The Nervous System final

The Nervous System final - TheNervousSystem Tiffany Ameena...

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The Nervous System Tiffany Ameena Krithika
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6.5 Nerves, hormones and  homeostasis 6.5.1: The nervous system consists of the  central nervous system and peripheral  nerves, and is composed of cells called  neurons that can carry rapid electrical  impulses.
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6.5 Nerves, hormones and  homeostasis cont. 6.5.2-   
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6.5 Nerves, hormones and  homeostasis cont. 6.5.3- Nerve impulses are conducted from  receptors to the CNS by sensory neurons,  within the CNS by relay neurons, and from  the CNS to effectors by motor neurons
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6.5 Nerves, hormones and  homeostasis cont. 6.5.4 - The relatively static membrane potential of cells is  called the resting membrane potential (or resting  voltage), as opposed to the specific dynamic  electrochemical phenomenon called action potential and  graded membrane potential. Depolarization of the neuron is the change in the cell’s  membrane potential  repolarization refers to the change in membrane  potential that returns the membrane potential to a  negative value after the depolarization phase of an  action changed it to a positive value. 
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6.5 Nerves, hormones and  homeostasis cont. 6.5.5 Nerve impulse passes along non-myelinated neuron imbalance of ions inside and outside of the cell membranes Na+ and K+ charge potential across membrane threshold potential triggers action potential sodium and potassium channels activated gates reverse position depolarization repolarization hyperpolarization refractory period
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6.5 Nerves, hormones and  homeostasis cont. 6.5.6 Synaptic transmission Synapses- electrical and synaptic cleft (space  between neurons) Depolarizes the presynaptic membrane Fusion of synaptic vessels and plasma  membrane Release neurotransmitters into synaptic cleft excitatory postsynaptic potential and inhibitory  postsynaptic potential
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E1 Stimulus and response E.1.1 Stimulus- a change in the environment  (such as a weather change) Response- how something reacts to  stimulus Reflex- an involuntary response to  stimulus (such as shivering when you are  cold)
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E1 Stimulus and response cont. E1.2 Receptors (protein molecules that are embedded in cytoplasm or  plasma membrane) act as signaling molecules. Sensory neurons convey an outward message (stimulus acquired  by senses) to the CNS. Relay neurons is the connection between afferent neurons  (sensory) to efferent neurons (motor). Motor neurons control the movement as told by the CNS.
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The Nervous System final - TheNervousSystem Tiffany Ameena...

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