Biology progress test 1

Define Continuous Variation

A change that happens gradually - for example foot length. It can be caused by environmental factors or genes

1 of 26

Define Discontinuous Variation

Differences in one feature That only have a few options. You either have the gene or you don't - for example blood type

2 of 26

Define Homeostasis

It is the maintenance of a constant internal enviroment

3 of 26

Name 3 things our body has to regulate

Body temp, Blood sugar levels and Water levels

4 of 26

Explain what happens when we get too hot

- Sweat gland release sweat to be evapourated in order to transport heat energy away from your skin - Vasodilation - Hair on skin : hair muscles relax and hairs lie flat so heat can escape

5 of 26

Explain when we get too cold

- Erect hair traps air (insulates) - vasoconstriction -body shivers generating heat energy

6 of 26

define vasoconstriction and vasodilation

vasodilation -blood vessels expand allowing more blood to flowto the skin surface to be cooled by the environment around us vasoconstriction - blood vessels contract so less blood flows to the surface and less heat is lost

7 of 26

Where is a thermo receptor situated and what does it do

They are in the skin and the detect changes in the external temp and pass this information on to the hypothalamus

8 of 26

what is the Hypothalamus

It is the thermoregulatory and the processing centre of the Brain

9 of 26

What happens to enzymes if the temperature gets over 37 degrees

They denaturalise and do not work properly

10 of 26

What happens to enzymes if the temperature falls under 37 degrees

They die

11 of 26

What do you die from if you are too hot

HypErthermia

12 of 26

What do you die from if you are too cold

HypOthermia

13 of 26

What ways do we lose water

breathing, sweating, in urine and in faeces

14 of 26

What are your water levels controlled and monitored by

The hypothalamus in the brain

15 of 26

What does the hormone ADH stand for?

antidiuretic hormone

16 of 26

what does ADH controll

The concentration of urine (the more water that needs to go (i.e too much) the less ADH is needed

17 of 26

Explain what happens when you have too little water

1) Detected by hypothalamus (2 more ADH released from the pituitary gland in the brain 3) kidneys absorb less water so less is lost in urine 4) blood water levels are back to normal - URINE IS MORE CONCENTRATED

18 of 26

Explain when you have too much water

1) Detected by hypothalamus (2 less ADH released from the pituitary gland in the brain 3) kidneys absorb more water so more is lost in urine 4) blood water levels are back to normal - URINE IS MORE DILUTE

19 of 26

What is glucose

sugar used in respiration and in all of your cells to make energy

20 of 26

What is Glycogen

a storage substance made of glucose and stored in the liver

21 of 26

What is Insulin

a hormone that lets glucose into cells and changes glucose into glycogen in the liver. Insulin is made in the pancreas

22 of 26

What is glucagon

a hormone (a type of insulin) that turns Glycogen BACK INTO glucose. it is produced by the pancreas

23 of 26

What happens when you have too little glucose in your blood?

causes the liver to release more glucose into blood as glucagon turns glycogen (storage substance of glucose in the liver) back into glucose. Now you have a normal blood glucose levelThe Pancreas releases glucagon from its alpha cells. This

24 of 26

What happens when you have too much glucose in your blood

The Pancreas releases insulin from its beta cells and the insulin lets the fat cells take in glucose from the blood. Blood glucose levels are returned to normal

25 of 26

what does the pancreas control

Blood sugar levels

26 of 26

Get Revising

Biology progress test 1

Other cards in this set

Card 2

Front

Back

Card 3

Front

Back

Card 4

Front

Back

Card 5

Front

Back

Comments

Similar Biology resources: