Chapter 29

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

Action potentials occur when _____. a. potassium gates close b. a stimulus pushes membrane potential to threshold c. sodium-potassium pumps kick into action d. neurotransmitter is reabsorbed

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

Myelin around peripheral nerves is made by _____. a. Schwann cells b. motor neurons c. sensory neurons d. interneurons

Skeletal muscles are controlled by _____. a. sympathetic signals b. parasympathetic signals c. Both prevail. d. Neither prevails.

When you sit quietly on the couch and read, output from the _____ system prevails. a. sympathetic b. parasympathetic c. Both prevail. d. Neither prevails.

Skeletal muscles contract in response to _____. a. acetylcholine (ACh) b. dopamine c. serotonin d. endorphins

The cerebrum is part of the _____. a. forebrain b. midbrain c. hindbrain d. brain stem

Morphine mimics natural painkillers called _____.

Parkinson's disease involves low levels of _____. a. acetylcholine (ACh) b. dopamine c. serotonin d. endorphins

Myelinated axons make up the _____ matter of the brain and spinal cord.

Match the terms with their descriptions. a. coordinates motor activity b. connects the hemispheres c. protects brain and spinal cord from some toxins d. type of signaling molecule 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. stretch-sensitive receptor muscle spindle _____ neurotransmitter _____ limbic system _____ corpus callosum _____ cerebral cortex _____ cerebellum _____ neuroglia _____ ganglion _____ blood–brain barrier _____ meninges _____