Which type of lever is demonstrated by using scissors?
A) a first-class lever
B) a second-class lever
C) a fourth-class lever
D) a third-class lever
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Question 2) The ________ helps keep food between the grinding surfaces of the teeth during chewing.
A) risorius
B) orbicularis oris
C) buccinator
D) mentalis
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Question 3) In myelinated axons the voltage-regulated sodium channels are concentrated at the nodes of Ranvier.
Indicate whether the statement is true or false
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Question 4) The interior surface of a neuron's plasma membrane at resting membrane potential will have a ________.
A) negative charge and contains more sodium than outside of the cell
B) positive charge and contains less sodium than outside of the cell
C) positive charge and contains more sodium than outside of the cell
D) negative charge and contains less sodium than outside of the cell
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Question 5) Which of the following is an excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle?
A) gamma aminobutyric acid
B) cholinesterase
C) norepinephrine
D) acetylcholine
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Question 6) Enkephalins and endorphins are peptides that act like morphine.
Indicate whether the statement is true or false
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Question 7) A second nerve impulse cannot be generated until ________.
A) all sodium gates are closed
B) the membrane potential has been reestablished
C) the Na ions have been pumped back into the cell
D) proteins have been resynthesized
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Question 8) The ________ runs deep to the internal oblique.
A) transversus abdominis
B) external oblique
C) latissimus dorsi
D) rectus abdominis
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Question 9) Most superficial thorax muscles are extrinsic shoulder muscles.
Indicate whether the statement is true or false
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Question 10) Bipolar neurons are commonly ________.
A) motor neurons
B) called neuroglial cells
C) found in the retina of the eye
D) found in ganglia
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