B2.2 - Key Words

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Alveoli

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21 Terms

1

Alveoli

Air sac in the lung which increases the surface area

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2

Artery

Blood vessel that carries blood away from the heart

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3

Atria

Upper chamber of the heart (singular - atrium)

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4

Capillary

Small blood vessels that carry blood close to all cells in the body. They link arterioles and venules

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5

Diffusion distance

Distance over which a molecule diffuses

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6

Double circulatory system

A system in which blood travels through the heart twice in each circuit of the body

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7

Exchange surface

An area where materials are interchanged

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8

Heart

Muscular organ which pumps blood around the body

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9

Lumen

The open channel within a tube

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10

Phloem

Tissue that transports dissolved sugar around a plant

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11

Potometer

Apparatus used to measure rate of water uptake in a plant

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12

Semipermeable membrane

A membrane which only allows certain molecules to pass through it

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13

Stomata

Small openings (pores) in a plant’s epidermis used to exchange gases (singular - stoma)

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14

Translocation

Movement of sugars from the leaf to stores in the roots, or to growing areas of a olant

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15

Transpiration

Loss of water form the leaves of a plant

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16

Transpiration stream

The flow of water through a plant caused by the loss of water from a plant’s leaves

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17

Valve

Structure that controls the direction of flow

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18

Vein

Blood vessel that carries blood towards the heart

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19

Ventricle

Lower chamber of the heart

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20

Villi

Finger-like projections on the intestine wall, which increase the surface area

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21

Xylem

Tissue that transports water around a plant

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