Co-ordination and response: Practice Questions

Which part of the eye acts as the receptor by containing light-sensitive cells called rods and cones?

When the eye focuses on a distant object, which of the following changes occur to allow the light to be focused correctly on the retina?

A person is reading a book in a dimly lit room. They then walk outside into bright sunlight and look at a distant mountain. Which of the following correctly describes the physiological changes that occur in the person's eyes?

Which of the following is a characteristic of hormonal communication when compared to nervous communication?

During temperature regulation in the skin, what occurs to reduce heat loss when the body temperature falls below normal?

Identify the organ that produces insulin and state its primary effect on blood glucose levels.

Describe how neurotransmitters facilitate the transmission of a signal across the gap between two neurones.

Explain the mechanism by which auxin causes a plant shoot to grow towards a light source, and state why this is described as positive phototropism.

(a) Define the term homeostasis.
(b) Organisms must be able to detect and respond to changes in their environment. State the three essential components required for a co-ordinated response.

(a) State the name given to an automatic and rapid response to a stimulus.
(b) Describe the pathway of a nerve impulse during a withdrawal reflex, such as when a person touches a hot object. In your answer, name the specific types of neurones involved and the junctions where chemicals are released to transmit the signal.