1.1 Flashcards

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1
Q

4 key functions of the circulatory system

A

1) transports and delivers O2 and nutrients to the cells in exchange for CO2 and waste materials nutrients: minerals, vitamins, glucose 2) transports and delivers chemical messengers throughout the body chemical messenger: hormones 3) regulates body temperature 4) defends against disease

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2
Q

3 major components of the circulatory or cardiovascular system

A

heart blood vessels blood

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3
Q

in which direction is blood pumped? - from veins to arteries or - from arteries to veins

A

from arteries to veins

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4
Q

does the veins keep the blood moving in one direction?

A

yes

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5
Q

what connects arteries to veins

A

capillaries

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6
Q

are heart, arteries and veins all connected?

A

yes

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7
Q

cardiac output definition

A

volume of blood pumped by the heart PER minute

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8
Q

the greater the value of cardiac output (4)

A
  • the better the heart as a pump - the stronger the heart is as a muscle - the more fit the person is - the bigger the value of stroke volume
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9
Q

how to determine cardiac output

A

(stroke volume x heart rate)

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10
Q

stroke volume definition (2)

A
  • volume of blood pumped by heart PER beat - The quantity of blood pumped from the hearts left ventricle during each contraction PER beat
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11
Q

average stroke volume of adult … - male - female

A
  • male is 70 mL / beat - female is 60 mL / beat
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12
Q

the greater the value of stroke volume…(4)

A
  • the lower the value of RHR - the better the heart as a pump - the stronger the heart is as a muscle - the more fit the person is
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13
Q

RHR definition (1)

A

of contraction of the heart that occur PER minute while the body is at a complete rest

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14
Q

Heart rate definition

A
  • how many times the heart beats PER minute
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15
Q

Why does the heart rate vary?

A

The heart rate can vary according to the body’s physical needs, including the need to absorb oxygen and excrete carbon dioxide

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16
Q

What determines how effective the heart is as a pump

A
  • stroke volume (big value)
  • cardiac output (big value)

resting heart rate (small value

17
Q
A