Answer to Question #59099 in Cell Biology for Tracy Guido

Question

19.
Which of the following describes how neurons use neurotransmitters to communicate with one another?
The axons of one neuron connect to the axons of another neuron to relay information through neurotransmitter release.
At synapses, dendrites release neurotransmitters that are recognized by proteins on axons.
Axons fuse with dendrites to produce a continuous cellular body that allows neurotransmitters to flow from one neuron to another.
At synapses, axons release neurotransmitters that are recognized by proteins on dendrites.

21.
Select the descriptions that apply to the sodium-potassium pump. More than one answer
Sodium ions and potassium ions move into and out of the plasma membrane by osmosis.
The pump helps to maintain the concentration of sodium and potassium ions in living cells.
The pump is an active mechanism for transporting ions through the plasma membrane.
The concentration gradient of the ions determines the direction of movement through the pump.

Answer 1

19. At synapses, axons release neurotransmitters that are recognized by proteins on dendrites. The synaptic cleft is formed by axon terminal and dendites of the postsynaptic neuron.

21. The pump helps to maintain the concentration of sodium and potassium ions in living cells.
The pump is an active mechanism for transporting ions through the plasma membrane.

These are correct because pump maintains concentration gradient of these ions and it uses active transport for this purpose.