B12 Homeostasis in Action Flashcards
What are the four ways in which water is lost from the body?
- In urine
- Swet
- Breathed out
- In faeces
Why would someone lose more water through the skin on a warm day than a cold day?
More swet produced on a warm day for cooling.
On a hot day we swet and lose water more rapidly.
How do we respond to maintain the water balance in the body?
- The volume of water in the urine decreases.
2. We drink and eat more to take in more water.
Sweat contains water and…
ions.
On a hot sunny day, man A sat in the shade drinking beer, while man B went jogging outside.
How would the (a) volume and (b) concentration of urine produced by man B compare with man A?
a) The volume of urine produced by man B would be lower.
but. ..
b) The concentration of urine produced by man B would be higher.
Water is lost in sweat via which organ?
The skin
Water is lost in urine via which organ?
The kidneys
Water is lost in the breath via which organ?
The lungs
In a class, the students’ body temperatures are recorded as follows:
- 8°C - 5 students
- 9°C - 3 students
- 0°C - 6 students
- 1°C - 7 students
- 2°C - 3 students
Explain why the mean temperature is 37°C.
Multiply temperature by the number of students at that temperature and add them up. Then divide by the total number of students.
(36. 8×5) + (36.9×3) +
(37. 0×6) + (37.1×7) + (37.2×3) = 888
888 / 24 = 37
[Not simply add 36.8 + 36.9 + etc then divide 5]
Body temperature must be kept within a narrow range. Why?
So enzymes can work well (at their optimum temperature).
Which organ produces urine?
Kidneys
Which organ stores urine?
Bladder
Which organ produces urea?
Liver
Which organ gets rid of carbon dioxide?
Lungs
Which organ helps to control body temperature?
Skin
