Homeostasis and negative feedback

Question 1

what is the fluid medium called the cells are bathed in?

Answer 1

-tissue fluid

Question 2

what does homeostasis mean?

Answer 2

-the maintenance of constant or steady state conditions within the body irrespective of the external conditions

Question 3

what are the three basic features of homeostatic responses?

Answer 3

-control system with receptors
-a corrective mechanism
-negative feedback

Question 4

what does a control system with sensors do?

Answer 4

-this provides information allowing the monitoring of the factor being controlled

Question 5

what is another name for sensors?

Answer 5

-receptors

Question 6

where can receptors be in body?

Answer 6

-in the brain or localized throughout the body

Question 7

where is the control center in the body?

Answer 7

-the brain

Question 8

why is a corrective mechanism brought about? what does it do?

Answer 8

-if the receptors show a departure form the normal levels/ set point then a corrective mechanism will occur
-a corrective mechanism brings about the changes required to return the factor back to its set point

Question 9

what is an example of a corrective mechanism in mammals when they over heat?

Answer 9

-the mechanism measures can include sweating and the vasodilation of capillaries in the skin

Question 10

what is negative feedback?

Answer 10

-it occurs as the return of the factor being controlled to its set point causes the corrective measures to be turned off to prevent over correction

Question 11

what is a n example of negative feedback when mammals overheat?

Answer 11

-the stimulation of sweat glands and the degree of vasodilation is reduced by negative feedback as the temperature returns back to its set point

Question 12

how is communication between the sensors and the monitor (corrective mechanism and negative feedback) brought about?

Answer 12

-through nervous(muscle) or hormonal (glands) control

Question 13

what are the 2 reasons that homeostatic conditions are necessary in controlling mammalian bodies?

Answer 13

-provide optimum conditions for enzyme reactions
-avoid osmotic problems in cells and body fluids

Question 14

wat kind of homeostatic systems do insect have and why?

Answer 14

-they have simpler systems that are less able to keep the internal environments constant
-insects body temp usually varies with the external environment