Feb. 13 - Stress and Stress Tolerance

Question 1

Stressors

Answer 1

things that can cause a state of stress ex. heat, low H2O, low O2

Question 2

Stress

Answer 2

a normal deviation from homeostasis

Question 3

Stress response

Answer 3

cell/ organisms response to return to homeostasis

Question 4

Stressors can occur

Answer 4

simultaneously or sequentially

Question 5

Security of stress depends on

Answer 5

Intensity, duration, frequency, # of stressors

Question 6

Stress tolerance varies…

Answer 6

in approach, among species, within individuals

Question 7

Stress Tolerance Approach

Answer 7

-prevent the damage, recover to homeostasis
-repair damage, recover to homeostasis
-alter level of homeostasis
-minimize/ prevent deviations from homeostasis

Question 8

stress tolerance variation within individuals

Answer 8

-acclimatization
-acclimation

Question 9

acclimatization

Answer 9

^ in stress tolerance in response to natural environmental conditions

Question 10

acclimation

Answer 10

^ in stress tolerance in response to lab conditions

Question 11

Strategies vs mechanisms of stress tolerance

Answer 11

strategies = approach to tolerating stress
mechanisms = details of the strategy

Question 12

is air or soil more stressful

Answer 12

air because there are larger fluctuations in temperature

Question 13

hypoxia

Answer 13

oxygen deficience

Question 14

Strategies of stress tolerance for subzero temp. stress

Answer 14

• freeze tolerance
• freeze avoidance
• cryoprotectant dehydration

Question 15

mechanisms of freeze avoidance

Answer 15

• antifreeze proteins suppress ice formation
• cryoprotectant molecules protect cell components