Questions and answers about the heart?

Answer 1

Look through the list and find your answers to lots of questions about the heart.________________________________________________________________Question one: What is the heart? Answer one: The heart is a organ that pumps blood around the body________________________________________________________________Question two: what is HR or heart rate? Answer two: Heart rate is how many times the heart beats per minuet________________________________________________________________Question three: What is maximal heart rate Answer three: Maximal heart rate is the highest number of times per minuet that the heart could contract._______________________________________________________________Question four: How many chambers does the heart have?Answer four: In a normal heart it contains four chambers two atria and two ventricles._____________________________________________________________Question five: What function does the atria and ventricles have? Answer: The right atrium pumps deoxygenated blood into the right ventricle. The left atrium pumps oxygenated blood in to the left ventricle. The left ventricle pumps oxygenated blood around the body through the aorta. The right ventricles pumos deoxygenated blood through the pulmonic valve to the lungs.______________________________________________________________Question six: What are heart valves and how do they work?Answer: There are four heart valves. The mitral valve is located between the left atrium and the left ventricle. The tricuspid valve is located between the right atrium and the right ventricle. The pulmonic valve is located between the right ventricle and the pulmonary artery. The aortic valve is located between the left ventricle and the aorta. The valves open and close in responce to changes in pressure within the chambers they connect to._____________________________________________________________Question seven: How many phases of the cardiac cycle are there? Answer: Many people think there are three phases to a heart beat. However there is FIVE phases: Phase one: Isovolumetric ventricular contraction: phases two: Ventricular ejection phase three: isovolumetric relaxation Phase four: ventricular filling phase five: Atrial systole______________________________________________________________Question eight: What is the sinoatrial node? Answer: The heart beats by electrical impulses. The sinoatrial node also known as the Sinus node, the SA node or the hearts pacemaker sends out electrical impulses 60- 100 times per minuet to make the heart beat. The sinus node is a collection of sevral thousand cells in the hearts right atrium_______________________________________________________________Question nine: What is sinus Rythme? Answer Sinus Rythme is when the heart is under direct control of the SA node_______________________________________________________________Question ten: What is AV node? Answer: The back-up pacemaker in the septum of the heart and it is in charge of delaying impulses by 0.4 seconds.______________________________________________________________Question eleven: What is the bundle of HIS? Answer: The bundle of HIS is another back-up pacemaker and is located in the hearts ventricles. It is found past the AV node and then it devides in to left and right bundle branches to the purkinje fibbers.______________________________________________________________Question twelve: What would happen if the SA node failed to discharge? Answer: If the SA node failed to discharge then other cells of the heart can take over as the pacemaker usally at a rate of 30- 60 times per minuet.______________________________________________________________Question thirteen: What is the discharge rate of the pacemakers of the heart? answer: The SA node = 60-100 The AV node 40-60 The purkinje network 30-40 times per minuet_____________________________________________________________There are many more questions I could answer please contact me with your questions via E-mailElliottcollins@hotmail.co.uk