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Magazine Problem 1
______ relay messages from the brain spinal cord to muscles. a. Neuroglia b. Motor neurons c. Interneurons d. Sensory neurons
Problem 2
An action potential occurs when ______. a. membrane potential increases to threshold level b. gated sodium channels close c. neurotransmitter is reabsorbed d. gated potassium channels open
Problem 3
Neurotransmitter is released by _____ at a chemical synapse. a. axon endings b. dendrites c. the cell body d. Schwann cells
Problem 4
A myelin sheath _____. a. prevents toxins from entering cerebrospinal fluid b. encloses all axons c. speeds transmission of signals along an axon d. gives gray matter its color
Problem 5
When you are startled, output from the _____ system increases. a. sympathetic b. parasympathetic
Problem 6
Skeletal muscles are controlled by the _____ system. a. sympathetic b. parasympathetic c. somatic
Problem 7
Match each animal with a description of its nervous system: Sea anemone grasshopper human a. paired ventral nerve cords b. nerve net c. brain, spinal cord, peripheral nerves
Problem 8
Signals that cause voluntary movement of your right arm originate in your ______ . a. right cerebral cortex b. left cerebral cortex c. cerebellum d. hippocampus
Problem 9
The spinal cord ______. a. contains neuron cell bodies, but no myelinated axons b. evolved from the notochord of early chordates c. extends through the vertebral column d. secretes cerebrospinal fluid
Problem 10
_______ both involve chemoreceptors. a. Hearing and smell b. Taste and touch c. Touch and smell d. Smell and taste
