13.1 Coordination

Question 1

In what two ways do animals react to changes in their internal and external environment

Answer 1

through electrical responses (via neurones) and through chemical responses (via hormones)

Question 2

Define homeostasis

Answer 2

the regulation of the internal environment of an organism or cell to maintain a stable and optimal internal state, despite external changes

Question 3

What is cell signalling and how does it occur

Answer 3

the way in which cells communicate with each other one cell releases a chemical which has an effect on another cell, known as a target cell

Question 4

What two things can cells do through the use of cell signalling

Answer 4

transfer signals locally between neurones at synapses (neurotransmitter)
- transfer signals across large distances using hormones

Question 5

what do plants do to respond to internal and external changes without a nervous system?

Answer 5

They adapt through the use of plant hormones

Question 6

what do nervous and hormonal systems rely on as they coordinate the activities of a whole organism?

Answer 6

Cell signalling