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36 Cards in this Set
- Front
- Back
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systole
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contraction of heart muscle (atria or ventricle)
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diastole
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relaxation of heart muscle
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what is the heart controlled by
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the autonomic nervous system (doesn't need it to beat)
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what is the hearts nervous system called
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The sinoatrid node (fires once a second)
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what can the SA node be replaced by
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pacemaker
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parasympathetic nervous system
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time for rest, slow things down
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symphathetic nervous system
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for active, the fight or flight response, more activity more heart beats
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explain the cardiac cycle involving tissues
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1. SA node fires SA node passes into both atriums
2. L&R atria contract pushing blood into ventricles 3. SA node signal also activates the AV node to fire 4. The AV node sends the signal to the AV bundle (located in septum) 5. The AV bundle passes the signal onto the purkinje fibers which cause the ventricles to contract |
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what does the LUBB sound mean
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AV valve close as ventricles contract
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what does the DUBB sound mean
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sound made when the semilunar valve close (when ventricles relax)
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what is blood
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55% plasma, 45% formed elements
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what is formed elements
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99% RBC 1% WBC and Platelets
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what is plasma
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90% water 7% plasma proteins 3% gases salts nutrients nitrgenous wastes hormones vitamins
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what is a erythrocyte
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RBC no nucleus, made in long bones, life span of 120 days recycled in spleen, liver, not enough = anemia
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what is a leukocytes
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fight infection
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what is a thrommbocytes
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platelets, help blood to clot
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what is a vein
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bring blood back to heart, usually carry oxygen poor blood/ nutrient poor blood have thin walls very little muscle and they contain valves
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what is an artery
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takes blood away from heart, usually oxygen rich blood/nutrient rich bloog they are thick and wall muscled
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what is the superior vena cava
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collects oxygene poor blood from the upper blody, attaches to the right atrium
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what is the inferior vena cava
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collects oxygene poor blood from the lower regions of your body. attaches to the right atrium
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what is the right atrium
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contains oxygene poor blood and all blood returning from the blody enters the heart here
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what is the right ventricle
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contains oxygene poor blood. it receives blood from the right atrium them pumps blood to lungs, less muscular than the left ventricle
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what is the tricuspid valve (AV valve)
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atrioventricular valve, separates the right atrium and right ventricle has 3 flaps of tissue and prevents back flow of blood
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what is the pulmonary semilunar valve
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a valve which separates the right ventricle and prevents back flow fro mthe pulmonary artery into right ventricle
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what is the pulmonary arteries
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*********************************************
only artery which carries oxygene poor blood in an adult human, carries blood from right ventricle to the lungs |
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what is the pulmonary veins
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*********************************************
only veins in an adult human that carries oxygene rich blood, brings blood back to the heart and emptys into the left atrium |
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what is the left atrium
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oxygene rich blood returning to the heart from lungs enters here
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what is the bicuspid valve (AV valve)
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valve between left atrium and left ventricle and prevents back flow of blood
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what is the left ventricle
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muscular oxygene rich blood and pumps blood to our body
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what is the aortic semi lunar valve
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valve between the left ventricleand aorta and prevents back flow
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what is the aorta
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largest artery in the body carries oxygene rich blood
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what is the aortic arch
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top portion of aorta where it cures and there are 3 off shouts
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what are coronary arteries
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provides oxygene rich blood to the heart muscle
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what is myocardium
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the heart muscle
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journey of the RBC
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SUPERIOR/INFERIOR VENA CAVA - right atrium - tricuspid - right ventricle -pulminary semi lunar valve - pulmonary arteries - lungs - pulmonary veins - left atrium - bicuspid valve - left ventricle - aortic semilunar - aortic trunk
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what happends to a baby at birth
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the lungs inflate and change chest presuure, a flap of tissue in theleft atrium falls and covers the foramen ovule
ductus arteriorsis fills with a fatty gel within 2 weeks |
