Coordination 13.1

Question 1

Internal Environment

Answer 1

Blood glucose concentration, temperature, cell pH and water potential

Question 2

External environment

Answer 2

Temperature, humidity, light intensity, sounds

Question 3

How does the body respond to changes in the environment?

Answer 3

It will produce an electrical signal (neurones) or a chemical signal (hormonal)

Question 4

3 reasons why we need coordination

Answer 4

• Red blood cells deliver oxygen but cannot replicate so rely on haematopoietic stem cells to constantly produce them.
• Muscle cells need oxygen as they constantly respire but they cannot transport oxygen so require red blood cells to give it to them.
• Plant flowering must coordinate with the seasons so light sensitive chemicals enable plants to coordinate the development of flower buds depending on the amount of light its getting.

Question 5

Homeostasis

Answer 5

This is a constant environment that is maintained by the body at resting state and this has to be maintained by all the organs by coordinating them.

Question 6

Cell Signalling

Answer 6

This is used so that systems can coordinate activities of the whole cell. Cell signalling is when a cell releases a chemical which will take effect on another cell called a target cell. The chemical can travel short ranges like for neurones, their messages are neurotransmitters. For glands, their chemicals are hormones and can travel longer distances.

Question 7

Plant Coordination

Answer 7

Plants don’t have a nervous system, so they respond to changes by plant hormones such as a plant growing towards the light.