Level 6 Level 8
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A thin walled and elastic chamber in the heart. The atria receive blood from the veins.
A thick walled muscular chamber in the heart. The ventricles receive blood from the atria.
The valves in the heart that stop blooding flowing backwards from the ventricle into the atrium
Valves between the ventricles and arteries that prevent blow flowing back into the ventricles
A sequence of events that results in the pumping of blood round the body
The atrioventricular valve on the left side of the heart. It is made up of two cup-shaped flaps.
The atrioventricular valve on the right side of the heart. It is made up of three cup-shaped flaps.
Blood pressure is a measurement of the force applied to the walls of the arteries as the heart pumps blood through the body.
The volume of blood pumped by one ventricle of the heart in one minute. Cardiac output = heart rate x stroke volume
The regular throbbing of the arteries, caused by the successive contractions of the ventricles within the heart
A disease of the heart of blood vessels
Coronary heart disease
A narrowing of the small blood vessels that supply blood and oxygen to the heart.
The chest cavity
The artery that is connected to the left ventricle and which carries oxygenated blood to all parts of the body except the lungs
The vein that is connected to the right atrium and that brings deoxygenated blood back from the body.
This artery is connected to the right ventricle and carries deoxygenated blood to the lungs.
This vein is connected to the left atrium and brings oxygenated blood back from the lungs.
Blood vessels which branch of the aorta and supply the cardiac muscle
The phase of the cardiac cycle where the muscular walls of the heart are relaxed allowing blood to flow into the atria
The phase of the cardiac cycle where the atria contract and force blood into the ventricle.
The phase of the cardiac cycle where the ventricles contract and force blood out into the arteries
Valves in veins that ensure, when the veins are squeezed by contaction of surround skeletal muscle, blood is pushed towards the heart and cannot flow backward
The rate at which the heart beats
The volume of blodd pumped out of the heart each time it beats
A fatty deposit within the wall of an artery
The sequence of amino acids in a protein
Transport cholesterol from the liver to the tissues.
An atheroma which has grown to form an irregular patch
The presence of beta pleated sheets and alpha helixes
A blood clot
The 3D structure of a protein
The interaction between more than one polypeptide
Remove cholesterol from tissues and transport it to the liver for excretion.
High Affinity of haemoglobin
Oxygen binds more easily to haemoglobin but is given up less readily
A substance such as vitamin C or E that removes potentially damaging oxidizing agents in a living organism.
Oxygen binds less easily to haemoglobin but is given up more readily
The measurement of the electrical changes that occur in the heart during the cardiac cycle
The process by which haemoglobin combines with oxygen
The process in which haemoglobin releases its oxygen
Oxygen Dissociation Curve
A graph that shows the relationship between oxygen concentration in the environment and the percentage saturation of haemoglobin molecules
A polymer that binds to cellulose fibers and hardens and strengthens the cell walls of plants