Homeostasis and Fluids

Question 1

_____ is the sum of all chemical reactions going on in cells of an organism

Answer 1

metabolism

Question 2

____ is the maintenance of a stable internal environment

Answer 2

homeostasis

Question 3

_____ feedback and ____ feedback are the 2 homeostatic mechanisms - which is most common?

Answer 3

positive and negative

Negative

Question 4

In negative feedback, The ____ monitor deviations from the ‘set point’ and the ____ bring about the change to bring the variable back to the set point.

Answer 4

receptors

effectors

Question 5

the 2 fluid compartments within the body are _____ and _______

Answer 5

intracellular

extracellular

Question 6

Intracellular fluid compartment is all water and electrolytes ______ the cells and makes up 63% of the total body water

Answer 6

within

Question 7

Extracellular fluid compartment is all water and electrolytes ____ the cell - includes interstitial fluid, blood plasma, lymph. Also includes ________ fluid (eg cerebrospinal fluid, fluid in eyeballs etc)

Answer 7

outside

transcellular

Question 8

Water and electrolyte movement is regulated by ______ pressure and ______ pressure

Answer 8

hydrostatic

osmotic

Question 9

The thirst centre is located in the _____ and changes are detected by ______

Answer 9

hypothalamus

osmoreceptors

Question 10

The pH of body fluid is regulated by ______ buffer systems and _____ buffer systems , which includes … (2)

Answer 10

chemical (fastest buffer system - works immediately)

physiological - respiratory centre in brain stem (gets rid of CO2) and the kidneys (H ions excreted)