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 has fewer sodium ions than the interstitial fluid d. sodium ions cross its membrane freely

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 b. the cell body c. dendrites d. the myelin sheath

Myelin is produced by ________. a. neuroglial cells b. motor neurons c. sensory neurons d. interneurons

Skeletal muscles are controlled by ________. a. sympathetic neurons b. parasympathetic neurons c. somatic motor neurons d. somatic sensory neurons

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

Damage to the________ can disrupt short-term memory. a. hypothalamus b. hippocampus c. peripheral nerves d. spinal cord

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

________have a pair of ventral nerve cords. a. sea stars b. vertebrates \(c .\) insects d. sea anemones

Alcohol affects coordination by its effect on the ________. a. pons b. cerebellum c. spinal cord d. hypothalamus

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