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20 Cards in this Set
- Front
- Back
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What is the basic function of circulation and gas exchange?
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To provide the body with
oxygen nutrients And remove wastes & CO2 |
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What is the reason for having a circulatory system?
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All cells in the body need access to oxygen
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What is an open circulatory system?
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There are blood vessels but no capillaries
So, the heart beats and fluid goes into large vessels and into the body |
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Who has an open circulatory system?
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Insects and many arthropods
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what is a closed circulatory system?
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When blood is always confined to blood vessels
& Small blood vessels are present throughout the tissues so blood can get to all parts of the body |
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who has a closed circulatory system
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humans, cephalopods, earthworms, and vertrebates
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How many parts is the heart composed of and what are they?
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The heart is composed of AT LEAST two parts : an atrium and a ventricle
but higher vertebrates might add to this with two atria instead of one |
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How is the blood pumped out from the heart?
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The heart's atrium receives blood from the body and then moves it to the VENTRICLE and then OUT the heart
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What is the flow of blood in mammals?
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Right V to the Lungs
to the Left Atrium to the L.V to the Body then to the R.A to the R.V |
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look at the blood flow for the fetus
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in the notes !
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Blood going INTO the lungs is in the ____ circuit
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Pulmonary Circuit
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Blood going to the body is in the ______ circuit
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systematic circuit
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What is the cardiac cycle?
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What happens from on heart contraction to the next
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What is heart rate?>
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# of times the heart beats in one
minute beats per min avg is 70 |
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What is the stroke volume?
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amount of blood pumped by the LV with one beat
75ml per beat |
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What is the cardiac.output?
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The amount of blood that is pumped by the LV in ONE MINUTE
5.25 L in humans |
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What are the steps in the cardiac cycle?
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Systole (contraction phase)
Diastole (relaxation phase) |
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What happens when the AV valve closes?
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When the AV valve closes in step 3, a LUB sound is produced
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What happens when the semilunar valves close?
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When the semilunar valves close, a DUB sound is produced
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What causes a heart murmur?
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By a backflow of blood against the valves
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