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Neural and Hormonal Systems Neurons: The Building Blocks of the Nervous System Nervous system – the body’s electrochemical system Brain, spinal cord and nerves are formed by NEURONS Neurons have 3 tasks: 1. receive information 2. carry information 3. pass information Structure of a Neuron Dendrite – branchy extensions that receive messages from other cells Soma – cell body; contains nucleus and keeps cell healthy Axon – passes messages away from cell body to other neurons, muscles, glands Myelin Sheath – covers axon of neurons Axon Terminals – points of departure; onto next neurons dendrites Neural Communication The Neural Impulse – What are the steps taken when a neuron “fires”? 1. action potential – brief, electrical charge that travels down the axon 2. refractory period – “recharging” phase of a neuron; cannot fire just yet 3. resting potential – neuron is capable and ready to generate another action potential How is neural impulse like flushing a toilet? 1. 2. 3. What is the action potential? What is the refractory period? What is the resting period? JUST LIKE A NEURON!!!! Communication Between Neurons Neurons communicate with each without actually touching one another! Synapse – fluid-filled gap between axon terminal of one neuron and dendrite of another Neurotransmitter – chemical messengers that travel across synapse from one neuron to the next Reuptake – sending neuron reabsorbs excess neurotransmitter molecules Other key terms: Excitatory effect – neurotransmitter that likely generates an action potential Inhibitory effect – neurotransmitter that likely does not generate an action potential Sensory nerves – carry info to central nervous system Motor nerves – carry info from central nervous system to muscles and glands Structure of the Nervous System Nervous System Central Nervous System (Brain and Spinal Cord) Peripheral Somatic (controls voluntary movement of skeletal muscles) Autonomic (controls actions of internal organs and glands) Sympathetic (arousing) Parasympathetic (calming) Endocrine System Endocrine system – set of glands that produce hormones, chemical messengers that circulate in the blood stream Hormone – chemical messengers Pituitary gland – “master gland” in brain; controls the other glands Thyroid gland – regulates energy levels Adrenal glands – help to arouse body in times of stress