10817236
Descripción
Test por Felicity B, actualizado hace más de 1 año
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Creado por Felicity B
hace alrededor de 7 años
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Pregunta 1
Pregunta
A blood vessel that takes blood away from the heart is called a/an
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Artery
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Vein
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Capillary
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Ventricle
Pregunta 2
Pregunta
The heart chamber that pumps oxygen depleted blood to the lungs is the
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Right atrium
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Right ventricle
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Left atrium
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Left ventricle
Pregunta 3
Pregunta
The systemic circulation
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Begins with oxygen rich blood entering the aorta
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Supplies blood to all tissues of the body
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Ends with oxygen depleted blood entering the right atrium
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All of the above
Pregunta 4
Pregunta
Cardiac muscle cells are electrically connected via
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Desmosomes
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Gap junctions
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Striations
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Motor units
Pregunta 5
Pregunta
TRUE or FALSE The series of events that create an Action Potential in a neuron are exactly the same as those that create and Action Potential in a cardiac muscle cell
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- True
- False
Pregunta 6
Pregunta
TRUE or FALSE The normally functioning cardiac muscle cell always completely relaxes prior to contracting again due to calcium influx that lengthens the refractory period
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- True
- False
Pregunta 7
Pregunta
TRUE or FALSE All cardiac muscle cells can spontaneously generate action potentials.
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- True
- False
Pregunta 8
Pregunta
In myocardial autorhythmic cells (pacemaker cells), when threshold is reached the action potential fires because
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Voltage gated sodium channels open and sodium rushes into the cell
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Voltage gated calcium channels open and calcium rushes into the cell
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Voltage gated potassium channels open and potassium rushes out of the cell
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Increased leaky channels open and there is net sodium influx
Pregunta 9
Pregunta
In pacemaker cells, decreased permeability to calcium will
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Increase heart rate
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Decrease heart rate
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Have no effect on heart rate
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Increase force of muscle contraction
Pregunta 10
Pregunta
Parasympathetic nervous stimulation onto pacemaker cells results in
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Increased heart rate
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Decreased heart rate
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No change in heart rate
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Increased force of muscle contraction
Pregunta 11
Pregunta
TRUE or FALSE Once pacemaker cells have fired an action potential, this depolarisation spreads throughout the rest of the cardiac muscle cells via the gap junctions
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- True
- False
Pregunta 12
Pregunta
1. In a normally functioning heart the pacemaker cells are in the
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Sinoatrial (SA) node
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Atrioventricular (AV) node
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Autonomic nerves
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Purkinje fibres
Pregunta 13
Pregunta
TRUE or FALSE In a normal cardiac cycle, the ventricles contract first, followed by the atria
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- True
- False
Pregunta 14
Pregunta
In an ECG reading, the T wave represents
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Depolarisation of the atria
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Depolarisation of the ventricles
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Repolarisation of the ventricles
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Force of contraction
Pregunta 15
Pregunta
1. The relaxation phase of the cardiac cycle is called
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Diastole
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Systole
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Depolarisation
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Isovolumic ventricular contraction
Pregunta 16
Pregunta
During the cardiac cycle the phase when the ventricles are contracting and blood is being ejected into the arteries is called
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Diastole
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Systole
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Depolarisation
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Isovolumic ventricular contraction
Pregunta 17
Pregunta
When the atrioventricular valves are open
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Blood is flowing from the ventricles into the atria
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Blood is flowing from the atria into the ventricles
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Blood is being ejected from ventricles into arteries
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Blood is being ejected from atria into veins
Pregunta 18
Pregunta
In order for the semilunar valves to be shut
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The pressure in the ventricles must exceed the pressure in the arteries
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The pressure in the arteries must exceed the pressure in the ventricles
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The atrioventricular valves must also be shut
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The atrioventricular valves must also be open
Pregunta 19
Pregunta
When pressure in the atrium exceeds pressure in the ventricle, this will cause
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The AV valve to close
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The AV valve to open
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The semilunar valve to open
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The semilunar valve to close
Pregunta 20
Pregunta
The volume of blood in the ventricle at the end of diastole is known as
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The end diastolic volume (EDV)
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The end systolic volume (ESV)
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The stroke volume (SV)
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The isovolumic volume
Pregunta 21
Pregunta
TRUE or FALSE During each cardiac cycle, the ventricle ejects the full volume of blood that it contains so there is no blood left in the ventricle at the end of systole
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- True
- False
Pregunta 22
Pregunta
Average stroke volume (SV) of a person at rest is approximately
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135 mL
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65 mL
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70 mL
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100 mL
Pregunta 23
Pregunta
Cardiac Output is a measure of the volume of blood pumped by one ventricle in a given period of time. It is equal to
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Heart rate X end diastolic volume (EDV)
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Heart rate X stroke volume (SV)
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Heart rate X systolic blood pressure
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Heart rate X total peripheral resistance
Pregunta 24
Pregunta
TRUE or FALSE Average resting heart rate is about 70 beats per minute due to tonic input from the sympathetic nervous system that keeps the heart rate lower than that which is set by the pacemaker cells
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- True
- False
Pregunta 25
Pregunta
If force of ventricular contraction is increased, what happens to stroke volume
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Decreases
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Increases
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Stays same
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It lowers heart rate
Pregunta 26
Pregunta
According to the Frank-Starling law, stroke volume (SV) increases as end diastolic volume (EDV) increases due to
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Increased sympathetic stimulation of the heart causing increased contraction of ventricles
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Increased stretch on myocardial cells due to increased EDV, resulting in increased contraction force
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Increased EDV causes increased heart rate and hence increased SV
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Venous return decreases with increased EDV so SV must be increased to compensate
Pregunta 27
Pregunta
What is venous return?
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The amount of blood ejected from a ventricle in one cardiac cycle
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The amount of blood that is pumped into the veins from the atria in one cardiac cycle
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The amount of blood that enters the heart from the veins each cardiac cycle
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The amount of blood that enters the systemic circulation each cardiac cycle
Pregunta 28
Pregunta
Which factors influence venous return?
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The skeletal muscle pump
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The respiratory pump
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Sympathetic innervation of veins
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All of the above
Pregunta 29
Pregunta
TRUE or FALSE When sympathetic neurons fire onto the heart, both heart rate and force of contraction are increased
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- True
- False
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