Excitable cells Study guides, Class notes & Summaries

NURS 5315 Advanced Pathophysiology Ovarian cancer site of metastasis? Peritoneal surfaces, omentum (fold of peritoneum connecting the stomach with other abdominal organs), liver The increased NADH/NAD+ ratio in the liver from ethanol causes: 1. Pyruvate --> lactic acid, causing lactic acidosis 2. Oxaloacetate --> malate. This prevents gluconeogenesis and leads to hypoglycemia 3. Glyceraldehyde-3-phosphate --> glycerol 3- phosphate and combines with fatty acids to form triglyce...

Cellular Physiology 1. Analyze the steps of the action potential. ● Sodium permeability increases, sodium ions move into the cell increasing positivity, depolarization is occurring, action potential threshold is reached as cell becomes more positive, potassium permeability increases, potassium ions leave the cell, repolarization is occurring, resting membrane potential is reestablished. · The action potential carries signals along the nerve or muscle cell and conveys information from o...

ANP EXAM 3 QUESTIONS & ANSWERS 2024/2025 In a bedridden patient recovering from a badly fractured femur, disuse atrophy in the thigh muscles is caused by _________. decreased ability of muscle cells to produce ATP, resulting in decreased ability of the muscles to contract decreased ability to synthesize acetylcholine in the neurons that innervate the thigh muscles decreased synthesis of muscle proteins and/or increased breakdown of muscle proteins none of the above - ANSWERSdecreased ...

SCRN Review (CNRN Part 1) Exam 2023. By definition, what is a neuron? - Answer- An excitable cell that is capable of conducting electrical signals and receive stimuli from the central and peripheral fields What are neuroglia? - Answer- Non-excitable cells with supportive and protective functions What are the two cell categories in the nervous system? - Answer- Neurons (excitable) Neuroglia (nonexcitable) What part of the neuron receives signals? - Answer- Dendrites What part of the neuro...

3 characteristics that distinguish nervous systems from endocrine systems - correct answer NERVOUS SYSTEM: -Rapidly transmitted signals -neurotransmitters over synapses -action potentials over long distances ENDOCRINE SYSTEM: -Slower transmission via circulatory system -hormones as the chemical messangers 2 types of chemical signaling aside from those used in nervous and endocrine systems - correct answer AUTOCRINE/PARACRINE: chemicals secreted by cells with local effects ...

Which of the following situations occurs in electrically excitable cells? Select one: a. The sodium-potassium pump moves sodium into the cell. b. The opening and closing of ligand-gated channels cause depolarization. c. Sodium ion channels are opened by high extracellular calcium levels. d. When Na ion channels open, K ion channels close. e. Depolarization causes voltage-gated sodium ion channels to open. + + My Account Question 2 Correct 5.00 points out of 5.00 Question 3 Correct ...

SCRN Review (CNRN Part 1) Exam 2023. By definition, what is a neuron? - Answer- An excitable cell that is capable of conducting electrical signals and receive stimuli from the central and peripheral fields What are neuroglia? - Answer- Non-excitable cells with supportive and protective functions What are the two cell categories in the nervous system? - Answer- Neurons (excitable) Neuroglia (nonexcitable) What part of the neuron receives signals? - Answer- Dendrites What part of the neuro...

How are cells connected to each other and the extra-cellular matrix? correct answers -gap junctions -tight junctions -anchorning junctions How do we classify epithelial tissue? correct answers -cell shape -number of layers What is a Gap junction? correct answers Mediates cell to cell communication, Aggregates of intercellular channels that permit direct cell to cell transfer of ions and small molecules, What does a gap junction do? correct answers -connects to the cytoplasm in adja...

Steps of action potentiial Correct Answer Process by which excitable cells transmit information to one another Occurs mostly in nerve and muscle cells Action potential altered by calcium imbalance Correct Answer Hyopcalcemia: increases cell permeability to sodium -> progressive depolarization —> RMP and threshold potential to be closer —> easier to activate action potential -> cells are more excitable -> tetany, hyperflexia, circumoral pareshesias, seizure, dysrhythmias ...

Excitability correct answers the ability of non-pacemaker heart cells to respond to an electrical impulse that begins in pacemaker cells. Depolarization correct answers occurs when the normally negatively charged cells within the heart muscle develop a positive charge. Conductivity correct answers the ability to send an electrical stimulus from cell membrane to cell membrane. As a result, excitable cells depolarize in rapid succession from cell to cell until all cells have depolarized. Ex:...