Chapter 29

________ 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. gated sodium channels are open c. it holds less sodium than the interstitial fluid d. both a and \(c\)

Action potentials occur when ________. a. potassium gates close b. a stimulus pushes membrane potential to threshold c. sodium-potassium pumps become active d. neurotransmitter is reabsorbed

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

Myelin that insulates axons is made by __________. a. neuroglial cells c. sensory neurons b. motor neurons d. interneurons

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

When something frightens you, _________ neurons increase their output. a. sympathetic b. parasympathetic

EEGs detect _______. a. sodium concentration c. electrical activity b. changes in blood flow d. glucose uptake

___________ have a pair of ventral nerve cords. a. sea stars b. vertebrates c. insects d. sea anemones

Alcohol affects coordination by affecting the __________. a. pons c. spinal cord b. cerebellum d. hypothalamus

Myelinated axons make up the brain's _____________. a. white matter c. gray matter b. ventricles d. meninges

Match the terms with their descriptions. ____thalamus ____dopamine ____limbic system ____corpus callosum ____cerebral cortex ____cerebellum ____neuroglia ____ganglion ____blood-brain barrier ____meninges a. coordinates motor activity b. connects the hemispheres c. protects brain and spinal cord from some toxins d. one type of neurotransmitter e. support team for neurons f. wrap brain and spinal cord g. roles in emotion, memory h. most complex integration i. cluster of neuron cell bodies j. regulates sleep-wake cycle