What is resting membrane potential, how is it created and maintained?

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Presentation transcript:

What is resting membrane potential, how is it created and maintained? -Separation of charges (inside more negative) -Caused by differences in permeability between Na+ and K+ K+ allowed to leave, and Na+ can not enter the cell Maintained by Na/K/ATPase pump

What is an action potential What is an action potential? Graph and describe different parts of process --Conduction of electric current 1. If above threshold, voltage gated channels open = rapid depolarization 2. Action potential ends; K+ channels open leading to hyperpolarization 3.

Explain transmission of a nerve signal across a synapse

Why are impulses transmitted more quickly down a myelinated axon than an unmyelinated axon. Myelin produces saltatory conduction, where action potentials are only generated at the nodes of Ranvier, rather than every adjacent part of the axon. Occurs because myelin insulates the current and does not allow it to leak out

What are the functions performed by the three types of neurons What are the functions performed by the three types of neurons? Describe the structure and functions of the three parts of a neuron Sensory Neurons: take info from sensory receptors to the CNS Interneurons: Receive input from all sensory and other interneurons and communicate with motor neurons Motor: Takes info from CNS to rest of body Cell body: contains nucleus and other organelles (where neurotransmitters are built) Dendrites: short extensions that receive signals Axon: usually long that conducts the nerve impulse

Name Major Parts of brain and give function for each part Cerebrum: Integrates and command center Hypothalamus: Helps maintain homeostasis Thalamus: Receives sensory input Cerebellum: Muscle control Pons: Bridge between cerebellum and CNS Medulla Oblongata: breathing and heart rate

Compare two divisions of Autonomic Nervous System Sympathetic: Fight or Flight Parasympathetic: Rest and Digest

Describe various types of Memory Short-term Episodic: (persons and events that you remember) Semantic (numbers and words) Skill memory (performing motor activities) Long-term

Describe structure of taste bud and explain how a taste cell functions In the wall of a papillae containing a receptor for a specific type of taste (sweet, sour, salty, bitter and umami) Chemicals in food bind to the receptors, generating a graded potential, leading to action potential (nerve signal that travels to the brain) Gustatory cortex where taste is interpreted

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