Homeostasis

Question 1

What is homoeostasis?

Answer 1

The functions of your body which try to maintain a constant internal environment

Question 2

What must be kept constant in your body?

Answer 2

Ion content
Water content
Sugar content
Temperature

Question 3

How is ion content regulated?

Answer 3

By the kidneys

Question 4

How are ions taken into the body?

Answer 4

Food

Question 5

What happens when the ions enter the body?

Answer 5

They are absorbed by the blood

Question 6

What happens if the food contains too much of any kind of ion?

Answer 6

The excess ions need to be removed

Question 7

How can ions be lost?

Answer 7

Sweat

Question 8

What organ will remove the excess ions from the blood?

Answer 8

The kidneys by urine

Question 9

How is water lost from the body?

Answer 9

Skin - Sweat
Lungs - Breath
Kidneys - Urine

Question 10

How is water taken into the body?

Answer 10

Food and drink

Question 11

What happens on a cold day involving sweat?

Answer 11

Do not sweat as much

Produce more urine

Question 12

What happens on a hot day involving sweat?

Answer 12

Sweat more
Produce less urine
Urine will be more concentrated

Question 13

What temperature do enzymes work best in your body?

Answer 13

37 degrees Celsius

Question 14

How is your body temperature controlled by the brain?

Answer 14

A part of the brain acts as your own personal thermostat
It is sensitive to the blood temperature in the brain
It receives messages from the skin to provide information about skin temperature

Question 15

What happens if you eat food containing carbohydrates?

Answer 15

Glucose goes into the blood from the gut

Question 16

How is glucose removed from the blood?

Answer 16

The normal metabolism of cells removes it

Question 17

What happens if you do a lot of exercise?

Answer 17

More glucose is removed from the blood

Question 18

What does insulin do?

Answer 18

Helps to maintain the right level of glucose in your blood

This is so your cells get a constant supply of energy

Question 19

What is HDL?

Answer 19

It takes cholesterol back to the liver to go get broken down

Question 20

What is LDL?

Answer 20

Tries to take cholesterol back to the liver however drops it as it could not make it

Question 21

Temperature?

Answer 21

When hypothalamus senses that the body temperature is too high it causes the body to sweat
It then causes vasodilation where the veins widen
When the hypothalamus senses that the body temperature is too low it causes the hairs to stand up and the body shivers
This is vasoconstriction

Question 22

Blood sugar?

Answer 22

Blood goes up by eating
Pancreas detects it
Releases insulin
Blood sugar goes to liver and muscle 
Stored as glycogen
Blood sugar goes down
Pancreas detects it
Creating glucagon
Breaks glycogen back into glucose

Question 23

Water and ions?

Answer 23

Hypothalamus detects low water
Pituitary gland makes ADH 
More ADH more water absorbed
Level goes up 
If it goes up too much hypothalamus detects it
Less ADH made
Less water reabsorbed
More water lost in urine