Topic 3B- More Exchange and Transport Symptoms Flashcards

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1
Q

what vessel carries blood away from the heart

A

arteries

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2
Q

do arteries have thick walls

A

yes

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3
Q

what type of blood do arteries carry

A

oxygenated

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4
Q

what is the only artery that carries deoxygenated blood

A

pulmonary artery

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5
Q

what do arteries divide up into

A

arterioles

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6
Q

what do the muscles in arterioles do

A

control direction where blood is demanded

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7
Q

what is the widening of the lumen

A

vasodilation

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8
Q

what is the lumen getting smaller

A

vasoconstriction

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9
Q

where do veins carry blood to

A

back to the heart

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10
Q

do veins have a small lumen

A

no, it’s wider than arteries

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11
Q

what has more elastic tissue for stretch and recoil to maintain pressure

A

arteries

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12
Q

do veins have valves, if so why

A

yes, to prevent backflow when going against gravity to the heart

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13
Q

what type of blood do veins carry

A

deoxygenated

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14
Q

do veins have muscle surrounding them, if so why

A

yes, this is to aid the low pressure blood back to the heart against gravity

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15
Q

what do arterioles branch into

A

capillaries

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16
Q

what is the smallest blood vessel

A

capillaries

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17
Q

why are capillary’s good for exchanging substances between cells and capillaries

A

they are 1 cell thick

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18
Q

what are capillary beds

A

network of capillaries in tissue

19
Q

why is there a large number of capillaries

A

increase surface area for exchange

20
Q

example of capillaries lining cells

A

surrounding the alveoli for gaseous exchange

21
Q

where does photosynthesis happen

A

chloroplasts

22
Q

what does the phloem transport

A

solutes- minerals and inorganic ions

23
Q

why does the phloem transport solutes and what is the process called

A

for metabolic process and translocation

24
Q

why do cells require glucose

A

for respiration

25
Q

do all cells need the same amount of glucose

A

no the amount depends on their function and whats its then used for

26
Q

what are the 3 main components of a phloem structure

A

sieve tube elements, end plates and companion cells

27
Q

what are sites of production within a plant called

A

sources

28
Q

where from the pants sources are the substances taken

A

sinks

29
Q

how are sugars in a plant produced

A

photosynthesis

30
Q

what does the mass flow theory rely on for movement

A

pressure gradients

31
Q

(at source) phloem loading

in the mass transport theory, when the source pruduces sugar, what does this do to the concerntration

A

increases it

32
Q

(at source) phloem loading

in the mass transport theory, how does the sugar move from the leaf cell to the companion cell

A

facilitated diffusion

33
Q

(at source) phloem loading

in the mass transport theory, what does the cell actively transport into the sieve tube elements from companion cells

A

hydrogen ions

34
Q

(at source) phloem loading

in the mass transport theory, how does the sugar get into the S.T.E from companion cells

A

co-transport with H+ ions

35
Q

(at source) phloem loading

in the mass transport theory, what happens to the water potential in the phloem once the sugar has been pumped into the phloem

A

decreases

36
Q

(at source) phloem loading

in the mass transport theory,due to a lower water potential in the phloem what does this cause to happen

A

osmosis from the xylem into the phloem

37
Q

phloem loading (at source)

in the mass transport theory, as osmosis has happened into the cell what does this cause the hydrostatic pressure to do

A

increase

38
Q

in the mass transport theory, how do sugars move from companion cells into leaf cells (sinks)

A

facilitated diffusion and probably active transport

39
Q

in the mass transport theory, how do sugars move out of the S.T.E into the companion cells

A

facilitated diffusion and active transport

40
Q

in the mass transport theory, when the sugars move OUT of the phloem what happens to the water potential

A

increases

41
Q

in the mass transport theory, what is the result of the water potential increases in the phloem near the sink

A

water moves out by osmosis into the xylem

42
Q

in the mass transport theory, when water moves out of the phloem into the xylem, what decreases

A

hydrostatic pressure

43
Q

in the mass transport theory, what is the significance of having a high pressure at the source and low pressure at the sink

A

creates a gradient, this results in movement as the substances go down the pressure gradient

44
Q
A