Chapter 13 neuronal communication 13.1

Question 1

What are the changes that can occur in the internal environment?

Answer 1

Blood glucose concentration
Internal temperature
Water potential
Cell pH

Question 2

What are the changes that can occur in the external environment?

Answer 2

Humidity
External temperature
Light intensity
New or sudden sound

Question 3

What does homeostasis mean?

Answer 3

To maintain a relatively constant internal environment

Question 4

What is cell signalling?

Answer 4

When one cell releases a chemical that has an effect on another cell ( the target cell).

Question 5

When transferring signals a long distance which is the best option neural or hormonal?

Answer 5

Hormonal e.g. cells of the pituitary gland secrete antidiuretic hormone (ADH) which acts on cells in the kidneys to maintain water balance in the body.

Question 6

When transferring signals a short distance/ locally which is the best option neural or hormonal?

Answer 6

Neural, between neurones and synapses, the signal used is a neurotransmitter.