biospych part 2

automatic muscular responses to stimuli

A graded depolarization is known as an ___. It results from a flow of sodium ions into the neuron. increase the likelihood of a postsynaptic action potential occurring

is a network of nerves that helps your body activate its “fight-or-flight” response . This system’s activity increases when you’re stressed, in danger or physically active

chemical messengers in the body. Their job is to transmit signals from nerve cells to target cells. These signals help regulate bodily functions ranging from heart rate to appetite

bursts of release of neurotransmitters from the presynaptic neuron.

measures the small changes in blood flow that occur with brain activity. it is less expensive and risky in comparison with PET scans

-researchers examine detailed brain anatomy in living people. One method is ______, better known as ______

using light to control a limited population of neurons.

records electrical activity of the brain through electrodes—ranging from just a few to more than a hundred—attached to the scalp

the removal of a brain area, generally with a surgical knife.

instead of measuring electrical activity, it measures the faint magnetic fields generated by brain activity.

provides a high-resolution image of activity in a living brain by recording the emission of radioactivity from injected chemicals

The _______ is a thick bundle of nerve fibers that connects the two cerebral hemispheres, allowing them to communicate. It is also involved in movement control, cognitive functions, and vision