Collectively, the conducting cells that carry the impulse from the SA node to the AV node is known as the
A) conducting system.
B) AV block.
C) internodal pathway.
D) bundle branches.
E) pacemaker cells.
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Question 2) The basic heartrate established by the SA node is called the
A) pacemaker potential.
B) action potential.
C) vagal tone.
D) sinus rhythm.
E) SA potential.
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Question 3) Gradual drifting of membrane potential toward threshold in autorhythmic cells is termed a
A) receptor potential.
B) pacemaker potential.
C) gated potential.
D) ligand-gated potential.
E) action potential.
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Question 4) Which of the following statements is false regarding fluid and electrolyte balance?
A) Fluctuations in diet will affect babies less because they have so much water content.
B) Older people tend to become more dehydrated.
C) Kidney functions tend to decrease as one ages.
D) Aging correlates with problems in various organ systems, which can enhance acid-base imbalance problems.
E) A fetus obtains water and electrolytes from the maternal bloodstream.
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Question 5) Which of the following describes what is directly measured by an ECG?
A) the force of contractions
B) blood vessel resistance
C) end-systolic volume
D) electrical conduction
E) neural stimulation of cardiac myocytes
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Question 6) All of the following are examples of compensatory mechanisms that would occur as a result of metabolic acidosis except
A) buffer systems accept H+.
B) kidneys secrete H+.
C) kidneys retain H+.
D) kidneys generate bicarbonate.
E) respiratory rate increases.
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Question 7) Tissue factor is a factor in the ________ pathway.
A) extrinsic
B) intrinsic
C) common
D) retraction
E) fibrinolytic
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Question 8) The region of the nephron containing intercalated cells primarily associated with pH balance is the
A) glomerulus.
B) proximal convoluted tubule.
C) nephron loop.
D) collecting duct.
E) papillary duct.
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Question 9) Tissue factor (Factor III) is a factor in the ________ pathway.
A) extrinsic
B) intrinsic
C) common
D) retraction
E) fibrinolytic
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Question 10) The proximal convoluted tubule cells are
A) cuboidal cells with microvilli.
B) cuboidal cells without microvilli.
C) squamous cells.
D) columnar cells with microvilli.
E) columnar cell without microvilli.
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