CNS Quiz Out

1. The nervous system has three overlapping functions. Which of the following represents a logical sequence of these three functions?

• a) Motor output, integration, sensory input

• b) Sensory input, motor output, integration 

• c) Sensory input, integration, motor output

• d) Integration, sensory input, motor output 

2. The motor or efferent nervous system has two subdivisions. The skeletal muscles are served by the ______ nervous system, while cardiac and smooth muscle and glands are served by the ______ nervous system. 

• d) somatic; autonomic

• a) sensory; central 

• c) parasympathetic; somatic 

• b) autonomic; somatic 

 

3.  The ______ nervous system is known as the ______ division because it prepares the body for activity. While the ______ nervous is known as the _______ division because it prepares the body to conserve energy.

• c) sympathetic; rest & digest; parasympathetic; fight-or-fligh

• a) somatic; fight-or-flight; sensory; rest & digest 

• d) parasympathetic; rest & digest; sympathetic; fight-or-flight

• b) sympathetic; fight-or-flight; parasympathetic; rest & digest

6. "Nerves" are found in the ______ while "tracts" are found in the ______.

• d) spinal cord; brain

• b) brain; legs and arms 

• a) CNS; PNS

• c) PNS; CNS

 

7. The portion of a neuron that conducts action potentials or nerve impulses is the ______. 

• d) axon terminal

• b) axon

• c) dendrite

• a) cell body

9. The myelin sheet is formed by _____ cells in the PNS, while it is formed by ______ in the CNS. 

• c) Astrocytes; Oligodendrocytes

• a) Schwann; Schwann

• d) Schwann; Oligodendrocytes

• b) Oligodendrocytes; Schwann 

11. Ligand-gated ion channels generate _____, whereas voltage-gate ion channels generate _____.

• e) action potentials; action potentials

• d) graded potentials; graded potentials

• a) action potentials; graded potentials

• c) graded potentials; action potentials 

13. Which type of potential does not decay with distance?

• c) Action potential 

• b) Graded potential 

• a) Generator potential

15. Neurons generally repolarize once the membrane potential reaches approximately +30 mV because ______.

• b) voltage-gated potassium channel gates open

• a) chemically gated sodium channels open

• c) voltage-gated calcium channel gates open 

• d) voltage-gated sodium channel gates close 

17. Stronger stimuli are interpreted when the CNS receives _____ action potentials.

• d) higher magnitude 

• a) lower magnitude

• c) more frequent

• e) none of the above