Question

Please No Explanation just ANSWER A,b,c,etc!

QUESTION 24

1. Fifty neurons release excitatory neurotransmitters onto the dendrites and body of neuron “A.” Neuron A reaches threshold and fires an action potential. This is an example of

   		saltatory summation.
   		continuous summation.
   		spatial summation.
   		temporal summation.

2. Which of the following terms does not belong with the others?

   		sodium
   		IPSP
   		excitatory
   		depolarize

3. 2 points   

   QUESTION 27

4. Which one of the following terms does not belong with the others?

   		graded potential
   		depolarizing phase
   		action potential
   		voltage-gated Na+ channel

5. 2 points   

   QUESTION 28

6. Which of the following is NOT a mechanism for removing neurotransmitters from a synapse?

   		neurotransmitters enter the postsynaptic cell through the chemical-gated channels
   		neurotransmitters are broken down by enzymes
   		neurotransmitters are reabsorbed by the presynaptic cell
   		neurotransmitters diffuse away from the synapse

7. 2 points   

   QUESTION 29

8. Depolarization is the result of ________ membrane permeability to _____ ions.

   		increased, potassium (K+)
   		decreased, sodium (Na+)
   		increased, sodium (Na+)
   		decreased, potassium (K+)

9. 2 points   

   QUESTION 30

10. When enough excitatory stimuli act on a neuronal cell, _____-gated Na channels on the axon hillock           open.

    		voltage
    		mechanical
    		ligand
    		chemically

11. 2 points   

    QUESTION 31

12. During the repolarization phase of the action potential, it is correct to say that

    a. the cell's permeability to sodium increases

    b. the cell's permeability to sodium decreases

    c. the cell's permeability to potassium increases

    both a and c are true

    both b and c are true

    		a. the cell's permeability to sodium increases
    		both b and c are true
    		c. the cell's permeability to potassium increases
    		b. the cell's permeability to sodium decreases

13. 2 points   

    QUESTION 32

14. Resting membrane potential is defined as

    		the movement of action potentials along a resting axon
    		the movement of sodium ions outside the membrane and the movement of potassium ions insode the membrane.
    		the movement of ions along a resting axon
    		the difference in electrical charges between the inside and outside of a resting nerve membrane.

15. 2 points   

    QUESTION 33

16. At resting potential, the ion distribution inside and outside of a neuron is such that ______ions are most abundant on the outside of the cell, while _____ ions are most abundant on the inside of the cell

    		Calcium; phosphate
    		Sodium; potassium
    		Potassium; sodium
    		Sulfate; potassium

Answer 1

Q24. Spatial summation

Spatial summation is the effect of triggering an action potential a neurone from one or more presynaptic neurones.

Q25. IPSP

Q27. Greaded potential

Q28. Neurotransmitters enters postsynaptic cell through chemical gated channels.

Q29. Increased, sodium

Q30. voltage

Q31. Both b and c are true

Permeability to potassium increases and permeability to sodium decreases

Q32. The difference in electrical charges between the inside and outside of a resting nerve membrane

Q33. Sodium, potassium