L1:Body fluid compartments

Question 1

What is homeostasis?

Answer 1

Homeostasis is the control of a vital parameter, and is used to describe the relative consistency of the internal environment

Question 2

Give two examples of internal stimuli

Answer 2

• change in blood glucose levels

- change in pH level

Question 3

Give three examples of external stimuli

Answer 3

• Exercise
• Physical insults (heat, lack of oxygen)
• Psychological stresses (work stress, death of loved one)

Question 4

What percentage of body weight is made up of water?

Men,Women

Answer 4

60%, 50%

Question 5

What percentage of total body water is made up of intracellular fluid?

Answer 5

60%

Question 6

Na, Ca and Cl ions have a much ___ conc. In the extracellular fluid than the intracellular fluid

Answer 6

Higher

Question 7

K ions have a much ___ conc. in the extracellular fluid than in the intracellular fluid

Answer 7

Lower

Question 8

What is asymmetric distribution of ions important for?

5 bullet points

Answer 8

• setting the membrane potential
• generating electrical activity in nerve and muscle
• initiation of muscle contraction
• Providing energy for the uptake of nutrients and expulsion of waste products
• generating intracellular signalling cascades

Question 9

What effect does a hypertonic solution have on RBCs?

Answer 9

Causes them to shrink

Question 10

What effect does a hypotonic solution have on RBCs?

Answer 10

Causes swelling, if this becomes too great the cell will lyse