Heart Flashcards
What is the location of the heart
Just left of centre
What is a function of the heart
To pump blood
What is circulated by the heart and used for functions
Oxygen
How many pumping chambers does the heart have ?
Two
What is the name of the upper chambers of the heart
Atrium
What is the name of the bottom chambers of the heart
Ventricles
What half receives blood from the body and pumps blood to the lungs
The right
What does the circulatory system consist of
Heart
Blood
Blood vessels
What is the hearts pace maker
The sinoatrial node
Where is the sa node located ?
In the wall of the right atrium
How many times does the myocardium contract
72 bpm
What does the aorta do?
Oxygen rich bloody to the body
Located at top of heart
What does the pulmonary artery do ?
Oxygen poor blood to the lungs
Located on the top left of heart
What does the pulmonary vein do
Oxygen rich blood from the lungs
Located below pulmonary artery on the left hand side of heart
What does the vena cava do
Take oxygen poor blood from the body
Located on right hand side of heart
What prevents the flow of blood back into the atria during ventricular contraction
The atrioventricular valve
What prevents the flow of blood back into the right and left ventricles during ventricle contraction
The semilunar valve
What is the ventricle contraction called
Systole
What is the ventricular relaxation called
Diastole
What are systole and diastol measurements of ?
Blood pressure
The pumping and contracting phase of the cardiac cycle
Systole
The relaxing resting phase of the cardiac cycle
Diastole
What is systemic circulation between?
The heart and the body
What are the systemic heart chambers
The left ventricle and right atrium
What is the systemic blood vessels
The aorta
The inferior and superior vena cava
What carry’s blood from the lower body
The inferior vena cava
What carry’s blood from the upper body
The superior vena cava
What is dark red in colour
Deoxygenated blood
What colour is oxygenated blood
Red
What is happening when the blood vessels narrow
Vasoconstriction
Which blood vessel has the thickest muscular walls and carry blood under high pressure
Arteries
What blood pressure reading 120 /80 be classified ?
Optimal
What are the 4 components in the blood vessels
Red
White
Platelets
Plasma
What does red blood cells do?
Carry oxygen
What do white blood cells do
Fight infection and destroy bacteria
Where do white blood cells produce
Red bone marrow
What cells assist in preventing blood loss
And help blood clotting
Platelets
What does plasma consist of
Water 91.5%
Solutes 8.5
What are arteries
Muscleluar thick walls
They contract and squeeze blood along the passageways away from heart
What is the large artery?
Aorta
Are there valves in the arteries
No
What carry’s deoxgyenated blood to the lungs
Pulmonary arteries and artiolies
What are extremely thin walls
Capillaries
What happens after the capillaries have passed the tissue ?
Form larger blood vessels called venules
Structure of blood vessels
Capillaries
Venules
Veins
Vena cava
What is the job of veins
Carrying blood from the tissues and back towards the heart
What do veins carry
Deoxygenated blood
What is blood vessels narrow
Vasoconstriction
What is blood vessels widen
Vasodilation
Where does the heart receive oxgygenated blood from
Pulmonary vein
Ocgygen rich blood from the lungs
Where does the heart pump deoxygenated blood to ?
To the lungs with the pulmonary artery
How many chambers does the heart have
4
Which chambers of the heart receive blood
Atrium
Which chambers of the heart pump blood
Ventricles
Largest vein entering the heart
Vena cava
What is oxygenated blood
Pulmonary vein
Left atrium
Left ventricle
Aorta
What is deoxygenated blood
Pulmonary artery
Right ventricle
Right atrium
Vena cava
What is blood pooling
Occurs in the veins pools in the extremities
Stopping suddenly during intense exercise
What is venous return
Helping the return flow of blood to the heart and preventing blood pooling
How is blood pressure measured
Cardiac output x total pheriihal resistance
What is vasoconstriction
Blood vessels narrow
What is vasodilation
Blood vessels widen