Refer to the following graph of an action potential to answer the next four ques

Question

Refer to the following graph of an action potential to answer the next four question(s) below 35 77. (1 pt) Voltage-gated potassium channels are open and the membrane potential is closest to the equilibrium potential for potassium at label A) A B) B C) C D) D E) E . 78, (1 pt) The neuronal membrane is at its resting potential at label A) A B) B C) C D) D E) E 79. (1 pt) The minimum graded depolarization needed to operate the voltage-gated sodium and potassium channels is indicated by the label- A) A B) B C) C D) D E) E 80. In sensory systems, the greater the stimulus, the higher the of action potentials. A) depolarization B) duration C) repolarization D) frequency 81. After eating a large meal, which nerves are most active in your digestive system? l) parasympathetic nerves Il) somatic (motor) nerves Ill) sympathetic nerves A) only I B) only I C) only IIl D) only II and Ill Page 11 of 22

Explanation / Answer

77. The Potassium channels open when the potential reaches the peak and the sodium channels close. The answer is A

78. The neuronal resting potential reaches to a value of -70mV after all, the voltage-gated channels are closed. The answer is E

79. The graded potential is known as the threshold potential. Once the membrane has achieved this potential it will for sure exhibit an action potential. The answer is A

80. The greater the stimulus, the higher the depolarization of the membrane to achieve more action potential.

81. The answer is only I (A) i.e. parasympathetic nerves. This branch of nerves controls the whole process of digestive system.

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