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Description
Flashcards by Gillian13990, updated more than 1 year ago
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Created by Gillian13990
about 9 years ago
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| Question | Answer |
| The Cardiovascular System | The cardiac muscle cells of the wall of the heart have a unique structure in that many of them are branched as that they together form an interconnected network. Thus, they are able to act as a single functional unit. |
| The Cardiac Cycle Is defined as... | ...the events of one heartbeat. |
| The Cardiac Cycle | It is important to notice that the events of this cycle depend on heart structure and the pressure of blood within the chambers and blood vessels. |
| The Cardiac Cycle | Each cardiac cycle takes approximately 0.8 seconds to complete: atrial systole - 0.1 seconds ventricular systole - 0.3 seconds atrial and ventricular diastole (relaxation period) - 0.4 seconds |
| The Electrocardiogram (ECG) 'The P Wave' | Atrial Depolarisation |
| The Electrocardiogram (ECG) 'The QRS Complex' | Ventricular Depolarisation |
| The Electrocardiogram (ECG) 'The T Wave' | Ventricular Repolarisation |
| Coronary Circulation | There are two large vessels - the left and right coronary arteries. |
| The left coronary artery supplies blood to... | ...the left ventricle |
| The right coronary artery supplies blood to the... | ...right side of the heart - including the important conducting tissues, the SA node and the AV node. |
| Coronary Circulation | Deoxygenated blood travels through the cardiac veins, to the coronary sinus, into the right atrium and joins the pulmonary circulation. |
| Coronary Circulation | It is during the relaxation period that the coronary vessels have time to pump blood around the heart. |
| Blood Pressure | When the heart rate increases - the period of diastole shortens, which decreases blood flow. |
| Blood Pressure is defined as... | the pressure exerted by the blood on the wall of a vessel. |
| Blood Pressure is highest... | ...in the blood vessels closest to the heart (pulmonary trunk and aorta). |
| Blood pressure refers to... | ...The pressure in the large arteries of the systemic circulation. |
| What is the typical value for a systolic pressure in young men? | 120mmHG |
| What is the typical value for a diastolic pressure in young men? | 80mmHg |
| What is the typical value for a systolic pressure in young women? | 110mmHg |
| What is the typical value for a diastolic pressure in young women? | 70mmHg |
| The TWO determinants of blood pressure are... | Cardiac Output and Peripheral Resistance |
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