AQA Biology Paper 2 - Homeostasis

What is homeostasis?

• A When things in the body are kept the same.
• B When the body maintains optimal conditions for enzyme action and all cell functions.
• C When the body responds in a similar way to a stimuli
• D When the body maintains a constant internal environment so that it can stay healthy.

Conditions that need to be controlled by the body are:

• A Blood glucose, body temperature and water levels.
• B Energy intake and energy output
• C Blood and water
• D Heart rate and temperature

What is the function of a receptor cell?

• A To detect changes in the environment
• B To tell the body how to respond to changes in the environment
• C To bring about a response to changes in the environment
• DTo receive and coordinate information.

Which of the following is an example of an effector?

• A The brain
• B The eye
• C The adrenal gland
• D The wrist

Which of the following best describes how the CNS coordinates a response to a stimulus?

• A.   Stimulusà receptor à co ordinator à effector à response
• B.   Receptor à stimuli à effector à response.
• C.   Co ordinator à stimulià effector à response
• D.   Stimulus à receptor àeffector à coordinator à response.

Which organs make up the Central Nervous System?

• A Sensory and motor neurones
• B Spinal cord and thigh muscle
• C The eye and brain
• D The brain and spinal cord

Why are reflex actions faster than a normal nervous response?

• A.   Because the nerve impulses move faster in a reflex action
• B.   Because nerve impulses do not involve the conscious part of the brain
• C.   Because the response travels through fewer neurones.
• D.   It travels across the synapses quicker

How does a nerve impulse move across the synapse?

• A.   It jumps across the gap
• B.   The neurotransmitter diffuses across the gap
• C.   The impulse spreads out.
• D.   The impulse starts again.

How is a hormonal response different to a nervous response?

• A. With hormones the effect is faster.
• B. With hormones the effect is slower
• C. A nervous response lasts longer.
• D. A nervous response takes longer to take effect.

What is the role of glands?

• A To secrete chemicals called hormones
• B To coordinate a response
• C To produce an effect to a stimuli
• D To speed up a response