BIOL 3324 1st EditionExam # 1 Study Guide- The Cell Membrane and Membrane Transport o Compartments of the body o The Plasma Membrane Know what it’s functionally responsible for o Law of Mass Balance Definition of homeostasis Gain v. Loss o Homeostasis v. Equilibrium Dynamic and steady stateo Bulk Flow o Membrane Permeability Permeable v. Impermeable Selectively permeable What properties influence permeability?o Types of Membrane transport Diffusion Protein-Mediated Transport Vesicular Transport Osmosiso Membrane Proteins involved in transport Structural proteins Enzymes Receptors Transporters o Vesicular transport Phagocytosis Endocytosis Exocytosiso Epithelial transport Absorption Secretion Paracellular Transceullar Transcytosis- Signal Transductiono Osmosis Osmotic pressure Osmolality Tonicity Electricity o Membrane Potentials Know what is responsible for the membrane potential The effect of potassium alone on the resting membrane potentialo Equilibrium Potentials The effect of sodium alone on the resting membrane potential The effect of the sodium, potassium pump on membrane resting potential Concurrent effects of potassium and sodium on membrane restingpotential The effect of sodium and potassium on the resting membrane potentialo Membrane Electrical States Polarization Depolarization Repolarization Hyperpolarizationo Cell to cell communication Electrical, chemical differences Gap junctions Contact-dependent signaling Local signaling Long-distance signaling Nervous System signalingo Signaling Pathways Know the common featureso Two categories of chemical signals Hydrophilic or lipophobic Lipophilic o Membrane receptors o G-protein Signal Transduction Know it’s commonly referred to as a second messenger system o Ca+/Calmodulin Signal Transduction o Signal modulation Agonist Antagonist - Cell Signaling o Control Systems Know what are the 3 basic parts to control system Know Cannon’s Postulates Know Local Control v. Reflex Controlo Response Loops Stimulus Sensor Afferent pathway Integration Center Efferent Pathway Effector Responseo Feedback Loops Negative feedback v. Positive feedback Feedforward control and biological rhythms o Systemic reflexes Speed, duration, intensity Endocrine reflexes last longer than neural reflexes Nature of the signal determines intensityo General hormones Origin of secretion Secretion Targets Concentrations Complexity of hormone action Complexity of endocrine function Hormone classificationso Protein/peptide hormones o Protein/peptide synthesiso Steroid hormones Synthesis, storage, and release Transport Mechanism of actiono Hormone action o The pituitary gland Anterior pituitary Posterior pituitary o Hypothalamic control of the pituitary gland Hormone secretion Portal system Function Effect that hormones have on hormoneso Endocrine pathologies Three basic patterns- Electrical Signaling o Organization of the Nervous System Two major systemso The neuron Three “regions”- Cell body- Dendrites- Axon Functional classes - Afferent - Interneurons - Efferent neurons o Glial cells General function 4 types found in CNS 2 types found in PNSo Electrical signaling in neurons Voltage-gated Chemically-gated Mechanically-gatedo Graded potentials o Action potentials The events that comprise an action potential What happens at the triggering event? What happens at threshold? The return to resting potential After the Action Potentialo The refractory period Know the 2 components: - Absolute - Relative o AP conduction o Myelination Nodes of Ranvier- Synapses o The synapse 5-step programo Neurotransmitters and neuromodulators 7 major classes based on structure all bind to one or more receptor types (Except NO) Fall into 2 catergories: GPCR, or ligand-gated ion channelo Neuroreception o EPSPs, IPSPs, and the GPSP o Neural pathways Divergence Convergence o Summation and Cancellation Temporal v. Spatialo Presynaptic inhibition/facilitation Changes the mechanismo Postsynaptic modulation Don’t need to
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