Cardiovascular System Flashcards
What is the order of the Cardiac Conduction System?
1) SAN
2) Atrialsystole
3) AVN
4) Bundle Of His
5) Purkinje Fibres
6) Ventricular Systole
What does Myogenic mean?
The heart muscle is myogenic because it generates its own electrical impulse.
What is Heart Rate (HR)
The number of beats of the heart per minute
What is stroke volume
The number of blood ejected from the left ventricle per minute
What is Cardiac Output?
The volume of blood ejected from the left ventricle per minute
What is the cardiac output equation
Cardiac Output (Q) = Stroke Volume (SV) X Heart Rate (HR)
What is systole
The contraction phase of the cardiac muscle
What is diastole
The relaxation phase of the cardiac muscle.
What does a vein do?
Takes blood to the heart
What does an artery do?
Takes blood away from the heart
What do capillaries do?
Hold blood, 1 cell thick
3 features of an artery
Thick muscular walls
High blood pressure
Takes blood away from the heart
2 features of Capillaries
One cell thick
Gaseous exchange
5 features of veins
Thinner Muscular Walls
Larger Lumen
Lower Blood Pressure
Takes blood back to the heart
Contains valves
What are the 5 Venous Return Mechanisms?
The Respiratory Pump
Gravity
The Skeletal Muscle Pump
Smooth Muscle
Pocket Valves
What controls the redistribution of blood flow from one area to another?
The Vascular Shunt Mechanism
In the Vascular shunt mechanism, what controls the blood flow into the capillaries?
Pre-Capillary Sphincters
What 2 things can Pre-Capillary Sphincters do?
Constrict - limits blood flow through beds
Dilate - Maximises blood flow into beds
What part of the brain does Vasomotor Control take place?
Medulla Oblongata
