Graded potential have to reach the threshold of ______ to trigger and action pot

Question

Graded potential have to reach the threshold of ______ to trigger and action potential. A) -70mV B) -55mV C) 0mV D) +55mV E) +70mV The trigger zone of neurons have _____ ion channels than aare present in dendrites A) more B) less The drug L-DOPA is used to treat A) Alzheimer's disease B) Parkinson's Disease C) depression D) ADHD A decrease in dopamine neurons seen in the Substantia nigra region of the brain would lead to a) a decrease in muscular movement b) an increase in muscular movement c) paralysis d) dopamine does not control movement and hence no effect Which of these is not part of the limbic system a) amygdata b) cerebellum c) hippocampus d) cingulated gyrus Brains are developing and forming neural connections well into a person's mid-twenties. a)true b)false Drugs such as novacaine used to numb patients during dental surgery work by a) blocking sodium channels b) blocking dopamine reuptake c) increasing epinephrine production In the figure on the right ____ are dendrites In the same figure the greatest concentrations of ion channels are found in the region marked ________ When our bodies are under duress serotonin levels can be ______ to modulate the intensity of pain. a) Increased b) decreased c) does not change Stimulation of ganglionic cells in our eyes occurs when (56) ____ production (57) _____ a) Glycine b) dopamine c)glutamate d) ceases e) increases In the figure on the right wherein the skin is poked with needles, where would the person feel only one pinprick? A or B When hair cells inside our ear are stimulated the ion involved is a) sodium b) magnesium c) calcium d) potassium Botox is a drug made from a toxin produced by the bacterium Clostridium botulinum and is injected into skin for cosmetic purposes to 'improve' appearances. It works by a) blocking Ach release b) increasing Ach release c) binding to calcium receptors

Explanation / Answer

46.b Most often, the threshold potential is a membrane potential valuebetween –50 and –55 mV, but can vary based upon several factors.

47.aThese have more ion channels than dendrites.

48.b a drug, it is used in the clinical treatment of Parkinson's disease .

49.It will lead to decrease muscular movement.

50.b.The structures of the limbic system are involved in motivation, emotion, learning, and memory. The limbic system is where the subcortical structures meet the cerebral cortex.cerebellum is not a part of it.

51.a true.

52.a.It blocks sodium channel.

54.a axon terminal

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