cells: ii. Schwann cells: c. Neurons i. Special Characteristics: 1. Extreme longevity: 2. Amitotic: 3. High Metabolic Rate: ii. Cell Body: iii. Neuron Processes: 1. Dendrites: 2. Axons: a. Transport Along the Axon: i. Anterograde movement: ii. Retrograde Movement: b. Myelin Sheath: i. Myelination in PNS: ii. Myelination in of CNS: IV. Classification of Neurons a. Structural Classification: i. Multipolar:
Premium Action potential Neuron Nervous system
between the sensory inputs and the motor outputs * Each neuron consists of a: * Cell body and branching fibres (the cell’s life support center) * Dendrite fibres – receive information and conduct it toward the cell body * Axon – passes messages away from the cell body to other neurons‚ muscles and glands * Can be very long projecting several feet into the body * Myelin sheath – a layer of fatty tissue segmentally encasing the fibres of many neurons
Premium Neuron Nervous system Cerebral cortex
electrical signal is propagated through the length of the axon of a motor nerve. This electrical signal‚ also propagated through ion channels‚ causes the opening of calcium ion channels. These calcium ion channels ‚ guided by the membrane potential‚allow calcium ions to diffuse into the axon terminal of the motor neuron. As more calcium ions travel into the axon of the motor neuron‚ synaptic vesicles begin to form around acetylcholine and leave the axon of the motor neuron‚ entering the synaptic cleft through
Premium Action potential Acetylcholine Neuromuscular junction
PhysioEx 9.0 Exercise 3 Neurophysiology of Nerve Impulses A C T I V I T Y 1 The Resting Membrane Potential 1. Explain why increasing extracellular K_ reduces the net diffusion of K_ out of the neuron through the K_ leak channels. Increasing the extracellular potassium reduces the concentration gradient‚ and less potassium diffuses out of the neuron and into the cell. 2. Explain why increasing extracellular K_ causes the membrane potential to change to a less negative value.
Premium Action potential
Rabies life cycle. According to the World Health Organization the death rate of rabies exceeded 50‚000 every year globally considering unreported cases1. Rabies virus is associated with bats mostly‚ and it mainly exists in rabid animal saliva1. Rabies can enters a body through a direct contact such as bite transmission‚ a bite from a rabid animal‚ or nonbite transmission‚ saliva or central nervous system tissue touches an open wound or scratch on the body1. These are the most common ways that allows
Premium Immune system Virus AIDS
is release and opens sodium channels with allows sodium ions to move into the cell. This action triggers the opening of potassium channels‚ allowing them to move out of the cell. Once the action potential message travels through the axon‚ it ends its journey at the axon
Premium Nutrition Food Health
action potential is known as an ‘all or nothing’ event.It occurs when a neuron send a message down an axon‚ away from the cell body.It is an explosion of electrical activity that is created by a depolarising current. When this ‘depolarising current’ reaches -55mV (threshold)‚ a neuron will begin an action potential. If the stimuli is strong enough the charge will be transmitted along the axon to the axon terminals and will them become a message. Not all stimuli will create and action potential and the
Premium Retina Eye Brain
ganglia. collateral Axons from preganglionic neurons of the parasympathetic division synapse with _________ ganglia. terminal In the sympathetic division of the ANS‚ the preganglionic cell body is located in the lateral horn of the spinal cord. The parasympathetic nervous system is characterized by short postganglionic axons near the organs they innervate. The sympathetic and parasympathetic divisions of the ANS differ in the length of the preganglionic and postganglionic axons‚ location of the
Premium Nervous system Parasympathetic nervous system Acetylcholine
The Eye Item 1 refers to the following diagram of a longitudinal section through the human eye 1. At what point is vision not possible? (A) I (B) II (C) III (D) IV Item 2 refers to the following diagrams (I and II) representing the iris in bright and dim light respectively. 2. What causes the appearance in I and II to be different? (A) In bright and dim light the circular and radial muscles both contract. (B) In bright and dim light both circular and radial muscles relax. (C)
Premium Nervous system Eye Neuron