The Heart Flashcards
What is the thickness like of the atria and why?
Walls are thin with little amount of muscle because they are only pumping blood to the ventricles below.
What are the ventricle walls like?
Thicker than the atria but the left ventricle is thicker because it pumps blood around the body in aorta
Which side of the heart is for oxygenated blood
Left but on a diagram right
Which ventricle pumps blood to the lungs
Right ventricle
Which side of the heart is under more pressure
Left side
In a heat beat, does the atria or ventricle contract first?
Atria just before
What stops valves being turned inside out when ventricle contract?
Tendons supporting the valves
What is the valve found between the right atrium and right ventricle?
Tricuspid
What general term is sometimes used to describe both set of valves?
Atrioventricular valves
What muscle contracts and releases to pump blood around the body
The heart
What factors could change heart rate?
Can change during exercise and influence of adrenaline
What is the heart made of?
Cardiac muscle
The valve between the left atrium and left ventricle is the
Bicuspid
What factors could lead to heart disease
Blockages in cardiac/ coronary blood supply caused by fat deposits which can also occur in other blood vessels
Lifestyle such as lack of exercise, stress, diet with too much fat, smoking and gentle disease
Why is cardiac muscle special?
It never gets tired and contracts and releases regularly throughout life
Why is blood pumped around the body at such high pressures?
Because blood must always be able to reach all tissue of the body, and must still be able to reach finger tips when arms are raised
How many chambers does the heart have
4
When the ventricles contract what do the atrioventricular valves do?
Slam shut
What is the septum for?
To separate the right and left side of heart ensuring that deoxygenated and oxygenated blood don’t mix
Where does the right atrium draw blood from?
The vena cava
Where does the left atrium draw blood from
The pulmonary vein
Do arteries pump blood too or from the heart
From
How is blood pumped to the heart
Through the veins
