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17 Cards in this Set
- Front
- Back
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When taking someone's BP, what would you record the systolic heart rate to be?
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After inflating the cuff to where NO sound is heard by the stethoscope, the pressure in the cuff is reduced "just below" the peak where an intermittent passage of blood through the partially opened artery causes a soft "tapping" sound. The systolic pressure.
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When the tapping sound you hear after more pressure is released, becomes muffled and the cuff pressure is reduced even further, the flow of blood will be easier and there will be fewer "rushing" sounds or turbulence. When the cuff is no longer occluding the artery, the sounds will cease. What is the pressure at this moment?
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Diastolic.
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What would the tapping sound heard by a sphygomommenometer when taking someone's BP be from?
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caused by opening and closing of brachial artery.
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What is known as the silent killer when it comes to BP?
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hypertension, many people have it, but they don't know until something goes wrong.
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As a Roger the red blood cell is traveling away from the heart, he suddenly decelerates, why would he suddenly slow down?
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There is an increased number of branching arterioles and capillaries that provide increased area for the passage of blood. INCREASED X-SECTIONAL AREA (just like on the river :) )
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Why would it be beneficial for blood to move slowly through capillaries?
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To allow time for gas exchange.
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What 2 mechanisms cause varicose veins?
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Excessive stretching by overfilled veins and as the vein expands, vein valves become distended and fail to function.
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What contributes to varicose veins?
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obesity, sedentary lifestyle, female gender, genetic predisposition, and increasing age
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How can pregnancy cause varicose veins?
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The fetus in the abdomen compresses the large abdominal veins, the leg veins can't properly drain and the valves malfunction.
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Roger the Red blood cell suddenly decreases his velocity, he then picks up movement, after passing through some structures, why would this happen?
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He reached a X-sectional area of capillaries which caused him to slow down, after he passes from the arteriole to the venule the X-sectional area decreases. Also, the skeletal muscle pump and the respiratory pump are acting on him and the blood cells around to speed up.
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Venous return is dependent upon what 3 factors?
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How well the Skeletal muscle pump, the respiratory pump, and the one-way valves work on returning blood flow towards the heart.
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how can exercising get blood moving better?
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exercising causes skeletal muscles to contract, they compress the weak walls of the veins which causes the blood to move past a valve, once past this point it can't go backwards.
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How could fainting occur in a person who is standing too long? How is fainting a preventative mechanism?
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If the person isn't constantly contracting their muscles, blood can collect in the limbs, depriving the brain of needed oxygen.
Fainting puts you horizontal which aids in getting blood to the head. |
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How is the respiratory pump a mechanism for getting venous blood back to the heart?
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Inhale: chest expands, this reduces pressure in the thoracic cavity. Blood flows form high pressure (in abdominal cavity) to low pressure (in thoracic cavity). When we exhale, the pressure reverses, but the valves in the veins prevent backward flow.
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If blood is stuck in the abdominal cavity, why would it be there, and what will push it into the thoracic cavity?
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When we inhale, the chest expands creating a lower pressure in the thoracic cavity; because blood flows from areas of higher to lower pressure, the higher pressure in the abdominal cavity pushes it into the thoracic.
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When the respiratory pump is in action, during inhalation, blood flows from an area of higher pressure (in the abdominal cavity) to the area of lower pressure (thoracic cavity), what happens when we exhale?
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The pressure reverses, but the valves in the veins prevent backward flow.
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Which veins do not have one-way valves?
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The great veins (the vena cavae)
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