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Biology: 1 > Homeostasis > Flashcards

Flashcards in Homeostasis Deck (31):
1

Define 'homeostasis'

All the functions in your body which try to maintain a 'constant internal environment'

2

Why must certain things be kept at the right level within your body?

To keep all your cells working properly

3

Name 4 bodily levels that need to be controlled

1. Ion content

2. Sugar content

3. Water content

4. Temperature

4

Which organs regulate ion content?

The kidneys

5

Give an example of an ion

Sodium, Na+

6

Ions are taken into the body in ____, then ____ into the ____ .

Ions are taken into the body in food, then absorbed into the blood .

7

How do ions get into the body?

They are taken in in food

8

What happens if food contains too much of an ion?

The excess ions need to be removed

9

Give an example of food containing too much of an ion

A salty meal containing too much Na+

10

Name 2 ways that excess ions are removed

1. Some are lost in sweat

2. The kideneys will remove excess from the blood - this is then gotten rid of in urine

11

Eating what kind of food causes glucose to be put into the blood?

Carbohydrates

12

Where does the glucose put into the blood come from?

The gut

13

If you aren't exercising, describe how glucose is removed from the blood

The normal metabolism of cells removes glucose from the blood

14

What happens to how much glucose is removed from the blood when you do a lot of vigorous exercise?

Much more glucose is removed from the blood

15

Which hormone helps to maintain the right levels of glucose in your blood?

Insulin

16

Why does insulin need to help maintain the right level of glucose in your blood? 

So your cells get a constant supply of energy

17

There's a need for the body to ____ ____ the water coming in against the water coming out

There's a need for the body to constantly balance the water coming in against the water coming out

18

Name the 2 ways water is taken into the body

1. As food

2. As drink

19

Name the 3 main ways and the 4th ways that water is lost from the body

1. Through the skin as sweat

2. Via the lungs as breath

3. Via the kidneys as urine

(4. Some is also lost in faeces)

20

Name 2 things that the balance between sweat and urine can depend upon

1. How much exercise you're doing

2. The weather

21

Describe the balance of sweat and urine (+ urine detail) produced by the body on a cold day when you aren't exercising much

You don't sweat much

SO

You'll produce more urine which will be pale

22

Why does yor urine go pale when you don't sweat much?

The water carried in the urine is more diluted

23

Describe the balance of sweat and urine (+ urine detail) produced by the body on a hot day when you are exercising

Where else will you water?

Why

You sweat a lot

SO

You'll produce less urine which will be a deeper colour

You will also lose more water through your breath 

Because when you exercise you breathe faster

24

Why will your urine ne a deeper colour on a hot day when you're exercising?

Because you will lose more water in your sweat and your breath so your urine will be more concentrated

25

Which organ controls body temperature?

The brain

26

What temperature does the body try to maintain?

37oC

27

Why does your body try to maintain a constant temperature of 37oC?

Because that is the temperature that the enzymes within the human body work best at

28

Explain how your brain works in terms of keeping yor body at a constant temperature

(2)

1. A part of the brain is sensitive to the blood temperature in the brain

2. It receives messages from the skin that provide information about skin temperature

29

Which 2 substances do sports drinks often include?

1. Electrolytes

2. Carbohydrates

30

Why do sports drinks often contain electrolytes?

To replace the salts lost in sweat

31

Why do sports drinks often contain carbohydrates?

To give you an energy boost (more glucose in blood to be used in respiration be your cells)