Biology 28.2 Mechanisms of Homeostasis Quiz

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25 Terms

1

the regulation and maintenance of the internal environment within the narrow ranges that support human life

homeostasis

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2

information from sensors that allows a control center to compare current conditions to set of ideal values

feedback

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3

a control system counteracts any changes in the body that moves conditions above or below a set point

negative feedback

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4

a control center uses information from sensors to increase the rate of change away from the set point

positive feedback

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5

What are the 4 parts that work together to form a system to maintain homeostasis

sensors, control center, communication system, and targets

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6

What is the other name for sensors

receptors

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7

What do sensors do

they gather information about conditions inside and outside of the body

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8

What does the control center do

receives information from the sensors and compares this information to the set points at which the body functions best

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9

What do the communication systems do

carry messages to all parts of the body

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10

What are the communication systems controlled by

the nervous system and the endocrine system

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11

What do targets do

any organ, tissue, or cell that changes its level of activity in response to a message

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12

What are the things that are controlled by homeostasis

temperature, pH levels, salt, nutrients, fluids, and gases

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13

What do internal systems do in homeostasis

respond quickly to change

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14

What range should body temperature be in

98.2-98.8

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15

What body temperatures is dangerous for the body and why

-106 degrees because it causes enzymes to stop functions

-below 80 degrees because it can cause heart failure

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16

What can happen if mineral levels are too low

irregular heartbeat

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17

What can happen if mineral levels are too high

coma

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18

What is a feedback loop

the information from one sensor allowing the control centre to compare current conditions to a set of ideal values

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19

What are the 2 types of FBLs

Negative feedback loops and positive feedback loops

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20

What does a negative feedback loop help do

keep the environment stable

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21

What are necessary for homeostasis

FBL

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22

most functions in the body are regulated by what

a negative FBL

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23

Which FBL is less common

positive FBL

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24

When are positive FBLs important

when rapid change is needed in the body

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25

What does the body need to change for

to accomplish a specific task

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