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WorksheetsA&P chpt 15 the heart part 2
Total questions: 24
Worksheet time: 22mins
specialized cells in the cardiac muscle that generate action potentials to stimulate contraction
pacemaker cells
Neurons
Intercalated discs
Gap junctions
The heart's primary pacemaker, where normal cardiac impulses arise
sinoatrial node
The lungs
The brain
fibers that conduct impulses to the left atrium and both atria begin to contract
interatrial bundle
Ventricular bundle
Atrioventricular node
Sympathetic nerves
group of pacemaker cells in the interatrial septum that relays impulses from the atria to the ventricles
atrioventricular node (AV)
Bundle of His
Sinoatrial node
Purkinje fibers
Nerve like processes that extend from the bundle branches to the ventricular myocardium; for the last part of the cardiac conduction
purkinje fibers
Cardiac muscle fibers
Cardiac pacemaker cells
Atrioventricular node
Match the following firing rates with the heart's pacemakers
60-80 BPM
SA node
40-60 BPM
AV node
20-40 BPM
Purkinje fibers
record of the electrical currents in the heart
Electrocardiogram (ECG)
Ultrasound
Magnetic Resonance Imaging (MRI)
X-ray
On an electrocardiogram, the QRS complex represents
atrial depolarization
ventricular depolarization
ventricular repolarization
impulse transmission from the atria to the ventricles
Match the following terms
atrial depolarization
P wave
time it takes for the cardiac impulse to travel from the atria to the ventricles
PR interval
ventricular depolarization
QRS complex
end of ventricular depolarization and beginning of ventricular repolarization
ST segment
ventricular repolarization
T wave
Match the following arrhythmias
when an ectopic focus in the atria fires rapidly, causing the atria to contract between 200-400 times per minute
atrial flutter
atria quiver instead of contract. this allows blood to pool in the atria, leading to the potential of blood clots
in atrial fibrillation
life threatening emergency resulting for electrical signals arising from different regions of the myocardium
ventricular fibrillation
The series of events that occur from the beginning of one heartbeat to the beginning of the next
cardiac cycle
Circulatory pattern
Pulse sequence
respiration
Refers to the amount of blood the heart pumps in 1 minute.
Cardiac output (CO)
Heart rate
Blood pressure
Blood volume
CO = HR X SV
true
false
Match the following
CO
the amount of blood pumped by the heart in 1 minute
HR
the number of times the heart beats in 1 minute
SV
the amount of blood ejected by the heart with each beat
Which body system can alter the heart's rhythm and force of contractions?
Nervous system
The digestive system
The respiratory system
The endocrine system
The average resting cardiac output is between (a) per minute
Part of the brain that contains the cardiac center
medulla
Cerebellum
Hypothalamus
Cerebrum
During cardiac output, the ventricles eject 60-80% of their blood volume, this percentage is called
ejection fraction
The heart rate
The cardiac output
Match the following factors that affect stroke volume
amount of tension or stretch in the ventricular muscle just before it contracts
preload
The force with which ventricular ejection occurs
contractility
States that the more the ventricle is stretched, the more forcefully it will contract
Starlings law of the Heart
Afterload
forces that the heart muscle must work against to eject its volume of blood
What is the term used to describe the amount of tension or stretch in the ventricular muscle just before it contracts?
contractility
afterload
ascites
preload
The (a) system can cause the heart rate to (b) by sending impulses via the (c) nervous system.
The (a) nervous system sends signals to (b) the (c) rate
Reorder the following steps when left ventricular failure occurs
left ventricle falls behind in ejecting all the blood it receives from the lungs
blood backs up in the lungs
causing shortness of breath, pulmonary edema, coughing
Reorder the following steps when right ventricular failure occurs
right ventricle fails in ejecting all the blood it receives from the systemic circulation
blood backs up into the vena cava and throughout the peripherak vascular system
resulting in systemic edema, enlargement of the liver and spleen, pooling of fluid in the abdomen, distension of jugular vein, swelling of the ankles& feet
