Section 1: Applied Anatomy and physiology Flashcards
What are the four chambers of the heart
Right atrium///Left atrium
Right ventricle/// Left ventricle
What is the role of the heart
To pump blood around the body for the transportation of Oxygen
What are the blood vessels of the heart and what are their roles
Vena Cava - Delivers deoxygenated blood back to the right atrium.
Pulmonary vein - Delivers oxygenated blood to the left atrium
Pulmonary artery - Leaves the right ventricle with deoxygenated blood to go to the lungs
Aorta - Leaves the left ventricle with oxygenated blood leading to the body
What is the order that the impulse travels in for the cardiac conduction system
Sinoatrial node Atrial systole Atrioventricular node Bundle of his Purkinje fibres Ventricular systole
What is the difference between the parasympathetic and sympathetic systems
Parasympathetic - Decreases heart rate
Sympathetic - Increases heart rate
What are the three receptors and what are their roles
Chemoreceptors - Detects changes in blood acidity levels. (Increase in carbon dioxide levels would mean an increased heart rate)
Barorecptors - Detects changes in blood pressure. (Increase in blood pressure means decrease in heart rate)
Propriorecptors - Detect changes in muscle movement (Increase in muscle movement means increase in heart rate)
What is Starlings law
Increased venous return => Greater diastolic filling of the heart=> Cardiac muscle stretched => More force of contraction => Increased ejection fraction.
What is the formula to work out cardiac output
Cardiac output = Stroke volume X Heart rate
Example
Q = 70ml X 72BPM
Q = 5040ml (5.04L)
How do you work out Maximum heart rate
220 - Age
Example
220 - 18 = 202
18 year old has a maximum heart rate of 202
What is Cardiac hypertrophy and Bradycardia
Cardiac hypertrophy - Thickening of the muscular wall of the heart so it becomes bigger and stronger
Bradycardia - A decrease in resting heart rate to below 60 beats per minute
Describe the problems that someone may experience if they don’t exercise regularly
Heart disease - When your coronary arteries become blocked so they are unable to deliver enough oxygen to the heart. If a piece of fatty deposit breaks off it could cause a blood clot which will cause a heart attack.
High blood pressure - The force exerted by the blood against the blood vessel wall. Higher blood pressure puts extra strain on the arteries and cause you to have a heart attack.
Cholesterol - Lack of exercise could mean there would be more Low density lipoprotiens which are seen as bad cholesterol than high density lipoprotiens which are seen as good cholesterol.
Stroke - This is when the blood supply to the brain is cut off causing damaging to brain cells which cause them to die. This can be done as either when a blood clot stops the flow or if a blood vessel supplying blood to the brain bursts.
What is Cardiovascular drift
Cardiovascular drift occurs after a period of exercise (After 10 minutes) => Heart rate increases => Stroke volume decreases => Because fluid lost as sweat => Resulting in a reduced plasma volume => Reduced venous return => Cardiac output also increases due to more energy needed to cool body/sweat.
What are the two types of circulation
Pulmonary - Deoxygenated blood from the heart to the lungs and oxygenated blood back to the heart
Systemic - Oxygenated blood to the body from the heart and then the return of deoxygenated blood from the body back to the heart.
What factors aid venous return
Stretched muscle pump - When muscle contract and relax they change shape. This change in shape means the muscles press on the nearby veins and cause a pumping effect and squeeze the blood towards the heart.
The respiratory pump - When muscles contract and relax during breathing i n and out pressure changes occur in the chest and stomach cavities. these changes in pressure compress the nearby veins and assist blood return to the heart.
Pocket valves - It is important that blood in the veins only flows in one direction. The presence of valves ensures that this happens. This is because once the blood has passed through the valves, they close to prevent the blood flowing back
What impact does blood pressure have on venous return
When systolic pressure increases there will also be an increase in venous return. If systolic pressure decreases then venous return would also decrease.