B2a Animal & Plant Tissues

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What is a tissue?
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A group of similar cells that work together to perform a specific function
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What is an organ?
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A group of tissues performing specific functions

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39 Terms

1
What is a tissue?
A group of similar cells that work together to perform a specific function
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2
What is an organ?
A group of tissues performing specific functions
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3
What is an organ system?
A group of organs working together to form an organism
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4

Give examples of tissues

muscle tissue, nervous tissue

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5

Give examples of organs

heart, stomach, brain

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6

Give examples of organ systems

digestive system, nervous system

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7

What does the digestive system do?

Breaks down and absorbs food

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8

What are enzymes?

They are large molecules (proteins) which act as biological catalysts in living organisms

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9

Why do enzymes usually only speed up one reaction?

the shape of the enzyme's active site only matches the reactants for one reaction

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10
What do digestive enzymes do?
convert food into small soluble molecules that can be absorbed into the bloodstream
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11

How would you test food to see if it contains sugars?

Using the Benedict's test. A + result will be yellow-orange

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12

How would you test food to see if it contains starch?

The iodine test. A + result will be black-purple.

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13

How would you test food to see if it contains protein?

Using the Biuret Reagent test. A + result will be a shade of purple.

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14
What does the heart do?
pump blood around the body
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15

What are the blood vessels that carry blood away from the heart called?

The aorta and the pulmonary artery

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16
Where does the right ventricle of the heart pump blood to?
to the lungs where gas exchange takes place
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17
Where does the left ventricle of the heart pump blood to?
around the rest of the body
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18

Why does the heart have valves?

to make sure blood flows in the right direction (stop it flowing backwards)

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19
How is our heart rate controlled?
by a group of cells located in the right atrium that act as a pacemaker
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20
How are the lungs adapted for gas exchange?
they have a large surface area and a good blood supply
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21
What are the three types of blood vessel called?
arteries, veins, capillaries.
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22
Is blood a cell, tissue, or organ?
Tissue
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23

What does blood contain?

plasma with red blood cells, white blood cells and platelets in it

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24

What do red blood cells do?

they carry oxygen

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25

What do white blood cells do?

they help the body fight infection

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26
What are platelets?
They are small fragments of cells (no nucleus) which help blood to clot at wounds
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27

Name six types of plant tissue

epidermal tissues, palisade mesophyll, spongy mesophyll, xylem, phloem , meristem tissue

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28
Where is plant epidermal tissue found?
It covers the whole plant.
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29
Where is meristem tissue found?
at the growing tips of shoots and roots
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30
What is transpiration?
the evaporation of water from the surface of plants (usually the leaves)
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31
What is translocation in plants?
the movement of sugar around the plant
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32

How would you test food to see if it contains fats?

Using the Ethanol test. A + result will be cloudy.

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33
What do stomata on leaves do?
control the water loss from the plant
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34

What do root hair cells do?

they absorb water by osmosis, and mineral ions by active transport

<p>they absorb water by osmosis, and mineral ions by active transport</p>
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35
What is xylem tissue?
hollow tubes strengthened by lignin adapted for the transport of water
hollow tubes strengthened by lignin adapted for the transport of water
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36
What does xylem tissue do?
transports water and mineral ions from the roots to the stems and leaves
transports water and mineral ions from the roots to the stems and leaves
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37
What is phloem tissue?
tubes of elongated cells with pores in the ends
tubes of elongated cells with pores in the ends
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38

What does phloem tissue do?

transports dissolved sugars from the leaves to the rest of the plant for immediate use or storage

<p>transports dissolved sugars from the leaves to the rest of the plant for immediate use or storage</p>
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39

What are the blood vessels that carry blood to the heart called?

The vena cava and the pulmonary vein

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