What is the job of the dendrite? A) Receive a stímulus B) Transmit an action pot
ID: 272192 • Letter: W
Question
What is the job of the dendrite? A) Receive a stímulus B) Transmit an action potential. C) Relay message to back and forth. D) All of the above 4 What organism lacks neurons, but yet their genes built the post-synaptic 112. A) Plants B) Inverts C) Poriferans D) Insects E) Bacteria 113 105 When are Na and K ions in equilibrium on either side of the axon membrane? A) When it is depolarized B) Before the Nal K pump kicks in C) After the K" channels have been open 114 D) All of the above are correct E They're never in equilibrium. NERVOUS SYSTEM 106-120 306 Phinneas Gage was famous for having A) killer birthday parties. B) a missing cerebellum. C) an enlarged medulla oblongata. D) a fistula E) a steel rod through his brain.Explanation / Answer
103. What is the job of the dendrite?
Answer. D All of the above
Explanation: Dendrites are thick extensions, coming directly from the cell body. They receive stimulus, transmit an action potential and relay impulse back and forth. Hence, all the given options are correct, making the correct option D.
104. C. Poriferans
Explanation: Poriferans- Sponges do not have nervous system but genomic toolkit functions as preneural system to protect the sponge and helps in signalling
105. E. They're never in Equilibrium
Equilibrium potential for K+ = 90 mV
Equilibrium potential for Na+ = 60 mV
Equilibrium potential is defined as the potential that exists when the concentration gradient for a given ion is counterbalanced with no net movement of the ion.
Resting membrane potential is not equal to the K+ equlibrium potential because teh nerves are not completely impermeable to Na+ which resluts in diffusion of sodium ions into the cells against potassium ions which move out of the cell
Option A states Depolarization: In depolarization phase, there is Sodium ions influx which depolarizes the threshold to -50 to -55 mv. Hence, this is not the correct answer
Option B Na+/ K+ pump kicks in: This is also not true, because it transports three Sodium ions for every two K+ ions to maintain membrane potential. So before this pump, there is no equilibrium. Hence, this option is not correct
Option C- K+ Channels: K+ channels also do not bring the equilibrium.
Hence, the correct answer is Option E. They're never in equilibrium
106. E. A steel rod through his brain
Explanation: Phineas Gage is a railroad worker who survived a severe brain injury where a steel rod went through his brain from under the left cheek bone and came out of the middle of forehead making injury to his frontal lobe.
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