Homeostasis

Question 1

Homeostasis

Answer 1

The existence and maintenance of a relatively constant environment within the body.

Question 2

variables

Answer 2

Changes in internal body conditions that are not constant.

Question 3

normal range

Answer 3

The narrow range in which cells to function normally.

Question 4

set point

Answer 4

homeostatic mechanisms maintain body conditions near this ideal normal value.

Question 5

feedback loops and the four components

Answer 5

This allows a process to be regulated by the outcome.
1) receptor
2) control center
3) effector
4) stimulus

Question 6

negative feedback (with example)

Answer 6

This mechanism is most commonly involved in the maintenance of homeostasis.
Ex. sweating for temperature regulation.

Question 7

positive feedback (with examples)

Answer 7

This mechanism occurs when a response to the original stimulus results in the deviation from the set point becoming even greater.
Ex. Giving birth or blushing because of embarassment.

Question 8

Receptor

Answer 8

This component of a feedback loop monitors the value of a variable by detecting stimuli.

Question 9

Control Center

Answer 9

This component of a feedback loop determines the set point for the variable and receives input from the receptor about the variable.

Question 10

Effector

Answer 10

This component of feedback loops generates the response that adjusts the value of the changed variable.

Question 11

Stimulus

Answer 11

This component of a feedback loop is a changed variable because it initiates a homeostatic mechanism.

Question 12

How a response stops a feedback loop.

Answer 12

When a variable returns to a set point.

Question 13

The two basic principles about homeostatic mechanisms:

Answer 13

1) Many disease states result from the body’s failure to maintain homeostasis.
2) some positive feedback mechanisms can be detrimental.