Communication

Question 1

List conditions required for enzymes to function properly?

Answer 1

Suitable temperature
Suitable ph
Aqueous environment that keeps substrates and products in solution

Question 2

Define Stimulus

Answer 2

A change in the external or internal environment of an organism

Question 3

Define response

Answer 3

The way in which the organism changes its behaviour or physiology in reaction to a stimulus

Question 4

What will a good communication system Have/ do?

Answer 4

Cover the whole body
Enable cells to communicate with each other
Enable specific communication
Enable rapid communication
Enable both short term and long term responses

Question 5

Three ways cells communicate with each other

Answer 5

Inside cells between components
Outside the cell between cells
Different molecules send different signals

Question 6

What are the 2 major systems of communication?

Answer 6

Neuronal system: interconnected network of neurones (nerve cells) — rapid response

Hormonal system: Hormones released into blood from an endocrine gland. Recognised by target cells.— longer term responses

Question 7

Describe how hormones are used as messengers

Answer 7

Hormones are chemical messengers transported in the blood
Cell communication is often mediated by a hormone
Target cells any cell with a receptor for a hormone
Hormone and receptor on target cells bind due to their complementary shapes
Binding causes the target cell to respond in a certain way