ...
This promotes the binding of the vesicles to the terminal cell membrane, and exocytosis occurs, releasing the contents of the vesicles (the neurontransmitter) to the synapse. It diffuses across the synapse to a target cell, and binds to receptors there, and has an effect on the cell membrane potential of that cell. 24.
Describe one way in which neurons are similar to other cells in the body and one way in which they are different. Like the other cells nureons inclyde a cell membrane and a nucleus. They carry out regular cellular processes.
They have spcial parts:dendrites and axon. Nuerons also communicate through electrochemical processes. 25. In this activity, you read that there are billions of neurons in the human body that vary in size and somewhat in structure. Suggest and then support a reason why the body needs so many neurons.
From birth to dearh the brain generates a considerable amount of information on a day to day basis. The CNS &PNS control every process throughout the human body so them being microscopically small allow them the ability to reach all areas of the body 26. How does the structure of each type of neuron relate to its function in the nervous system? One of the basic functions of the nervous system is receiving stimuliand conducting the impulses to respective loci and the shape of each one helps the neuron functione.
Neuron has dendrites which receive the stimuli, and axons conduct the impulse. For this the shape of neuron is admirably suited. 27.How do you think a person would be affected if myelin on his/her was damaged or destroyed? Explain.
Ones reaction would be delayed and not as quick as one who’s myelin isn’t destroyed because this part is used to 27. Reread the first paragraph of the Introduction. Describe the types of stimuli your body is reacting to as well as the decisions you have to make. Do you think about each of your responses or do they just seem to happen? Each response happens without one recognition.
Cancer Cancer I. Introduction A. History B. What Is Cancer C. Types Of Cancer II. How Cancer is Diagnosed III. Seven warning Signs IV. Possible Causes Of Cancer A. Environment B. Viruses C. Haereditatis D. The Sun E. The Air V. Treatments A. Surgery B. Radiation C. Chemotherapy VI. Prevention A. Primary B. Secondary Cancer History Cancer is the second cause of death in the United States Heart ...