Homeostasis Lecture Topic 1 - Midterm

Question 1

What is Homeostasis?

Answer 1

A state of balance among all the body systems needed for the body to survive and function correctly.

Question 2

provide an example of homeostasis

Answer 2

Body temperature regulation
If its cold out we need to stay warm
Shivering to stay warm
Body responds to cold and adjust accordingly

Question 3

Factors Homeostatically Regulated

Answer 3

Concentration of nutrient molecules
Concentration of O2 and CO2
Concentration of waste products
pH (power of hydrogen, e.g., acidity)
Concentration of water, salt, and other electrolytes
Blood plasma volume and pressure
Temperature

Question 4

How Do We Coordinate Responses of Different Organs?

Answer 4

Need a feedback system

Question 5

what does a feedback system consist of

Answer 5

Sensory system
Relay station
Response system

Question 6

Homeostasis is Organ-specific. True or false provide an example

Answer 6

yes
when you change the level of O2, its not gonna be a uniform response from all systems, its gonna be specific to the lungs, cardiovascular system

Question 7

Homeostasis is Environment/stimulus specific. True or false.

Answer 7

true
Depending on the strength of the stimulus the body responds accordingly

Question 8

How Do We Maintain Homeostasis?

Answer 8

Most of the systems, molecules, and substances exist at set points (i.e. body temperature, water levels)
We strive to live at these set points
Things that alter our set points are compensated for by our physiological systems
FEEDBACK

Question 9

provide an example of homeostatic set point

Answer 9

Human body homeostasis body temp is typically: 37 degrees

Question 10

what are the two types of Feedback Regulation

Answer 10

positive and negative Feedback

Question 11

what is negative feedback? provide an example

Answer 11

Response counteracts the initial stimulus
Ex: When you heat up (hot weather, exercise) you sweat to cool off

Question 12

what is the most common form of feedback

Answer 12

negative

Question 13

DRAW OUT AN EXAMPLE OF NEGATIVE FEEDBACK

Question 14

what is positive feedback. provide an example

Answer 14

Response adds to the initial stimulus
(Less common form of feedback)
Example: Uterine contractions become increasingly stronger until the birth of the baby

Question 15

what is the risk associated with positive feedback

Answer 15

Abnormal changes move the body farther away from homeostatic balance and, potentially, toward death.

Question 16

what is Feedforward Regulation. provide an example

Answer 16

Prime the system for challenges to come
Anticipatory situations
Ex: Smell food
stomach churns
Salivate
Responses associated with food intake
No food intake to give the physical stimuli to initiate digestive responses

Question 17

Generalizations in Homeostatic Control: Set points are maintained over a small range. true or false

Answer 17

true

Question 18

Generalizations in Homeostatic Control: Set points can be reset (up or down). true or false

Answer 18

true

Question 19

Generalizations in Homeostatic Control: Heirarchy of control: some things are more important than others. true or false

Answer 19

true

Question 20

Generalizations in Homeostatic Control: Need some form of sensory mechanism to detect deviations from set points. true or false

Answer 20

true

Question 21

Generalizations in Homeostatic Control:Stability achieved by balancing inputs and outputs. true or false

Answer 21

true