BIOL 2160 Exam 3 | Questions with 100% Correct Answers

BIOL 2160 Exam 3 | Questions with 100% Correct Answers A larger than threshold stimulus would result in: a. more frequent action potentials b. none of these c. faster action potentials d. larger action potentials e. longer action potentials A stimulus that opens muscarinic acetylcholine receptors on the post-synaptic cell will generally result in the production of: a. EPSP b. IPSP Neurons do not have a resting membrane potential.(T/F) False An auto-immune disease that attacks myelin sheaths on ganglia will have a direct effect on which type of glial cell? a. Schwann cells b. Oligodendrocytes An EPSP arriving at a dendrite immediately after another EPSP arrives is an example of: a. Spatial summation b. Temporal Summation An individual with a BMI above 35 is approximately ____ times as likely to develop Type 2 diabetes than an individual with a BMI below 25. a. six b. three c. four d. two An injection of atropine would result in: a. No paralysis b. Skeletal muscle paralysis c. Both Skeletal and cardiac muscle paralysis d. Cardiac muscle paralysis Application of curare will prevent the production of: a. EPSPs b. IPSPs At -50mv, during the falling phase of an action potential, which is larger? a. K+ current b. Na+ current At rest, voltage-gated Na+ channels are found in which conformation? a. Closed (but capable of being opened) b. Inactivated c. Open At rest, which ion is the cell most permeable to? a. NA+ b. K+ Conductance affects driving force. (T/F) False Damaged beta cells in the pancreas would result in: a. Hypoglycemia b. Hyperglycemia During phase 3 of the action potential, the cell is: a. More permeable to K+ b. More permeable to Na+ During the relative refractory period, voltage gated K+ channels are: a. open b. closed During the falling phase of the action potential voltage-gated Na+ channels will be: a. Inactivated b. Closed c. Open During the post-absorptive state, more cells metabolize: a. Glucose b. Aldehydes c. Glycogen d. Protein and Fats During the relative refractory period, the cell is less permeable to: a. Na+ b. K+ Exocytosis of synaptic vesicles is a direct results of which ion? a. Na+ b. K+ c. Ca2+ High blood sugar will indirectly ______ the ph of the blood. a. Lower b. Raise How does insulin lower blood sugar levels? a. By causing downregulation of GLUT-4 b. By activating glucagon c. By making cells more permeable to glucose Hyper-osmolar Non-ketotic coma is a result of ______ urination. a. increased b. decreased Decreased insulin production would result in _____ urine output. a. increased b. decreased Inter neurons are located in the peripheral nervous system. (T/F) False Ion channels do which of the following to membrane resistance? a. increase b. decrease it is possible to produce an action potential during the absolute refractory period with a large enough stimulus. (T/F) False Movement of calcium from the sytosol into the Endoplasmic Reticulum (ER) is an active process. (T/F) True Neurotransmitters are used where? a. chemical synapses only b. Both electrical and chemical synapses only c. Electrical synapses only Skeletal muscle contraction is under control of: a. parasympathetic nervous system b. somatic nervous system c. afferent nervous system d. sympathetic nervous system The membrane potential moving from -50mv to -70mv is an example of: a. Repolarization b. Hyperpolarization c. Depolarization The nicotine acetyloline receptor is more permeable to Na+ than it is to K+. (T/F) False The permeability of the cell to K+ is highest during: a. At rest b. The falling phase c. The rising phase d. The undershoot The permiability of the cell to Na+ will be highest at membrane potentials more ______ than -70mv. a. positive b. negative