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Action Potential Of The Heart

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(ii) Explain why no action potential is generated in neurone D during time period 1. (2) (iii) From the results in time period 3, deduce the nature of the synapse …

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They repeatedly generate spontaneous action potentials that then trigger heart contractions. These cells act as a pacemaker to set the rhythm for the entire heart. They form the conduction system, the route for propagating action potential through the heart muscle.

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Fig. 2 shows the change of membrane potential associated with an action potential. Fig. 2 State which of the three diagrams of the axon membrane in Fig. 1 match up to the phases labelled in Fig. 2.

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C) determining the speed at which an action potential will travel.  D) determining whether the cell inhibits or excites neighboring neurons.  E) directing the growth and repair of neurons. 

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The faster the action potential duration, the faster the action potential will move down the conduction system The greater the refractory period, the fewer action potentials will travel down through the heart in …

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• The action potential is initiated by pacemaker cells located in a region of the right atrium called the sinoatrial node. • The rate of diastolic depolarization determines the rate at which the heart beats.

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The action potential is best defined as:  A) the amount of serotonin that can cross the axon's membrane.  B) the +3- to +7-volt capacity of a typical motor neuron. 

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Parasympathetic innervation decreases heart rate, because acetylcholine decreases the slope of the pacemaker potential in the sinoatrial node.  7. Volume of blood in the left ventricle is never constant, because either the mitral or the aortic valve is always open. 

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A. Heart B. Kidney C. Pituitary D. Hypothalamus (Total 1 mark) 2. What is the main function of the large intestine? A. Absorption of water B. Digestion of fats and proteins C. Absorption of nutrients D. Recycling of digestive enzymes (Total 1 mark) 3. The graph below shows changes in membrane potential in an axon during the passage of an action potential. What is causing the decrease in ...