In a neuron, the opening of sodium gates typically leads to ________.
A) hyperpolarization of the plasma membrane
B) depolarization of the plasma membrane
C) drifting of plasma membrane voltage toward a more negative value
D) repolarization of the plasma membrane
E) plasma membrane voltage returning to the resting membrane potential
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Question 2) The glenoid cavity of the ________ articulates with the head of the ________.
A) sternum; humerus
B) humerus; scapula
C) scapula; humerus
D) radius; humerus
E) scapula; sternum
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Question 3) Negative feedback loops are ________.
A) self-amplifying cycles
B) not homeostatic mechanisms
C) associated with vicious circles
D) homeostatic mechanisms
E) usually harmful
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Question 4) Germ cells have ________ unpaired chromosomes and are thus called ________ cells.
A) 23; diploid B) 46; diploid C) 23; haploid D) 46; somatic E) 23; somatic
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Question 5) What causes reactive hyperemia to increase tissue perfusion?
A) Neural controls
B) Respiratory controls
C) Urinary controls
D) Local controls
E) Hormonal controls
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Question 6) The incus articulates with which bone(s)?
A) Malleus and stapes
B) Malleus, stapes, and temporal
C) Malleus, stapes, and tympanic
D) Malleus
E) Stapes
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Question 7) The antebrachium contains the ________.
A) scapula and clavicle
B) phalanges
C) humerus
D) carpals and metacarpals
E) radius and ulna
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Question 8) Where do most local potentials form in a neuron?
A) The somas
B) The Schwann cells
C) The dendrites
D) The trigger zone
E) The axon hillock
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Question 9) Eye color is caused by genes at multiple loci. This phenomenon is called ________.
A) incomplete dominance
B) sex linkage
C) multiple carriers
D) polygenic inheritance
E) pleiotropy
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Question 10) Three common components of a feedback loop are ________, ________, and ________.
A) stimulus; integrating (control) center; organ system
B) receptor; organ; organ system
C) receptor; integrating (control) center; effector
D) stimulus; receptor; integrating (control) center
E) receptor; integrating (control) center; organ system
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