homeostasis and response (T5)

Question 1

define homeostasis

Answer 1

the regulation of the internal conditions of a cell or organism to maintain the optimum conditions for function, in response to internal and external changes

Question 2

why do we need to control internal conditions

Answer 2

enzymes:
- enzymes only work at their best in specific conditions (opt. temp and pH)
- enzymes control all the functions of a cell
- the functioning of a cell is vital for the tissues, organisms and organs to work

Question 3

what internal conditions need to be controlled?

Answer 3

• body temp
• water content
• blood glucose conc

Question 4

how are the internal conditions controlled

Answer 4

detecting changes and responding to them involves automatic control systems including the nervous system and the hormonal system (endocrine system)

Question 5

what detects changes (stimuli)

Answer 5

receptor cells

Question 6

what decides what needs to be done (processes information)

Answer 6

coordination centre - brain/spinal cord

Question 7

what makes the response happen

Answer 7

effectors - muscles/organs

Question 8

where are receptor cells found

Answer 8

in sense organ

Question 9

what are the senses and sense organs

Answer 9

• touch - skin
• smell - nose
• sight - eyes
• taste - tongue
• sound - ears

Question 10

what are the two communication systems + diff in response?

Answer 10

• nervous system - produces fast, short-lasting response
• hormonal system - produces slow long-lasting response