Mod1-Obj 5: Homeostasis

Question 1

Homeostasis

Answer 1

Dynamic state of equilibrium, in which internal conditions vary, but always within relatively narrow limits

Question 2

Maintaining homeostasis

Answer 2

• Organ systems carry out processes that maintain a dynamic stable state for the ECF, making appropriate corrections
• Stimulus causing a corrective response

Question 3

Extracellular fluid is made up of…

Answer 3

1. Interstitial fluid-in tissues between cells
2. Plasma-within blood vessels
3. Other fluids (named for their location)

Question 4

The internal environment consists of…

Answer 4

Extracellular fluid that bathes body cells

• The fluid inside cells is called intracellular fluid
• For cells to function optimally the conditions in the internal environment need to be carefully controlled

Question 5

Various factors in the ECF are kept within narrow limits, that are essential for life:

Answer 5

1. Gases and nutrients
2. Water volume and pressure
3. Electrolyte concentration
4. Acid-base balance
5. Temperature
6. Waster products

Question 6

Homeostatic control: Receptor

Answer 6

Sensor that monitors the environment and responds to changes, called stimuli, by sending information (input) to the second component, the control center

Question 7

Input flows from the receptor to the control centre along the…

Answer 7

Afferent pathway

Question 8

Homeostatic control: Control centre

Answer 8

Determines the set point, which is the level or range at which a variable is to be maintained. It also analyses the input it receives and determines the appropriate response

Question 9

Output flows from the control centre to the effector via the…

Answer 9

Efferent pathway

Question 10

Homeostatic control: Effector

Answer 10

Provides the means for the control centre’s response to the stimulus. Results of the response then feed back to influence the effect of the stimulus, either reducing it (negative) or enhancing it (positive)