Chapter 32

_________ relay messages from the brain and spinal cord to muscles and glands. a. Motor neurons c. Interneurons b. Sensory neurons d. Neuroglia

When a neuron is at rest, _______________. a. it is at threshold potential b. voltage-gated sodium channels are open c. sodium-potassium pumps are operating d. both a and

Action potentials occur when ____________. a. a neuron receives adequate stimulation b. more and more sodium gates open c. sodium-potassium pumps kick into action d. both a and b

True or false? Action potentials vary in their size.

Neurotransmitters are released by ____________ . a. axon terminals c. dendrites b. a neuron cell body d. the myelin sheath

What chemical is released by axon terminals of a motor neuron at a neuromuscular junction? a. ACh b. serotonin c. dopamine d. epinephrine

Which neurotransmitter is important in reward-based learning and drug addiction? a. ACh b. serotonin c. dopamine d. epinephrine

Skeletal muscles are controlled by ____________. a. sympathetic neurons c. somatic nerves b. parasympathetic neurons d. both a and b

When you sit quietly on the couch and read, output from ________ neutrons. a. sympathetic b. parasympathetic

Dorsal root ganglia contain _____________ of sensory neurons. a. cell bodies c. dendrites b. axon terminals d. all of the above

Which of the following are not in the brain? a. Schwann cells b. astrocytes c. microglia

Neurons are arrested in \(\quad\) of the cell cycle. a. \(G 1\) b. anaphase c. prophase d. S phase

____________ plays a role in emotion and memory. a. The brain stem c. The limbic system b. Broca's area d. The somatosensory cortex

Commands to move your right arm start in the _____________. a. left frontal lobe c. right temporal lobe b. right occipital lobe d. left parietal lobe

Match each item with its description. _____gray matter _____neurotransmitter _____pons _____corpus callosum _____cerebral cortex _____neural tube _____oligodendrocytes _____blood-brainbarrier a. start of brain, spinal cord b. connects the hemispheres c. protects brain and spinal cord from some toxins d. type of signaling molecule e. brain's myelin makers f. brain stem structure g. controls language, reasoning h. cell bodies and dendrites