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Patho FHEA Midterm Exam||Verified Exam!!||
Questions And Correct Detailed Answers (verified
Answers) ||Already Graded A+||Newest Exam!!!
Rate-setting slow response cardiac tissue will depolarize
independent of autonomic influence. However, in the
presence of sympathetic stimulation, what is the
physiologic process that increases heart rate? - answer-
lower depolarization threshold
Parasympathetic stimulation of rate-setting tissue results
in: - answer-k+ channels opening.
The primary difference between fast response and slow
response cardiac action potentials is that: - answer-fast
response potentials are approximately 300 msec in
duration.
The term "inward rectifier" is another name for: - answer-
k+ channels open at rest.
Open ___ channels are responsible for maintaining
voltage in resting state. - answer-potassium (k+)
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After an electrical stimulus is generated by the
atrioventricular (av) node, which ion channels open to
affect the depolarization stage 0? - answer-na+
Cardiac contraction occurs when calcium channels open
and calcium influx occurs. What is the stimulus that opens
calcium channels? - answer-depolarization from na+ influx
In contractile cells, what is happening to na+ channels in
phase 3? - answer-h gates recover.
Which ion is not generally regarded to be a factor in fast
response action potentials? - answer-cl-
Which of the following is a unique feature of action
potentials in atria? - answer-the plateau phase is not as
prominent as fast response cells.
Among the variety of tissue types found in cardiac muscle,
which type has the greatest ability to beat autonomously?
- answer-sinoatrial (sa) node tissue
One of the consequences of ischemic myocardium is
coronary artery disease (cad). This can lead to
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dysrhythmia because it: - answer-depolarizes
myocardium.
The specialized rapid conduction tissue that is important to
ventricular muscle contraction is known as: - answer-the
his-purkinje system
The conduction block phenomenon characterized by slow
conduction and unidirectional block is known as: - answer-
a re-entry block.
Contraction of cardiac cells occurs as a consequence of
filament sliding and binding. Which of the filaments is
anchored onto z bands of the sarcomere? - answer-actin
Which of the following events occurs first during
mechanical contraction of the myocardium? - answer-
calcium is released from sarcoplasmic reticulum.
According to the frank-starling performance curve, all of
the following are indices of cardiac performance except: -
answer-sympathetic nervous system.
Patho FHEA Midterm Exam||Verified Exam!!||
Questions And Correct Detailed Answers (verified
Answers) ||Already Graded A+||Newest Exam!!!
Rate-setting slow response cardiac tissue will depolarize
independent of autonomic influence. However, in the
presence of sympathetic stimulation, what is the
physiologic process that increases heart rate? - answer-
lower depolarization threshold
Parasympathetic stimulation of rate-setting tissue results
in: - answer-k+ channels opening.
The primary difference between fast response and slow
response cardiac action potentials is that: - answer-fast
response potentials are approximately 300 msec in
duration.
The term "inward rectifier" is another name for: - answer-
k+ channels open at rest.
Open ___ channels are responsible for maintaining
voltage in resting state. - answer-potassium (k+)
,2|Page
After an electrical stimulus is generated by the
atrioventricular (av) node, which ion channels open to
affect the depolarization stage 0? - answer-na+
Cardiac contraction occurs when calcium channels open
and calcium influx occurs. What is the stimulus that opens
calcium channels? - answer-depolarization from na+ influx
In contractile cells, what is happening to na+ channels in
phase 3? - answer-h gates recover.
Which ion is not generally regarded to be a factor in fast
response action potentials? - answer-cl-
Which of the following is a unique feature of action
potentials in atria? - answer-the plateau phase is not as
prominent as fast response cells.
Among the variety of tissue types found in cardiac muscle,
which type has the greatest ability to beat autonomously?
- answer-sinoatrial (sa) node tissue
One of the consequences of ischemic myocardium is
coronary artery disease (cad). This can lead to
, 3|Page
dysrhythmia because it: - answer-depolarizes
myocardium.
The specialized rapid conduction tissue that is important to
ventricular muscle contraction is known as: - answer-the
his-purkinje system
The conduction block phenomenon characterized by slow
conduction and unidirectional block is known as: - answer-
a re-entry block.
Contraction of cardiac cells occurs as a consequence of
filament sliding and binding. Which of the filaments is
anchored onto z bands of the sarcomere? - answer-actin
Which of the following events occurs first during
mechanical contraction of the myocardium? - answer-
calcium is released from sarcoplasmic reticulum.
According to the frank-starling performance curve, all of
the following are indices of cardiac performance except: -
answer-sympathetic nervous system.
