Coordination

Question 1

Why is coordination necessary?

Answer 1

organisms need to coordinate the function of different cells and systems to operate effectively

few body systems can work in isolation

most stystem are interdependant, e.g. for a muscle to contract, muscle cells must constantyl respire, thus require a constant oxygen supply.

in plants - light-senstive chemicals enable plants to coordinate the development of flowerbuds with the lengthening days that signal the approach of spring and summer

Question 2

What is homeostasis?

Answer 2

function of organs are coordinated in order to maintain a relatively constant internal environment

e.g. dugestuve organs such as the exocrine pancreasm duodenum and ileum along witht the endeocrine pancreas and the lvier work together to maintain a constant blood glucoise concentration

Question 3

How does cell signalling occur?

Answer 3

one cell releasing a chemical which has an effect on another cell, this cell is called the target cell

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this can transfer signals locally (e.g. neurones at synapses), or across large distanes (e.g. pituitary gland secrete ADH, which operates in the kidney)

Question 4

How are plants coordinated?

Answer 4

through use of hormones

e.g. stems grow towards a light source to maximise their rate of photosynthesis