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Topic 20 - Cardiovascular Physiology

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Physiology Quiz sobre Topic 20 - Cardiovascular Physiology, criado por Felicity B em 11-10-2017.
Felicity B
Quiz por Felicity B, atualizado more than 1 year ago
Felicity B
Criado por Felicity B quase 7 anos atrás
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Resumo de Recurso

Questão 1

Questão
A blood vessel that takes blood away from the heart is called a/an
Responda
  • Artery
  • Vein
  • Capillary
  • Ventricle

Questão 2

Questão
The heart chamber that pumps oxygen depleted blood to the lungs is the
Responda
  • Right atrium
  • Right ventricle
  • Left atrium
  • Left ventricle

Questão 3

Questão
The systemic circulation
Responda
  • Begins with oxygen rich blood entering the aorta
  • Supplies blood to all tissues of the body
  • Ends with oxygen depleted blood entering the right atrium
  • All of the above

Questão 4

Questão
Cardiac muscle cells are electrically connected via
Responda
  • Desmosomes
  • Gap junctions
  • Striations
  • Motor units

Questão 5

Questão
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
Responda
  • True
  • False

Questão 6

Questão
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
Responda
  • True
  • False

Questão 7

Questão
TRUE or FALSE All cardiac muscle cells can spontaneously generate action potentials.
Responda
  • True
  • False

Questão 8

Questão
In myocardial autorhythmic cells (pacemaker cells), when threshold is reached the action potential fires because
Responda
  • Voltage gated sodium channels open and sodium rushes into the cell
  • Voltage gated calcium channels open and calcium rushes into the cell
  • Voltage gated potassium channels open and potassium rushes out of the cell
  • Increased leaky channels open and there is net sodium influx

Questão 9

Questão
In pacemaker cells, decreased permeability to calcium will
Responda
  • Increase heart rate
  • Decrease heart rate
  • Have no effect on heart rate
  • Increase force of muscle contraction

Questão 10

Questão
Parasympathetic nervous stimulation onto pacemaker cells results in
Responda
  • Increased heart rate
  • Decreased heart rate
  • No change in heart rate
  • Increased force of muscle contraction

Questão 11

Questão
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
Responda
  • True
  • False

Questão 12

Questão
1. In a normally functioning heart the pacemaker cells are in the
Responda
  • Sinoatrial (SA) node
  • Atrioventricular (AV) node
  • Autonomic nerves
  • Purkinje fibres

Questão 13

Questão
TRUE or FALSE In a normal cardiac cycle, the ventricles contract first, followed by the atria
Responda
  • True
  • False

Questão 14

Questão
In an ECG reading, the T wave represents
Responda
  • Depolarisation of the atria
  • Depolarisation of the ventricles
  • Repolarisation of the ventricles
  • Force of contraction

Questão 15

Questão
1. The relaxation phase of the cardiac cycle is called
Responda
  • Diastole
  • Systole
  • Depolarisation
  • Isovolumic ventricular contraction

Questão 16

Questão
During the cardiac cycle the phase when the ventricles are contracting and blood is being ejected into the arteries is called
Responda
  • Diastole
  • Systole
  • Depolarisation
  • Isovolumic ventricular contraction

Questão 17

Questão
When the atrioventricular valves are open
Responda
  • Blood is flowing from the ventricles into the atria
  • Blood is flowing from the atria into the ventricles
  • Blood is being ejected from ventricles into arteries
  • Blood is being ejected from atria into veins

Questão 18

Questão
In order for the semilunar valves to be shut
Responda
  • The pressure in the ventricles must exceed the pressure in the arteries
  • The pressure in the arteries must exceed the pressure in the ventricles
  • The atrioventricular valves must also be shut
  • The atrioventricular valves must also be open

Questão 19

Questão
When pressure in the atrium exceeds pressure in the ventricle, this will cause
Responda
  • The AV valve to close
  • The AV valve to open
  • The semilunar valve to open
  • The semilunar valve to close

Questão 20

Questão
The volume of blood in the ventricle at the end of diastole is known as
Responda
  • The end diastolic volume (EDV)
  • The end systolic volume (ESV)
  • The stroke volume (SV)
  • The isovolumic volume

Questão 21

Questão
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
Responda
  • True
  • False

Questão 22

Questão
Average stroke volume (SV) of a person at rest is approximately
Responda
  • 135 mL
  • 65 mL
  • 70 mL
  • 100 mL

Questão 23

Questão
Cardiac Output is a measure of the volume of blood pumped by one ventricle in a given period of time. It is equal to
Responda
  • Heart rate X end diastolic volume (EDV)
  • Heart rate X stroke volume (SV)
  • Heart rate X systolic blood pressure
  • Heart rate X total peripheral resistance

Questão 24

Questão
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
Responda
  • True
  • False

Questão 25

Questão
If force of ventricular contraction is increased, what happens to stroke volume
Responda
  • Decreases
  • Increases
  • Stays same
  • It lowers heart rate

Questão 26

Questão
According to the Frank-Starling law, stroke volume (SV) increases as end diastolic volume (EDV) increases due to
Responda
  • Increased sympathetic stimulation of the heart causing increased contraction of ventricles
  • Increased stretch on myocardial cells due to increased EDV, resulting in increased contraction force
  • Increased EDV causes increased heart rate and hence increased SV
  • Venous return decreases with increased EDV so SV must be increased to compensate

Questão 27

Questão
What is venous return?
Responda
  • The amount of blood ejected from a ventricle in one cardiac cycle
  • The amount of blood that is pumped into the veins from the atria in one cardiac cycle
  • The amount of blood that enters the heart from the veins each cardiac cycle
  • The amount of blood that enters the systemic circulation each cardiac cycle

Questão 28

Questão
Which factors influence venous return?
Responda
  • The skeletal muscle pump
  • The respiratory pump
  • Sympathetic innervation of veins
  • All of the above

Questão 29

Questão
TRUE or FALSE When sympathetic neurons fire onto the heart, both heart rate and force of contraction are increased
Responda
  • True
  • False

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