Term
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Definition
| "Keeping a steady state inside your body." |
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Term
| What constants must your body maintain? Name 3 |
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Definition
Body temperature
Salt levels
Water levels
Nutrient levels eg glucose |
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Term
| What makes up a control system? |
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Definition
| A receptor, a processing centre, an effector. |
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Term
| Name a receptor, a processing centre and an effector in your body appropriate for a change in light. |
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Definition
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Term
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Definition
| A protein that catalyses (speeds up) chemical reactions in living things. |
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Term
| An enzyme has an A..... S... where the reaction of the M....... |
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Definition
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Term
| To speed up a reaction you can increase the temperature. Name 3 effects of the temperature rising. |
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Definition
- The molecules have more energy
- They move around faster and collide more often
- They react more easily when they collide
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Term
| What is your average core temperature? And where is it measured? |
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Definition
| 37oC and it is measured in the brain or trunk. |
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Term
| What will happen if you increase the temperature of enzyme reactions? |
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Definition
| The enzyme will become denatured. This means they will no longer work as the molecules they react with will not fit into the Active Site. The enzyme cannot return to its original shape even when it cools down. |
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Term
| 37oC is O...... temperature for enzymes as they work best. Why? |
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Definition
| Optimum. It is high enough for collisions to occur frequently and with enough energy but low enough to prevent the enzymes becoming denatured. |
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Term
| The shape of an enzymes active site is also effected by pH. Name the optimum pH for salivary amalse, pepsin and catalase. |
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Definition
Salivary amylase- 4.8
Pepsin-2.0
Catalase-7.6 |
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Term
| Write the word equation for respiration. |
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Definition
| glucose+oxygen=carbon dioxide+water+energy |
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Term
| What happens when you shiver? |
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Definition
| Your muscle cells contract quickly. They respire much faster to release energy for this movement therefore there is more energy for keeping warm. Shivering is an automatic response. |
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Term
| What happens when you sweat? |
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Definition
| Your brain stimulates sweat glands. They make sweat that passes out of the pores in your skin. When the sweat evaporates it cools you down. |
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Term
| When is your body temperature the lowest? And highest? |
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Definition
Lowest-when you are sleeping
Highest during exercise or during a meal. |
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Term
| Name 4 things that can help warm you up. |
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Definition
Shivering
Warm food or drink
Clothes and hair raising
Area of heat
VASONCONSTRICTION |
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Term
| Name 4 things that can help you cool down. |
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Definition
Sweating
Cold drinks or food
Protective clothing
A fan
VASODILATION |
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Term
| Define vasodilation and vasoconstriction. |
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Definition
Vasodilation- When the blood vessels close to the top of your skin widen to allow more heat to escape.
Vasoconstriction-The blood vessels close to the top of your skin contract to prevent heat loss. |
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Term
| What is the processing centre in the brain called? |
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Definition
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Term
| What is the difference in diffusion and osmosis? |
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Definition
Diffusion-Any substance
Osmosis-Water only |
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Term
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Definition
| The movement of a substance from an area of higher concentration to an area of lower concentration |
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Term
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Definition
| The movement of water from an area of high concentration to an area of low concentration |
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Term
| What is active transport? And how does it happen? |
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Definition
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