BIO202 LCC Exam 1 Study Set COPY Verified Practice Questions And 100% Correct Answers.

An action potential originated at the ________ and travels along the axon until it reaches the _________. - correct answers Axon hillock: axon terminal What type of ion channels in the membrane of neurons allow ions to move across the membrane at rest, and thereby contribute to resting membrane potential? - correct answers Leak channels In a neuron, where is the greatest concentration of voltage-gated sodium and voltage-gaged potassium channels? - correct answers Axon hillock In a neuron, where are voltage-gated calcium channels located? - correct answers Axon terminal What type of cell enhances the velocity of electrical transmission of an action potential along an axon in the central nervous system? - correct answers oligodendrocyte Which of the following statement is true when a neuron is at rest? - correct answers-there is a stronger electrochemical force acting on sodium ions than on potassium ions -permeability to potassium is greater than permeability to sodium -potassium is nearer to being at equilibrium than sodium T/F During the relative refractory period, the stimulus intensity required to initiate an action potential is elevated. - correct answers T T/F Once an action potential is generated, it will always depolarize the neighboring membrane above threshold, ensuring the action potential will travel along the axon without interruption. - correct answers T T/F The NA+/K+ pump is electrogenic. - correct answersT Which of the following is NOT one of the major cell types found in the human body? a. Endocrine cells b. Muscle cells c. Epithelial cells d. Nervous cells e. Connective tissue cells - correct answers A- endocrine cells The process of maintaining the internal environment in a state compatible for life is called ___________, and it occurs primarily through __________. - correct answers Homeostasis, negative feedback Which of the following is NOT a part of the internal environment? - correct answers Airway to lungs Exercise provides a substantial stressor to many systems of the body, including the cardiovascular system, forcing the body to_______________. - correct answers Prioritize resource allocation What type of gland secretes products into ducts leading to the external environment? - correct answers Exocrine glands What is the primary mechanism for maintaining homeostasis? - correct answers negative feedback Which transport processes can be saturated, that is, can reach a transport maximum? - correct answers-Secondary active transport -Primary active transport -Facilitated diffusion The concentration of an anion inside a cell is 0.3%. The concentration of this anion outside the cell is 0.1%. How could the cell obtain more of this ion inside the cell? - correct answers a