Which part of natural and artificial control systems detects changes?
- Receptors
- Effectors
- Processing centres
Which part of natural and artificial control systems coordinate a response to a change?
- Receptors
- Effectors
- Processing centres
Which part of natural and artificial control systems produce a response to a change?
- Receptors
- Effectors
- Processing centres
What is negative feedback?
- A change from normal causes a bigger change from normal.
- A change from normal causes the change to be reversed.
- A change from normal causes the body to move away from the problem.
What does antagonistic mean?
- Working with something.
- Working against something.
- Working to stop something.
Diffusion is the movement of substances...
- From a low concentration to a high concentration.
- From a high concentration to a low concentration.
- Across a membrane.
- When the concentration is the same in both places.
Active transport is the movement of substances...
- From a low concentration to a high concentration.
- From a high concentration to a low concentration.
- Across a membrane without needing energy.
- When the concentration is the same in both places.
For which substance is osmosis a particular example of diffusion?
- Water
- Oxygen
- Carbon dioxide
- Urea
Which of the following can be a problem if too much water enters cells?
Enzymes are catalysts in cells. What are they made of?
The part of an enzyme where reactants bind to it is called its...
- Active site
- Lock and key
- Active key
- Key site
Which factor is likely to speed up an enzyme reaction?
- low pH
- High temperature
- A small increase in temperature
- A small decrease in temperature
Which of these are ways that the body gains water?
Which of these processes are in the best order describing how the kidneys regulate water?
- Filtration, reabsorption, excretion
- Reabsorption, filtration, excretion
- Excretion, filtration, reabsorption
- Filtration, excretion, reabsorption
What would be the effect on urine of playing sport on a hot day.
- volume would be low and concentration would be high
- volume would be low and concentration would be low
- volume would be high and concentration would be low
- volume would be high and concentration would be high
Which part of the body detects and coordinates water concentration?
- Brain
- Kidneys
- Liver
- Bladder
Which hormone regulates water concentration by altering the volume of urine the body produces?
- ADH
- Insulin
- Oestrogen
- Adrenalin
Which is usually true?
- Core temperature is the same as the temperature of the extremities.
- Core temperature is higher than the temperature of the extremities.
- Core temperature is lower than the temperature of the extremities.
Whcih of these responses help the body cool?
Hypothermia is when...