EEMB 50 Non Infectious Diseases
EEMB 50 Non Infectious Diseases
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This 2 page Reader was uploaded by Gabriela Lopez on Friday April 25, 2014. The Reader belongs to a course at University of California Santa Barbara taught by a professor in Fall. Since its upload, it has received 73 views.
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Date Created: 04/25/14
EEMB 50 Lecture 10 April 21 2014 The Human Heart An Owner s Manuel Fun Facts 1 72 beats per min 2 100000 beats per day 3 35 million beats per year 4 3 billion beats per lifetime Heat disease is only slightly ahead of cancer Majority of hearts that fail don t follow our owner s manual Smoking high blood pressure and other causes lead to heart failure and other problems with the heart Our idea of the heart shape deals With love People think some animal hearts resemble human hearts The heart has four different chambers the LR Ventricles and LR atriums The Left Ventricle is more muscular than the right because it pumps blood to the body and therefore requires more strength to do so Blood coming from the body goes to the right atrium then Ventricle which will pump it to the lungs and become oxygen rich The blood then goes to the left atrium and into left Ventricle Where it will be pumped to the body Arteries carry blood away from the heart going to the lungs and body oxygen poor blood Veins carry blood to the heart oxygen rich blood The heart has Valves and they are needed to ensure blood moves in one direction and it doesn t ow back from where it came from The AV Valves separate the atrium and Ventricles When the semilunar Valves close they produce the second heart beat after AV Valves close Systole contraction of the heart muscle Diastole relaxation of the heart muscle When the heart is contracting it is working the hardest because it is pumping blood to the body When they Ventricles are relaxed they are being filled with blood before they begin pumping Heart Valves can fail Heart murmur blood ows back to atrium and the Valve is swinging around This makes the heart less efficient and the heart works harder When you go to the doctor and they cuff your arm they do not listen to your heart but to the sound caused by the high blood pressure after the cuff is released slowly The heart has an intemal pacemaker that initiates the electrical signaling between the chambers of the heart without the intervention of the Nervous System Each electrical signal begins in the sinus node and then continues to the atria Ventricular node The combined contraction of the atria and Ventricles is the heartbeat The body can control heart beat by changing the membrane potential and altering the permeability of cells to certain ions A hole in the heart refers to a hole between the 2 Ventricles and is also known as Ventricular Septal Defect It results in a oxygen poor blood from the right Ventricle to mix with oxygen rich blood in the left Ventricle this blood owing through the lungs causes an extra noise known as a heart murmur
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