Sc121 Unit 9 Assignment

SC131: Human Anatomy and Physiology II Name: Unit 9 Worksheet – Membrane Potentials Each answer is worth 1 point (20 points total) To complete this worksheet, select: Chapter 12: Nervous Tissue Animations Introduction to Membrane Potentials 1. Describe the neuron function. Neurons act to facilitate the transfer of data amongst the body’s cells sustaining homeostasis. 2. Contrast graded potentials and action potentials . Graded potentials are electrical signals that have variable amplitude, are localized, and travel short distances along the membrane. In contrast, an action potential has a Fxed amplitude, and can travel greater distances along the membrane. . 3. a. Describe how there can be an electrical change on either side of a membrane thereby generating a membrane potential. The membrane potential is due to the presence of an ionic concentration di±erence and electrical gradient between both sides of the membrane.movement of charged molecules across the cellular membrane leads to the creation of electrical signals b. What two characteristics must a membrane possess in order to generate and maintain electrical signals critical to nervous tissue? The two traits required for electrical signal generation and maintenance is the presence of a resting membrane potentials and ionic pumps that maintain ionic concentration and electrical gradients between the two sides of the membrane. Membrane Transport Proteins 4. What three membrane proteins are required if a membrane is to carry electrical impulses? These proteins are pores, gated channels, and ion (i.e. sodium/potassium) pumps. 5. Describe the activity of sodium and potassium ion channels. Pores are ion-speciFc and provide free access to their respective ions across the plasma membrane. Ions move through these pathways via di±usion – down their concentration gradient. 6. How do the following di±erentially a±ect gated channels ?  Chemicals (ligands) –  Voltage changes-  Mechanical deformation- Gated channels , like the open-access pores, are ion-specific. These gated passages are dependent on particular membrane-affecting agents to either open or close the gate. These may be distinct chemicals referred to as ligands. Voltage changes to the potential across the membrane also can alter these gates.

SC121: Human Anatomy and Physiology I Name_Maria Coca______________________ Unit 9 Worksheet – Membrane Potentials Each answer is worth 1 point (20 points total) To complete this worksheet, select:         Chapter 12: Nervous Tissue        Animations  Introduction to Membrane Potentials 1. Describe the neuron function.    Neurons act to facilitate the transfer of data amongst the body’s cells sustaining homeostasis 2. Contrast graded potentials and action potentials.  Graded potentials are electrical signals that have variable amplitude, are localized, and travel short distances along the membrane. In contrast, an action potential has a fixed amplitude, and can travel greater distances along the membrane. 3.   a. Describe how there can be an electrical change on either side of a membrane thereby generating a  membrane potential. The membrane potential is due to the presence of an ionic concentration difference and electrical gradient between both sides of the membrane.movement of charged molecules across the cellular membrane leads to the creation of electrical signals. b. What two characteristics must a membrane possess in order to generate and maintain electrical signals critical to nervous  tissue? The two traits required for electrical signal generation and maintenance is the presence of a resting membrane potentials and ionic pumps that maintain ionic concentration and electrical gradients between the two sides of the membrane. Membrane Transport Proteins 4. What three membrane proteins are required if a membrane is to carry electrical impulses? These proteins are pores, gated channels, and ion pumps.

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