Question

question 12
1 pts
choose the answer.
the scanning device that can record the electrical activity of the brain and denote stages of sleep is the:

• eeg
• mri
• fmri
• pet - scan

question 13
1 pts
choose the answer.
the chemicals that bridge the synaptic gap are referred to as:

• enzymes
• compounds
• axons
• neurotransmitters

question 14
1 pts
choose the answer.
the basic unit of the nervous system is the:

• neuron
• nerve
• synapse
• myelin

Explanation:

Question 12

EEG (Electroencephalogram) records brain's electrical activity, used to study sleep stages. MRI, fMRI, and PET - scan have different functions (MRI for structure, fMRI for brain activity via blood flow, PET - scan for metabolic activity), not for recording electrical activity of brain related to sleep stages.

Neurotransmitters are chemicals that cross the synaptic gap to transmit signals between neurons. Enzymes are for catalyzing reactions, compounds is a general term, and axons are parts of neurons (not chemicals bridging synaptic gap).

The neuron is the basic unit of the nervous system, responsible for transmitting information. Nerves are bundles of neurons, synapses are junctions between neurons, and myelin is a protective sheath around axons (not the basic unit).

Answer:

A. EEG

Question 13