Homeostasis and Body Systems Quiz

What effect does focusing on near objects have on the amount of light the eye refracts?

• It decreases

• It stays the same

• It increases

• It disappears

What role do effectors play in the body?

• They pick up changes inside and outside the body

• They generate electrical impulses

• They receive messages from the CNS and bring about a response

• They store nutrients

What is a nerve composed of?

• A bundle of nerve cells or neurones

• A group of muscles

• A collection of bones

• A series of blood vessels

What links all parts of the body to the CNS?

• Nerves

• Blood vessels

• Muscles

• Bones

How does the lens change when focusing on near objects?

• It becomes thinner

• It becomes thicker

• It becomes longer

• It becomes flatter

What can a surgeon precisely control during laser eye surgery?

• The color of the eye

• The amount of tissue being removed

• The size of the eye

• The shape of the lens

What is the effect of the radial muscles relaxing in bright light?

• The pupil becomes larger

• The pupil becomes smaller

• The iris changes color

• The eye becomes more sensitive

What is the correct sequence of a reflex arc pathway?

• Stimulus → Effector → Sensory neurones → Motor neurones → Response

• Stimulus → Receptor → Sensory neurones → Relay neurones → Motor neurones → Effector → Response

• Stimulus → Motor neurones → Relay neurones → Sensory neurones → Effector → Response

• Stimulus → Receptor → Motor neurones → Sensory neurones → Relay neurones → Effector → Response

What is the role of a neurotransmitter in a synapse?

• It blocks impulses

• It carries electrical impulses across the gap

• It stores energy

• It connects neurons physically

What type of stimuli do the ears detect?

• Light

• Chemicals in food

• Sound (and position of head)

• Touch