Cardiovascular System Flashcards
The outer layer of the heart is the __________
Pericardium
The middle layer of the heart is the __________
Myocardium
The innermost layer of the heart is the __________
Endocardium
(1) A normal adult heart rate is __ - ___ bpm.
(2) Tachycardia is >___bpm
(3) Bradycardia is
(1) 60 - 100 bpm
(2) >100 bpm
(3) <60 bpm
What does depolarisation mean?
Contraction
The (1) ___ wave on an ECG represents atrial depolarisation and the (2) __ ____ is responsible for this
(1) P wave
(2) SA node
The P-Q segment on an ECG represents ___________ (long answer).
The time the signal travels from the SA node to the AV node.
The QRS complex on an ECG represents _______ ____________ - The AV node fires off electrical impulses down the bundle of His, through the right and left ventricular branches, ad through the purkinje fibres.
Ventricular Depolarisation (contraction).
The ____ wave on an ECG represents ventricles contracting and pump blood out
S-T
The T wave on an ECG represents _________ ____________
Ventricular Repolarisation
What does repolarisation mean?
Relaxation
The __________ is the thoracic cavity that the heart sits in.
Mediastinum
The ________ _____ is the right semilunar valve.
Pulmonary valve
The ______ _____ is the right atrioventricular valve.
Tricuspid valve
The _____ _____ is the left semilunar valve
Aortic valve
The ______ _____ is the left atrioventricular valve
Mitral valve
The ______ ________ is Fibrous cords of connective tissue that connect the papillary muscles to the tricuspid valve and mitral valve (AV valves). It stops the AV valves from letting blood flow back into the ventricles.
Chordae Tendinae
The pulmonary artery carries __________ blood
Deoxygenated
The pulmonary vein carries __________ blood
Oxygenated
The left and right (1) ________ ______ supply blood to the heart, more specifically the myocardium. They branch off from the (2) _____, just above the semilunar valves, and sit on top of the heart like a crown.
(1) Coronary arteries
(2) Aorta
Diastole = ______
Relax
Systole = _______
Contract
The first stage of the cardiac cycle: ______ ______ - All chambers are relaxed, they start to fill up with blood from the inferior and superior vena cavae (right), and from the pulmonary veins.
Cardiac Diastole
The second stage of the Cardiac cycle: _____ _______, __________ _________ -
Blood empties into the ventricles to equalise the pressure. Blood stops flowing when 70%ish of the blood is in the ventricles. The atria contract, pushing the other 30% into the ventricles.
The atria then relaxes, and the Ventricles contract, closing the AV nodes.
Atrial Systole, Ventricular Diastole