CardioVascular System

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  • Created by: Solz
  • Created on: 21-02-14 17:30
Identify the four components of the conduction system of the heart
Sinoatrial Node. Atrioventricular node. Bundle of His , Purkinje Fibres
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What is the cardiac cycle
Mechanical Events of one whole heart beat
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What are the four phases of the Cardiac Cycle
Atrial & Ventricular Diastole. Atrial & Ventricular Systole
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What happens in the Diastolic Phase
Diastole is the relaxation phase where the heart fills with blood.The Atrial Diastoles the tricuspid& bicuspid stays closed to increase pressure in atria.This forces them open and blood goes into ventricles.While ventricles fill, semilunar stay close
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Name two venous return mechanisms
Suction Pump.Respiratory Pump.Muscle Pump.One WAY pocket valves IN VEINS. Gravity
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Describe the Respiratory pump
Changes in pressure in thorax as you breathe in and out help draw blood back up to the heart
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What is cardiac output and what is the relationship with stroke volume
Amount of blood pumped out of the heart per minute. Q= Heart Rate X Strokevolume.
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What is the average heart rate
72 bpm
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Average stroke volume
70 litres
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What is end diastolic volume
Amount of blood left in the ventricles at the end of diastole (relaxation) phase
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Explain Starlings Law
Increased venous Return.More blood in the left ventricle.Left ventricle stretch more .This then allows a greater force of contraction. This causes increase Stroke volume and Ejection Fraction
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Define Ejection Fraction
Percentage of blood pumped out of the heart
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What is the effect of training on resting cardiac output and stroke volume
Cardiac output stays the same and Stroke Volume INCREASES
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Name some cardiovascular adaptations to training
Cardiac Hypertrophy.Increase in stroke volume.Reduction in resting heart rate.Inclease in End diastolic volume. Increased Venous Return.Increase in Red blood cells
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What does Anticipatory Rise Mean
A slight increase in heart rate PRIOR to exercise caused be release of ADRENALINE
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Name the 4 main receptors
Baro, Chemo,Proprio & Thermoreceptors
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What do chemoreceptors detect
Changes in blood PH caused by increase in C02
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Explain how rising levels of C02 cause an increase in CARDIAC OUPUT
Increase in acidity detected by chemoreceptors.IMPULSES sent to Medulla. Increased Stimulation of Sympathetic nerve.Increase in Heart rate &venous return.Increase in Stroke Volume/E fraction.Starlings Law
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Other cards in this set

Card 2

Front

What is the cardiac cycle

Back

Mechanical Events of one whole heart beat

Card 3

Front

What are the four phases of the Cardiac Cycle

Back

Preview of the front of card 3

Card 4

Front

What happens in the Diastolic Phase

Back

Preview of the front of card 4

Card 5

Front

Name two venous return mechanisms

Back

Preview of the front of card 5
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