Homeostasis

Question 1

What are the needs of an organism?

Answer 1

i) Nutrients
ii) Oxygen
iii) Water
iv) Appropriate Temperatures
v) Appropriate atmospheric pressure

(in the appropriate amount)

Question 2

What are the characteristics of an organism?

Answer 2

i) Maintenance of boundaries
ii) Movement
iii) Responsiveness
iv) Digestion, Metabolism, and Excretion
v) Adaptation
vi) Reproduction
vii) Growth and Development
viii) Regulation

Question 3

Homestasis

Answer 3

Regulations of the body’s internal condtions

Question 4

What type of equilibrium is needed for homeostasis?

Answer 4

Dynamic Equilibrium

Question 5

What organs play a role in regulation?

Answer 5

Nearly all of them

Question 6

Internal conditions must stay _______ , as outside conditions change.

Answer 6

Stable

Question 7

Variable

Answer 7

Subject to change

Question 8

What three components mange the variables of the body?

Answer 8

i) Receptors
ii) Control Center
iii) Effectors

Question 9

Receptors

Answer 9

Sensors that monitor the environment for stimulus

Question 10

Control Center

Answer 10

Determines the set point

Question 11

Effectors

Answer 11

Provides feedback to the stimulus

Question 12

Afferent

Answer 12

Towards control center

Receptor –> Control Center

Question 13

Efferent

Answer 13

Away from control center

Control Center –> Effector

Question 14

What are the five steps of the homeostatic control pathway?

Answer 14

i) Stimulus
ii) Receptor
iii) Input
iv) Output
v) Response

Question 15

What is the goal of homeostasis?

Answer 15

To restore balance from imbalance

Question 16

How is homeostasis regulated?

Answer 16

Self-adjusting mechanism called a feedback loop

Question 17

Negative Feedback Loop

Answer 17

Stimulus starts the process and a series of effects causes the process to slow down or turn off.

(A change is detected by a receptor and an effector is activated to induce an opposite effect – this promotes equilibrium)

Question 18

Give an example of a negative feedback loop

Answer 18

(e.g. Blood glucose regulation, Thermoregulation,

Question 19

Positive Feedback Loop

Answer 19

Accelerates the original process, ensuring it continues or speeding it up (cascade).

Question 20

Give an example of a positive feedback loop

Answer 20

(e.g. milk release from mammary glands, blood clot formation)