Anatomy And Physiology 6th Edition By Elaine N. Marieb – Test Bank

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) What does the central nervous system use to determine the strength of a stimulus? 1)
A) size of action potentials B) type of stimulus receptor
C) frequency of action potentials D) origin of the stimulus
Answer: C
Explanation: A)
B)
C)
D)
2) When a neurotransmitter like acetylcholine is acting in an excitatory manner which of the following 2) is likely a result of the acetylcholine acting on the post synaptic cell? A) Chemically gated sodium channels will open.
B) Chemically gated potassium channels will open.
C) Chemically gated sodium channels will be closed.
D) Chemically gated chloride channels will open.
Answer: A
Explanation: A)
B)
C)
D)
3) Which of the following describes the nervous system integrative function? 3)
A) senses changes in the environment
B) responds to stimuli by gland secretion or muscle contraction
C) analyzes sensory information, stores information, makes decisions
Answer: C
Explanation: A)
B)
C)
4) An inhibitory postsynaptic potential (IPSP) is associated with ________. 4)
A) opening of voltage- regulated channels B) hyperpolarization
C) lowering the threshold for an action potential to occur
D) a change in sodium ion permeability
Answer: B
Explanation: A)
B)
C)
D)

5) Which of the following correctly describes a graded potential? 5)
A) it has a depolarization, repolarization and hyperpolarization phase B) it can have amplitudes of various sizes
C) it is initiated by voltage changes in the membrane D) it travels long distances
Answer: B
Explanation: A)
B)
C)
D)
6) When a sensory neuron is excited by some form of energy, the resulting graded potential is called 6) a(n) ________.
A) action potential B) postsynaptic potential
C) excitatory potential D) generator potential
Answer: D
Explanation: A)
B)
C)
D)
7) The concentration of ions in the chemical environment surrounding the neurons must be tightly 7) regulated for neurons to function properly. Which of the following cells is most responsible for this?
A) satellite cells B) astrocytes
C) Schwann cells D) oligodendrocytes
Answer: B
Explanation: A)
B)
C)
D)
B) the myelin sheath
C) large nerve fibers D) diphasic impulses
Answer: B
Explanation: A)
B)
C)
D)

B) They increase amplitude as they move away from the stimulus point.
C) They are short- lived.
D) They can be called postsynaptic potentials.
Answer: B
Explanation: A)
B)
C)
D)
10) Which of the following neurotransmitters inhibits pain and is mimicked by morphine, heroin, and 10) methadone?
A) nitric oxide B) endorphin C) serotonin D) acetylcholine
Answer: B
Explanation: A)
B)
C)
D)
11) If a motor neuron in the body were stimulated by an electrode placed about midpoint along the 11) length of the axon ________.
A) muscle contraction would occur
B) the impulse would move to the axon terminal only, and the muscle contraction would occur C) the impulse would spread bidirectionally
D) the impulse would move to the axon terminal only
Answer: C
Explanation: A)
B)
C)
D)