Sustaining Life and Homeostasis

Question 1

Necessary life functions:

Answer 1

Maintains boundaries, movement, responsiveness, digestion, metabolism, excretion, reproduction, growth

Question 2

Maintains Boundaries

Answer 2

Internal environment is separate from the external environment

Question 3

Movement

Answer 3

Includes movement of the body from one place to another as well as blood, food, urine, etc. through the body

Question 4

Responsiveness

Answer 4

Ability to sense changes in the environment and respond

Question 5

Digestion

Answer 5

Breaking down food into molecules that can be absorbed by the bloodstream

Question 6

Metabolism

Answer 6

Chemical reactions that occur within the body’s cells
(digestive, respiratory, cardiovascular, endocrine)

Question 7

Excretion

Answer 7

Process of removing waste from the body
(digestive, urinary, respiratory)

Question 8

Reproduction

Answer 8

Process that occurs at the cellular level and organismal level

Question 9

Growth

Answer 9

An increase in size of a body part of the organism as a whole

Question 10

Physiology

Answer 10

Studies the function of the body; how the body works and carries out life-sustaining measures

Question 11

Anatomy

Answer 11

Studies the structure of the body parts and their relationship to one another

Question 12

What does the body need to maintain homeostasis?:

Answer 12

Nutrients, oxygen, water, maintain body temperature, atmospheric pressure, homeostasis

Question 13

Stimuli

Answer 13

A change in the body’s environment

Question 14

Receptor

Answer 14

Monitors the environment and responds to changes

Question 15

Control Center

Answer 15

Determines the set point, which is the level/range of which a variable is maintained; determines what response should be

Question 16

Input

Answer 16

Information sent by the receptor to the control center regarding the stimuli

Question 17

Effector

Answer 17

Allows for a carries out the control center’s response

Question 18

Afferent Path

Answer 18

Approaches control center via Receptor

Question 19

Efferent Path

Answer 19

Exits control center

Question 20

Negative Feedback

Answer 20

Output will shut off the original stimulus or reduce the intensity; continuous adjustments, maintain function
(blood sugar)

Question 21

Positive Feedback

Answer 21

Enhances the original stimulus so that the response is accelerated; often results in a “waterfall effect” until the events ends
(labor)