Chapter 11 Dynamic Study Module : BSC 1085 (Pritchard)

Which of the following best describes the concept of integration?

The nervous system processes and interprets sensory input and decides what should be done at each moment.

Which of the following statements about the developmental aspects of neurons is INCORRECT?

The number of adult neurons is the same as the number formed during the embryonic period.

Match the word with its corresponding statement: reflexes.

rapid automatic responses to a stimulus in which the particular stimulus always produces the same motor response

During which phase of an action potential are voltage-gated K+ channels open, while voltage-gated Na+ channels are closed?

repolarizing phase

Which of the following is NOT a structural classification of neurons?

sensory

Match the term to its correct description: simultaneous stimulation of many terminals, distributed widely over the surface of a postsynaptic neuron.

spatial summation

Match the term to its correct description: a stimulus that fails to generate an action potential.

subthreshold stimulus

Match the term to its correct description: numerous nerve impulses arriving at a synapse at closely timed intervals exert a cumulative effect.

temporal summation

Which criterion is used to structurally classify neurons?

the number of processes extending from their cell body

Match the term to its correct description: any stimulus above this intensity will result in an action potential in a neuron.

threshold stimulus

What is the difference between nerves and tracts?

Bundles of neuron processes are called tracts in the CNS and nerves in the PNS.

Which of the following is NOT true of efferent neurons?

Efferent neurons are bipolar.

Which of the following factors is associated with increased conduction velocity in an axon?

Large diameter

Match the system with its correct description: autonomic nervous system.

conducts impulses from CNS to internal organ muscles

Match the system with its correct description: somatic nervous system.

conducts impulses from CNS to skeletal muscles

Match the system with its correct description: central nervous system.

consists of the brain and spinal cord

Which of the following neurotransmitters acts as a natural opiate?

endorphins

A potential of -90 mV is considered __________.

hyperpolarized

Spatial summation occurs when __________.

multiple local potentials occur at different places on the same cell at the same time

Neurons can be classified structurally by the number of processes extending from their cell bodies. Which of the following is the most common neuron type in humans?

multipolar